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1 WebSphere Application Server IBM IBM WebSphere Application Server Migration Toolkit Version 9.0 Release

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3 Contents Chapter 1. Overview Chapter 2. What's new Chapter 3. Support Chapter 4. Installing the migration tools 9 Chapter 5. Uninstalling the migration tools Chapter 6. Installing IBM WebSphere Application Server Developer Tools for Eclipse Chapter 7. Importing applications into the development environment Traditional Eclipse project organization Maven projects Chapter 8. Shared Java projects EAR-level library Web module library Chapter 9. Configuring a Java EE Runtime Library Chapter 10. Migrating an application to WebSphere Application Server Configuring the application migration tool for analysis Analyzing code for migration Rule Severity Displaying detailed help Application Technology Evaluation Report Running additional rules to optimize code quality 32 Chapter 11. Migrating Apache Tomcat configuration to Liberty Migrating Apache Tomcat server configuration.. 33 Migrating application configuration Completing the generated configuration Chapter 12. Troubleshooting Troubleshooting the application migration tools.. 41 Software Analyzer options not shown Java EE constructs or JSP not read correctly.. 41 Logging and trace Reports and history Markers Known issues Troubleshooting the configuration migration tool.. 45 Known issues Appendix A. Cloud migration rules.. 47 Appendix B. WebSphere version-to-version migration rules and quick fixes Java code review JSP code review XML code review File review Deprecated features Appendix C. Liberty migration rules.. 65 Rules for the Application Technology Evaluation Report Rules for migrating applications to Liberty Appendix D. Java EE version migration 73 Java EE 6 behavior differences Java EE 7 behavior differences Java EE 8 behavior differences Appendix E. Java SE version migration 77 J2SE 5.0 compatibility impacts Java SE 6 compatibility impacts Java SE 7 compatibility impacts Java SE 8 compatibility impacts Java SE 9 compatibility impacts Oracle to IBM compatibility impacts Sun internal APIs Appendix F. Third-party application server migration rules and quick fixes. 85 WebLogic Server rules and quick fixes WebLogic Server Java code review rules WebLogic Server JSP code review rules WebLogic Server XML file review rules WebLogic Server file review rules JBoss Application Server rules and quick fixes JBoss Java code review rules JBoss Application Server XML file review rules 94 JBoss Application Server file review rules Oracle Application Server rules and quick fixes.. 96 Oracle Application Server Java code review rules 97 Oracle Application Server JSP code review rules 97 Oracle Application Server XML file review rules 97 Oracle Application Server file review rules Apache Tomcat rules and quick fixes Apache Tomcat Java code review rules Apache Tomcat XML code review rules Other third-party server rules and quick fixes Common rules for all application servers Copyright IBM Corp. 2009, 2018 iii

4 Common rules for all application servers going to WebSphere traditional Common rules for competitive migration rule sets 102 Common rules for competitive migration going to WebSphere traditional rule sets Framework migration Framework XML - Spring best practices rules 104 Hibernate to WebSphere JPA migration Hibernate to WebSphere JPA - Java rules Hibernate to WebSphere JPA - XML rules Appendix G. Migrated Apache Tomcat configuration elements Configuration elements that are migrated from the conf/server.xml file Configuration elements that are migrated from the conf/context.xml file Configuration elements that are migrated from the conf/web.xml file Configuration elements that are migrated from tomcat-users elements Configuration elements that are migrated from the application META-INF/context.xml file Configuration elements that are migrated from the application WEB-INF/web.xml file Copyright and trademarks iv Application Migration Tools

5 Chapter 1. Overview The IBM WebSphere Application Server Migration Toolkit provides a rich set of tools that help you migrate applications from third-party application servers, between versions of WebSphere Application Server, to WebSphere Application Server Liberty, and to cloud platforms such as Liberty for Java on IBM Cloud. All of the Eclipse-based source scanning tools are combined into one update site where you can easily install the individual tools that you need. v Cloud Migration Tool v WebSphere Version to Version Application Migration Tool v Apache Tomcat to Liberty Configuration Migration Tool v Apache Tomcat to WebSphere Application Migration Tool v JBoss to WebSphere Application Migration Tool v Oracle to WebSphere Application Migration Tool v WebLogic to WebSphere Application Migration Tool This document explains how to install, configure, and use the migration tools. The application migration tools are based on IBM Rational Software Analyzer, which provides a single solution to identify, analyze, and optimize the application health. The tools use the scanning capabilities of Rational Software Analyzer to look for specific constructs unique to the particular application being migrated. The tools then provide a way to review and change that data so that the application can run on WebSphere Application Server. Cloud migration tool If you are moving an application to a cloud platform, the Cloud Migration Tool offers additional advice, suggestions, and best practices to ensure that the application runs correctly in those environments. You can use this tool in combination with the version-to-version tool and the third-party tools to help move your applications from WebSphere Application Server traditional or Liberty, Apache Tomcat Server, JBoss Application Server, Oracle Application Server, or Oracle WebLogic Server to cloud runtime environments such as IBM Cloud Runtimes (Cloud Foundry PaaS), IBM Cloud Kubernetes Service (Docker), WebSphere in IBM Cloud (virtual machines), and Liberty running on third-party PaaS runtime environments. WebSphere Version to Version Application Migration Tool The WebSphere Version to Version Application Migration Tool assists in migrating application source code from older versions of WebSphere Application Server to WebSphere Application Server Version and 9.0. It also helps you quickly and easily evaluate WebSphere Application Server traditional applications for their readiness to run on Liberty or Liberty Core in both cloud and on-premises environments. For information about how to generate this report, see Application Technology Evaluation Report on page 31. The overall application migration process between versions of WebSphere Application Server involves a series of steps: 1. Assess the migration 2. Plan the work needed to migrate Copyright IBM Corp. 2009,

6 3. Migrate and develop application code 4. Migrate the runtime configuration 5. Test applications with the new server configuration 6. Put the new server into production The tool analyzes your application source code and highlights Java Platform, Enterprise Edition (Java EE) programming model and WebSphere API differences between traditional WebSphere Application Server versions and between the traditional and Liberty servers. Based on this analysis, the tool offers advice and potential solutions to assess the ease of moving applications. It also informs you of Java EE specification implementation differences that could affect your applications. There are a number of issues that can affect code migration and development when moving between WebSphere Application Server releases. These issues include: v Changes to the Java Runtime Environment (JRE) encountered in Java SE 5, 6, 7 and 8 v Removal of previously deprecated features v Behavior changes in the product APIs v Changes resulting from Java EE specification clarifications v Deprecated features v WebSphere APIs not available on Liberty v Optional Java EE technologies not available on Liberty v Differences in technology implementations v Java EE 7 differences The tool supports migrating from the following versions: v WebSphere Application Server V5.1 v WebSphere Application Server V6.0 v WebSphere Application Server V6.1 v WebSphere Application Server V7.0 v WebSphere Application Server V8.0 v WebSphere Application Server traditional V8.5.5 v WebSphere Application Server traditional V9.0 v WebSphere Application Server Liberty v WebSphere Application Server Liberty Core The tool supports migrating to the following versions: v WebSphere Application Server traditional V8.5.5 v WebSphere Application Server traditional V9.0 v WebSphere Application Server Liberty v WebSphere Application Server Liberty Core Third-party application migration tools The application migration tools flag known differences between applications hosted on Oracle WebLogic Server, JBoss Application Server, Oracle Application Server, or Apache Tomcat and those hosted on WebSphere Application Server. In many cases, the tools can automatically convert the different parts to be compatible with WebSphere Application Server. If the tools cannot fix the difference, the file in question is flagged to identify where design changes are needed. The tools support: v Migrating applications to WebSphere Application Server Version or 9.0 v Migrating WebLogic Server Java, JSP, and class path artifacts (Java EE 5 and prior versions) 2 Application Migration Tools

7 v Migrating WebLogic Server deployment descriptors (Java EE 5 and prior versions) v Migrating JBoss Application Server Java and class path artifacts (Java EE 5 and prior versions) v Migrating JBoss Application Server deployment descriptors (Java EE 5 and prior versions) v Migrating Oracle Application Server Java and JSP artifacts (Java EE 5 and prior versions) v Migrating Oracle Application Server deployment descriptors (Java EE 5 and prior versions) v Migrating Apache Tomcat Java and JSP artifacts (Java EE 5 and prior versions) v Migrating Apache Tomcat Context XML information contained in the application v Migrating from Apache Tomcat 6.0 or 7.0 v Migrating from Java SE 1.4, 5, 6, or 7 to either Java 6, 7, or 8. Tomcat Configuration Migration Tool The Configuration Migration Tool helps you move server and application configuration to WebSphere Application Server Liberty by automatically migrating portions of the configuration. The tool supports: v Migrating from Apache Tomcat 6.0 or 7.0 v Migrating to Liberty v Migrating Apache Tomcat context, server, and web XML information contained in the server v Migrating Apache Tomcat context and web XML information contained in the application WebSphere Configuration Migration Tool The WebSphere Configuration Migration Tool (WCMT) is an Eclipse tool that reads the existing resources from your server configuration from WebSphere Application Server V7.0 or later, WebLogic, or JBoss and creates equivalent resources for WebSphere Application Server Liberty. It can optionally create a Jython script that you can use to create equivalent resources in traditional WebSphere Application Server. You can install WCMT from the migration toolkit online repository or download it separately from the WASdev website, WebSphere_Configuration_Migration_Tool. The WCMT tool is available in English only. Additional Resources With the Migration Toolkit for Application Binaries, you can produce migration reports from the command line using the application archives and class files without the need for source code. This tool highlights the Java SE differences, deprecations and removals, Java EE programming model differences, and WebSphere API differences between traditional WebSphere from V6.1 to V9.0 and between traditional WebSphere and Liberty servers. It also supports the cloud migration scenarios and includes a module-based cloud connectivity summary. The binary scan tool supports migrating from the following versions: v WebSphere Application Server V6.1 v WebSphere Application Server V7.0 v WebSphere Application Server V8.0 v WebSphere Application Server traditional V8.5.5 v WebSphere Application Server traditional V9.0 v WebSphere Application Server Liberty v WebSphere Application Server Liberty Core It supports migrating to the following versions: Chapter 1. Overview 3

8 v WebSphere Application Server traditional V8.5.5 v WebSphere Application Server traditional V9.0 v WebSphere Application Server Liberty v WebSphere Application Server Liberty Core Download the Migration Toolkit for Application Binaries from downloads/#asset/tools-migration_toolkit_for_application_binaries To estimate the effort required to move your applications from a third-party application server to WebSphere Application Server, try the Migration Discovery Tool at MigrationDiscovery. The WASdev Migration page provides an overview of all the tools, videos, and resource links. The WebSphere Migration Knowledge Collection: Planning and Resources provides information on all aspects of WebSphere Application Server migration. For comprehensive information on WebSphere Application Server migration topics, including examples of using the migration toolkit, see the WebSphere Application Server V8.5 Migration Guide. 4 Application Migration Tools

9 Chapter 2. What's new Java EE 8 behavior differences When moving from a Java EE 7 application server to Java EE 8 application server, you must consider application changes that are required because of specification clarification and implementation differences. This release includes more migration assistance for the following Java EE 8 technologies when moving to the Liberty Java EE 8 platform: v Bean Validation v Java API for RESTful Web Services (JAX-RS) v Java Server Faces (JSF) v Servlet A few new rules Rules were added to inform you of migration considerations related to: v The getrealpath method returns null for files that do not exist v Validate the result of concatenation with getrealpath("") v Validate the result of concatenation with getrealpath("/") v Check for new methods that were added to javax.servlet.servletoutputstream Support Bug and field support fixes were added to this release. Copyright IBM Corp. 2009,

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11 Chapter 3. Support Supported platforms The migration tools are supported on the following Eclipse-based platforms: v Eclipse Neon (4.6), Oxygen (4.7), and Photon (4.8) v Rational Application Developer versions 9.0 to 9.5 v Rational Software Architect versions 9.0 to 9.5 Cloud Migration Tool The cloud migration tool scans for known migration issues that you might encounter when you move applications to a cloud platform. For more information, see Appendix A, Cloud migration rules, on page 47. WebSphere Application Server Version Migration Tool The version-to-version migration tool scans for known issues in applications being migrated from WebSphere Application Server Version 5.1, 6.0, 6.1, 7.0, 8.0, or to WebSphere Application Server Version or 9.0. It also scans for known issues in applications being migrated from WebSphere Application Server traditional to Liberty. See the following sections for rules that support WebSphere version-to-version migration: v Appendix B, WebSphere version-to-version migration rules and quick fixes, on page 49 v Appendix C, Liberty migration rules, on page 65 v Appendix D, Java EE version migration, on page 73 v Appendix E, Java SE version migration, on page 77 Third-party migration tools The third-party application migration tools scan for known issues in applications that are migrated from WebLogic Server, Oracle Application Server, JBoss Application Server, or Apache Tomcat to WebSphere Application Server. Where possible, a quick fix is provided to change your code to a more portable solution. See the following sections for supported rules and quick fixes for your third-party application server: v WebLogic Server rules and quick fixes on page 85 v JBoss Application Server rules and quick fixes on page 93 v Oracle Application Server rules and quick fixes on page 96 v Apache Tomcat rules and quick fixes on page 99 You can use the quick fix preview support in the migration tools to help you decide if you want to accept the suggested code change. Also, view the help information provided with the rules to decide if you want to run the quick fix. Always make a backup copy of your source code before you start a migration. For some rules, the scan detects code that requires design changes and code rewrites. The tools highlight these problem areas but do not provide a quick fix. The Tomcat configuration migration tool migrates a subset of the server configuration and application configuration from Apache Tomcat to Liberty. For information about which configuration elements are migrated, see Appendix G, Migrated Apache Tomcat configuration elements, on page 109. Copyright IBM Corp. 2009,

12 Getting assistance The migration tools do not identify all problems. As you encounter issues that the tools do not handle, provide feedback through the IBM WebSphere Application Server Migration Toolkit forum, which is available at You can also use the forum to get answers to your questions about the tools. If you have access to IBM Passport Advantage, you can also open a customer problem report. As new rules and quick fixes are available, updates are made available on WASdev and Eclipse Marketplace. 8 Application Migration Tools

13 Chapter 4. Installing the migration tools The migration tools are Eclipse features that you install into an existing Eclipse or Rational integrated development environment (IDE). You can download Eclipse from Eclipse IDE for Java EE Developers is required for working with Java EE applications. You can install all features of the migration toolkit directly from Eclipse Marketplace or from the online repository. You can also manually download the repository archive. All options are described in the following steps: 1. Start the IDE. 2. Uninstall any previous version of the migration toolkit. 3. Verify that the prerequisite plug-ins are installed in your IDE. In Rational Application Developer, all prerequisite plug-ins are typically installed by default. In Rational Software Architect, the plug-ins are not enabled by default. Use IBM Installation Manager to verify that the Business Intelligence and Reporting Tools and the Web Developer Tools features are installed in your Rational product. If you are using an Eclipse environment, verify that the prerequisite plug-ins for your particular Eclipse version are installed. a. From the Eclipse menu bar, select Help > Install New Software. b. In the Work with field, enter the update site for your version of Eclipse: v v v Eclipse 4.8: Photon - Eclipse 4.7: Oxygen - Eclipse 4.6: Neon - c. Install the BIRT Framework listed in the Business Intelligence, Reporting and Charting feature. te: The catalog of available plug-ins is large and might require several minutes to download. If you are installing the migration tools on a machine that is not connected to the Internet, you can use a connected machine to download the migration toolkit and the Eclipse IDE for Java and Report Developers, which includes the BIRT framework. Download the Eclipse IDE for Java and Report Developers from: v v Eclipse 4.8: Photon - Eclipse 4.6: Neon - Extract Eclipse, start the IDE and then install the migration tools using the repository archive. If you are using Eclipse Oxygen, the Eclipse IDE for java and Report Developers package is not available and you must create an on-premises update site mirror to download the Eclipse plugins needed. 4. Install the migration tool features that you need. a. Access the migration tool software. You can install the tool directly from our online repository or from Eclipse Marketplace. Alternatively, you can manually download and install the repository archive. v To install from the online repository: 1) In your IDE, go to Help > Install New Software. 2) Click Add, and in the Add Repository window, enter the following information: Name: WebSphere Migration Toolkit Location: updates/wamt/migrationtoolkit/ Copyright IBM Corp. 2009,

14 v 3) Click OK. To install the tool from the Eclipse Marketplace: 1) Go to Help > Eclipse Marketplace. 2) Search for WebSphere migration. 3) Under IBM WebSphere Application Server Migration Toolkit, click Install. Figure 1. Accessing the migration tool software from Eclipse Marketplace v To install from the repository archive: 1) Download the latest version of the IBM WebSphere Application Server Migration Toolkit from the WASdev website, WebSphere_Application_Server_Migration_Toolkit. 2) In your IDE, go to Help > Install New Software. 3) Click Add, and in the Add Repository window, enter the following information: Name: WebSphere Migration Toolkit Location: Click Archive and browse to the repository archive that you downloaded. 4) Click OK. b. Expand IBM WebSphere Application Server Migration Toolkit, and select the migration tools that you need for cloud, version-to-version, or third-party application server migration. Ensure that Contact all update sites during install to find required software is selected, and click Next. 10 Application Migration Tools

15 Figure 2. Selecting migration toolkit features c. In the Install Details window, click Next. d. In the Review Licenses window, read the terms and accept any license agreements. Click Finish. The Installing Software window shows the installation progress. e. When the Software Updates window is displayed, click to restart the IDE. Chapter 4. Installing the migration tools 11

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17 Chapter 5. Uninstalling the migration tools You can remove installed Eclipse features, such as the migration tools, by using the Eclipse Installation Details window. 1. From the Eclipse menu bar, select Help > About Eclipse. 2. In the About Eclipse window, click Installation Details. 3. In the Eclipse Installation Details window, select the Installed Software tab. 4. Select the WebSphere Application Server migration toolkit feature that you want to uninstall, and click Uninstall. 5. In the Uninstall window, click Finish. Copyright IBM Corp. 2009,

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19 Chapter 6. Installing IBM WebSphere Application Server Developer Tools for Eclipse If you develop applications in the Eclipse IDE, you can use the IBM WebSphere Application Server Developer Tools in conjunction with the migration toolkit to migrate, develop, deploy, and test applications within a single IDE. Using the tools, you can also manage the server, publish your application to a local or remote server, and control incremental application publishing. Tools are available for both WebSphere Application Server traditional and Liberty. v IBM WebSphere Application Server Liberty Developer Tools v IBM WebSphere Application Server V9.0 Developer Tools v IBM WebSphere Application Server V8.5 Developer Tools The tools can be installed easily within Eclipse from Eclipse Marketplace, or you can download and install the tools from WASdev.net: 1. Start the Eclipse IDE. 2. To install the latest updates, go to Help > Check for Updates. 3. Access the development tool software. To install from Eclipse Marketplace: a. Click Help > Eclipse Marketplace. b. Search for WebSphere developer. c. In the list of results, locate the WebSphere Application Server Developer Tools for your version of WebSphere Application Server, and click Install. To download and install from WASdev.net: a. Download the latest version of WebSphere Application Server Developer Tools from WASdev.net. b. In your IDE, go to Help > Install New Software. c. Click Add, and in the Add Repository window, enter the following information: v v Name: WebSphere Developer Tools Location: Click Archive and browse to the archive file that you downloaded. d. Click OK. 4. In the Install Details window, click Next. 5. In the Review Licenses window, read the terms and accept any license agreements. Click Finish. The Installing Software window shows the installation progress. 6. When the Software Updates window is displayed, click to restart the IDE. For general discussion, demos, and information links, go to for more information. Copyright IBM Corp. 2009,

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21 Chapter 7. Importing applications into the development environment Traditional Eclipse project organization To analyze application source code for migration, the application must be imported into your Eclipse-based IDE. The application modules must be organized in projects that reflect their structure as EAR, web archive (WAR), and Enterprise JavaBeans (EJB) files. Specifically, some migration quick fixes that change web and EJB bindings and extensions only work when analyzing projects with the proper project facets to indicate they contain code for dynamic web modules and EJB modules. If your files are not already in Eclipse, you can either import your existing EAR, WAR, and EJB modules or manually create new projects in the workspace for each EAR, WAR module, and EJB module. You can use the Import Eclipse options to create the correct project structure. Rational Application Developer or the Eclipse for Java EE developer tools are needed to create these projects properly. For example, to import an EAR file, go to File > Import, select Java EE > EAR file. Enter the location of your EAR file. Eclipse creates a project for the EAR file and a project for each module in the application. Figure 3. Importing an EAR file By importing the application, the proper project structure is created with the deployment descriptor information. If your EAR file contains the Java source code, it is also imported into the Eclipse project. However, most EAR and module files do not contain source code, and you need to copy the source code to its correct source folders. Again, go to File > Import to import the source code from the file system or from an archive (.zip) file. Repeat this procedure to import the source code for each module. To create projects manually, go to File > New and select the appropriate project type: v EAR file: Enterprise Application Project v WAR file: Dynamic Web Project v EJB module: EJB Project To copy the source files to their correct locations in the project, go to File > Import. Review the following guidelines for structuring projects: v Place Java source code for a WAR file (for example, servlet, model, or utility classes) in the src folder of the project. The src folder is defined and can be changed in the Java Build Path properties for the Copyright IBM Corp. 2009,

22 project. If the Java source code needs to be referenced by more than one WAR file, see Shared Java projects for information on structuring the project files. v Place Java source code for an EJB module in the ejbmodule folder of the EJB project. v Place precompiled Java archive (JAR) libraries for a WAR file in the WebContent/WEB-INF/lib folder. v Place EAR-level JAR libraries in the EarContent folder of the enterprise application project. If your project contains an APP-INF/lib folder, place the folder in the EarContent folder; however, you must run the class path rule and its quick fix to update the class paths correctly. For a more detailed description of how to import applications into your IDE, see the WebSphere Application Server V8.5 Migration Guide ( Maven projects To effectively analyze an application that uses Maven, install the latest M2Eclipse (m2e) in your Eclipse environment. WebSphere Developer Tools (WDT) and Rational Application Developer include m2e in the installation package. For some of the migration quick fixes to run correctly, the appropriate facets need to be set on the projects. For example, a web project requires the dynamic web module facet, and an EJB project requires the EJB module facet. Any newly created project in an IDE with m2e installed is automatically created with the appropriate facets when the proper archetype is chosen. When you import Maven projects that were not created in an environment with m2e, check the project to see whether the appropriate facets are set. To verify the facets, right-click on the project and navigate to Properties > Project Facet. You might run into a window with a similar message to Figure 4. Figure 4. Convert to facet Select the Convert to facet form option to go to the correct project facet view. Select the correct facet for web projects and EJB projects. 18 Application Migration Tools

23 Chapter 8. Shared Java projects There are two options for referencing shared Java classes from a web project: 1. Create a single copy of the Java project JAR file in the EAR file. Each WAR file references the JAR file. This approach reduces the size of the EAR file. 2. Create a copy of the JAR file in each WAR file. Use this approach if only one WAR file references the JAR file. For more information on configuring the deployment assembly, see the Java EE Deployment Assembly document on IBM developerworks. EAR-level library Complete the following steps to place Java source files in a separate project: 1. Create a new Java project and add the Java source code into the src folder of the project. 2. Right-click the project in the Project view and select Properties. 3. Select the Deployment Assembly item from the left pane. On the right pane, click Add to include the Java projects you want to reference. Figure 5. Java EE EAR module dependencies 4. Click OK to save your changes. Web module library To create a copy of the JAR file in each WAR file, complete the following steps: 1. Right-click the project in the Project view and select Properties. 2. Select the Deployment Assembly item from the left pane to view the Web Deployment Assembly. On the right pane, click Add to include the Java projects or archives you want to reference. 3. Click OK to save your changes. Copyright IBM Corp. 2009,

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25 Chapter 9. Configuring a Java EE Runtime Library If you are using Eclipse with the Java EE tools installed, the Java compiler is not able to resolve references to the Java EE APIs unless a target Java EE runtime environment is configured. Follow these steps to configure the Java EE Runtime Library: 1. To open the Eclipse preferences, go to Window > Preferences. 2. Navigate to the Server > Runtime Environments item on the left pane. Figure 6. Server Runtime Environments pane 3. Click Add. Select IBM and the appropriate WebSphere Application Server for the target application server. The choices available depend on the WebSphere Developer Tools or Rational Application Developer features you have installed. 4. On the next wizard pages, configure your installed server location or install a new Liberty server. 5. Alternatively, click Add. Select Basic > J2EE Runtime Library. 6. On the next wizard page, click Browse to choose the library location, locate the dev/javaee folder of your WebSphere Application Server installation, and select the appropriate Java EE version. That folder contains the j2ee.jar file with the Java EE APIs. To use this runtime library in a web or EJB project when you have the IBM WebSphere Application Server Developer Tools installed, target the WebSphere Application Server traditional or Liberty server. If WebSphere Application Server Developer Tools are not installed, you can set the library as a targeted runtime in the project properties. In the Project view, right-click the project, and select Properties. Select Copyright IBM Corp. 2009,

26 Targeted Runtimes, then select the recently configured Java EE runtime library, and click OK. Figure 7. Targeted Runtimes 22 Application Migration Tools

27 Chapter 10. Migrating an application to WebSphere Application Server Configuring the application migration tool for analysis You can configure the tool to define a set of rules to run and define the scope of analysis within the workspace. The scope can be a project, a working set, or the entire workspace. After you define the scope, you can save the analysis configuration to use or modify later. With an application migration tool installed, you have new analysis options to configure and run an analysis. To configure the analysis, complete the following steps: 1. Open the analysis configuration options. You can access the configuration options in the following locations within Eclipse: v In the main Eclipse menu bar, go to Run > Analysis. v In the Launch toolbar, click the Software Analyzer icon ( ) and select Software Analyzer Configurations. v In the Explorer view, right-click your project and select Software Analyzer > Software Analyzer Configurations. If you do not see Software Analyzer options, see Software Analyzer options not shown on page 41. You can add or remove analysis configurations by using the icons in the window. Figure 8. Creating a Software Analyzer configuration 2. In the configurations list, select Software Analyzer. Then, click New. The right side of the window changes to show the basic configuration interface. Copyright IBM Corp. 2009,

28 Figure 9. Setting up the configuration 3. In the Software Analyzer Configurations window, enter a name for the configuration, such as AppMigration. 4. On the Scope tab, select Analyze entire workspace to scan all projects in the workspace. You can limit the scope of an analysis by using the other options to analyze a working set or a selection of projects. Tip: When you run your analysis from the Explorer view, the scope of the analysis is limited to the node in the project where the menu item was selected. This allows you to perform a quick analysis on a limited set of code. 5. On the Rules tab, select the type of analysis to perform using the Rule Sets list. You can also select individual rules to run. Tip: To obtain additional information about a rule, highlight the rule and press. Help for the rule is shown in the configuration window. The initial help page includes a short description and a link to more information. 24 Application Migration Tools

29 Figure 10. Selecting rules Depending on which features you installed, you see one or more migration-related rule sets: v Cloud Application Migration v WebSphere Application Server Version Migration v WebLogic Application Migration v JBoss Application Migration v Oracle Application Migration v Apache Tomcat Application Migration v Other third-party servers The application migration tools have rules under the following analysis providers: v File Review v Java Code Review v JSP Code Review v XML File Review After you select a rule set, click Set to select the applicable application migration rules. Chapter 10. Migrating an application to WebSphere Application Server 25

30 Figure 11. Configuring a rule set Select the source and target settings for your environment: Source application server The source application server indicates the application server that you are migrating your application from. The source application server, either WebSphere Application Server or a third-party application server, affects the rules selected. When using the WebSphere version-to-version rule set or the cloud migration rule set, you can choose the source application server. For rule sets for third-party application servers, the source application server is preselected and cannot be changed. Target application server The target application server indicates the application server that you are migrating to. You can migrate to a specific version of WebSphere Application Server traditional, Liberty, or Liberty Core. Target Java EE version When migrating to WebSphere Application Server Liberty, you can also select the target Java Platform, Enterprise Edition (Java EE) version that you plan to use for the application. If you move to the latest Java EE level on Liberty or traditional WebSphere Application Server V9.0, you might experience different behaviors. The Java EE rules help you understand these differences and how they will affect your application. The rules can help you move from Java EE 6 to Java EE 7 on either WebSphere Application Server traditional or Liberty. It can also help you move from Java EE 6 or Java EE 7 to Java EE 8 on WebSphere Liberty. If you are already on Liberty Java EE 6 or Java EE 7, you can stay on your current Java EE level with zero migration. For Liberty, choose only the technologies that you are using. For example, if you do not use the CDI feature, do not select CDI. For both Liberty and traditional WebSphere, choose only the technologies that you must migrate. Some technologies, such as JPA and JAX-RS, do not require moving to the latest Java EE level. Consider keeping existing JPA applications running on the Java EE 6 JPA 2.0 feature based on OpenJPA, and use JPA 2.1 based on EclipseLink for new applications. Target cloud runtime The target cloud runtime indicates the cloud platform that you are migrating to. You can choose a cloud runtime environment to evaluate if your target application server is WebSphere Application Server traditional V8.5.5 or V9.0, Liberty, or Liberty Core. Source Java version The source Java version indicates the Java Platform, Standard Edition (Java SE) version that your application server currently uses. 26 Application Migration Tools

31 Target Java version The target Java version indicates the Java SE version that your target application server will use. If the source and target Java versions are different, migration rules are automatically selected. te: The number of rules in the analysis configuration options varies depending on the platform on which the tool is installed. Analysis rules are available in several Rational products such as Rational Application Developer; therefore, the included rule sets might be different. 6. To save the rule configuration, click Apply. 7. In the Software Analysis Configurations window, you can select or clear any rule or group of rules to use in the analysis. For example, if you find after analysis that you do not need to make changes pointed out by a particular rule from the selected rule set, you can clear its selection to turn it off. a. To find the rule, the navigation in the configuration window is similar to the folders shown in the results tree view. Use the folder names to locate the rule. b. Clear the rule selection. c. Click Apply. The deselected rule will not be included in the next analysis. Some rules have additional configuration options. When a rule with configuration options is selected, the rule properties are shown in the Properties tab under the list of rules. The following figure shows the rule properties for a web services rule. If you do not update the properties, the rule uses the default values. Figure 12. Rule properties Analyzing code for migration Run the analysis and display the results. Chapter 10. Migrating an application to WebSphere Application Server 27

32 To start the analysis, click Analyze in the Software Analyzer Configuration window. The results are displayed in the Software Analysis Results view. Figure 13. Java Code Review results view The content of the results view varies depending on which rules you are running. The results generated by an application migration tool are displayed in one of the following tabs: v File Review v Java Code Review v JSP Code Review v XML File Review If no results are shown in the panel, no issues were identified while scanning. Right-click individual results to show the available options such as viewing the source code where the problem occurred or correcting the problem with a provided fix. 28 Application Migration Tools

33 Figure 14. Result options with Quick Fix Preview and Help t all rules have all actions available, but the possible actions include: v View Result - Opens an editor showing the source file that triggered the rule. The cause of the problem is highlighted, and a rule violation icon is shown in the left margin of the editor. v Quick Fix - The light bulb overlay on the result list icon ( ) indicates that this rule has a quick fix. Selecting this option runs the conversion that modifies the affected Java code, XML file, JSP or manifest file, allowing it to run in WebSphere Application Server. The quick fix might change the code directly or it might present the steps needed to complete the fix. v Quick Fix Preview - This option is available for the rules that support showing a side-by-side comparison of the original code and the code after the quick fix is applied. This option allows you to see the changes before they are made. Some quick fixes modify more than one file. When you select Quick Fix Preview for a fix affecting multiple files, the files are shown in the Structure Compare portion of the Compare view. Double-click each file to view the differences. Chapter 10. Migrating an application to WebSphere Application Server 29

34 Figure 15. Previewing quick fixes for multiple files v v v Ignore Result - This option removes the rule from the list without making a code change. For Java and XML files, a comment annotation is added to the file so that the rule is not triggered on future analysis runs. Quick Fix All - This option resolves all issues identified for a given rule. Quick Fix All Category - This option runs all quick fixes identified for the category to which the rule belongs. A rule must have Quick Fix All enabled for the Quick Fix All Category option to run its quick fix. For example, if you choose this option on a Java rule, the quick fixes for all Java rules that have the Quick Fix All option are run. Rule Severity The rule severity helps identify the impact of an issue on your application migration. Rule severity Source scanner icon Binary scanner icon Description Severe Severe rules indicate an API removal or behavior change that can break the application and must be addressed. Warning Warning rules indicate behavior changes that might break the application and should be evaluated. Information Information rules indicate the use of deprecated APIs or minor behavior changes that will not affect most applications. Displaying detailed help Context-sensitive help is displayed in the Help view as you select each result. The first panel is a short description. Click Detailed help to get more information. To open the Help view if it is not already displayed: On Windows: v Press F1 On Linux: v Press Shift-F1 30 Application Migration Tools

35 On Mac: v From the rule set dialog window, select the in lower left corner. v From the results view, select Window > Show View > Other... > Help > OK Application Technology Evaluation Report With any of the migration tools installed, you can generate a report that helps to evaluate the Java technologies that are used by your application. The report gives a high-level review of the programming models found in the application and the WebSphere products that support these programming models. To generate the report: 1. Click Run > Generate Application Technology Evaluation Report. 2. Select the projects that you want to evaluate. 3. Select the WebSphere products you want to compare. 4. Click OK. Figure 16. Application Technology Evaluation Report The rows in the report vary depending on the application. Chapter 10. Migrating an application to WebSphere Application Server 31

36 Running additional rules to optimize code quality After you successfully migrate your application, Rational Software Analyzer provides additional rules that can help improve the quality of your code. Figure 17 shows examples of the additional rules. Figure 17. Other architectural and Java rules Access these rules by creating a new analysis configuration or modifying an existing one. These rules are not automatically selected as part of rule sets for the application migration tools. When the selected rules are run and necessary changes are made, the updated application must be exported and tested on WebSphere Application Server. If you use Rational Application Developer, tools are available to create deployments and test the application within the Rational Application Developer environment. Some users have found the Avoid using com.ibm.ws.* package rule in the Java Code Review > Private API > WebSphere category helpful during migration analysis. The com.ibm.ws.* package contains application-server-internal APIs that are not for application use and are subject to change. If you know your application uses private APIs or if you are not sure, you can use this rule to check your application. If you have generated code related to EJBs or web services, you might get false hits on this rule. 32 Application Migration Tools

37 Chapter 11. Migrating Apache Tomcat configuration to Liberty Migrating Apache Tomcat server configuration Begin your configuration migration process by migrating the Apache Tomcat server configuration. Before you run the configuration migration tool, the Liberty server must already exist in Eclipse. To create a Liberty server in Eclipse, you must use the WebSphere Application Server Liberty Developer Tools. For more information, see Chapter 6, Installing IBM WebSphere Application Server Developer Tools for Eclipse, on page 15 To migrate the server configuration, complete the following steps: 1. Start the migration tool. You can start the migration tool from the following locations within Eclipse: v v v In the Eclipse menu bar, go to Run > Tomcat Configuration Migration. Browse to the location of the Tomcat server installation, and click OK. In the Explorer view, right-click your Tomcat server and select Migrate Tomcat Configuration. In the Servers view, right-click your Tomcat server and select Migrate Tomcat Configuration. 2. Select the Liberty server that you want to migrate to. Click OK to begin migrating the configuration. 3. After the configuration is migrated, you are notified that the migration completed successfully and whether further action is required. Select whether you want to open the updated Liberty server configuration and the server migration log file, and click OK. The Liberty server workspace refreshes. The selected Liberty server now contains the updated configuration. The server.xml file contains an include of the migratedconfig/server-updates-for-config.xml file. The updated configuration includes the following files: File name server.xml migratedconfig/configmigration.log migratedconfig/context.xml migratedconfig/server.xml Description Liberty server configuration file that was updated to include the generated configuration file, migratedconfig/serverupdates-for-config.xml Information on the migration Configuration from the Tomcat context.xml file Configuration from the Tomcat server.xml file Copyright IBM Corp. 2009,

38 File name migratedconfig/server.xml.original.txt migratedconfig/server-updates-for-config.xml migratedconfig/shared-libraries.xml migratedconfig/shared-libraries.xml.original.txt migratedconfig/variables.xml migratedconfig/variables.xml.original.txt migratedconfig/[tomcat-users-file]_users-and-roles.xml Description Copy of the original Liberty server.xml file before the migration High-level include file Shared library configuration for reference by Liberty datasource elements and the classloader element on the application element Copy of the original shared-libraries.xml file before the migration. This copy is made only if the file existed and was modified during the migration. Configuration from the Tomcat catalina.properties file Copy of the original variables.xml file before the migration. This copy is made only if the file existed and was modified during the migration. Configuration from the Tomcat tomcat-users.xml file or a user-defined file with tomcat-users elements. The Liberty file name is created based on the Tomcat file name. Migrating application configuration After you migrate the Apache Tomcat server configuration, you can migrate the application configuration. Before you run the configuration migration tool, the application WAR file must be imported into Eclipse, and the application source, which can include Java source code, JavaServer Pages (JSP), and deployment descriptors, must be migrated using the Apache Tomcat to WebSphere Application Migration Tool. For information about configuring and running the application migration tool, see Configuring the application migration tool for analysis on page 23 and Analyzing code for migration on page 27. To migrate the application configuration, complete the following steps: 1. In the Explorer view, right-click the project, and select Migrate Tomcat Configuration. 2. Select the WebSphere Application Server Liberty server that you want to migrate to, and click OK to begin migrating the configuration. 3. If you are migrating an application before you migrated the corresponding Tomcat server, you can choose to migrate a server before you continue to migrate the application. Select whether you want to migrate a Tomcat server, and click OK. To stop migrating the application, click Cancel. 34 Application Migration Tools

39 4. After the configuration is migrated, you are notified that the migration completed successfully and whether further action is required. Select whether you want to open the updated Liberty server configuration and the application migration log file, and click OK. The Liberty server workspace refreshes. The selected Liberty server now contains the updated configuration. The server.xml file contains an include of the server-updates-for-application.xml file. The updated configuration includes the following files: File name server.xml migratedconfig/[application-name]/configmigration.log Liberty server configuration file that was updated to include the generated configuration file, migratedconfig/ [application-name]/server-updates-forapplication.xml migratedconfig/[application-name]/application-configcontext.xml migratedconfig/[application-name]/application-config-web.xml migratedconfig/[application-name]/ibm-web-bnd.xml.original.txt Description Information on the migration Configuration from the application META-INF/context.xml file Configuration from the application WEB-INF/web.xml file Copy of the original application WEB-INF/ibm-web-bnd.xml file before the migration. This copy is made only if the file existed and was modified during the migration. Chapter 11. Migrating Apache Tomcat configuration to Liberty 35

40 File name migratedconfig/[application-name]/server.xml.original.txt migratedconfig/[application-name]/server-updates-forapplication-config.xml migratedconfig/shared-libraries.xml migratedconfig/shared-libraries.xml.original.txt migratedconfig/variables.xml migratedconfig/variables.xml.original.txt Description Copy of the original Liberty server.xml file before the migration High-level include file Shared library configuration for reference by Liberty datasource elements and the classloader element on the application element Copy of the original shared-libraries.xml file before the migration. This copy is made only if the file existed and was modified during the migration. Configuration from the Tomcat catalina.properties file Copy of the original variables.xml file before the migration. This copy is made only if the file existed and was modified during the migration. Completing the generated configuration After the tool migrates the Apache Tomcat server and application configuration to WebSphere Application Server Liberty, you might need to take further action to complete the generated configuration. Whether further action is required is noted in the dialog box that opens when the configuration is migrated successfully and in the migration log file, configmigration.log. The migration log includes the following entries that detail what you must do to complete your configuration: v ** Action required: These log entries denote elements that must be configured further. v ** Attention: These log entries denote elements that were not migrated or that behave differently in Liberty compared to Tomcat. You must evaluate whether further actions are necessary to complete the configuration. The configmigration.log file is located in the migratedconfig directory for a migrated server and in the migratedconfig/[application-name] directory for a migrated application. The following sections contain information on elements that require additional action: Migrating JMS Resource elements for Apache ActiveMQ To support the migration of JMS applications, Tomcat Resource elements related to Apache ActiveMQ are migrated to the embedded Liberty messaging features and related configuration elements in the Liberty server. The applications must use JMS interfaces to function properly when configured to use the Liberty embedded messaging engine. Migrating JMS Resource elements for WebSphere MQ Tomcat Resource elements related to WebSphere MQ are migrated to Liberty WebSphere MQ configuration elements. To connect to WebSphere MQ from Liberty, you must use the WebSphere MQ resource adapter, which must be installed separately. For more information about installing the WebSphere MQ resource adapter for WebSphere Application Server Liberty, see support/docview.wss?uid=swg Application Migration Tools

41 The location of the WebSphere MQ resource adapter is specified in the generated configuration by the wmqjmsclient.rar.location variable. The default location is ${shared.resource.dir}/wmq/wmq.jmsra.rar. Copy the files to the specified location, or modify the wmqjmsclient.rar.location variable to reference the location of the WebSphere MQ resource adapter files. To allow JMS applications to connect to WebSphere MQ in BINDING mode or by using the shared memories, you must have both the Liberty server and WebSphere MQ deployed on the same server. To allow JMS applications to connect in BINDING mode, you must also manually specify the location of the WebSphere MQ native libraries in the generated configuration on the nativelibrarypath attribute of the wmqjmsclient element. Migrating applications that use MongoDB Although Tomcat applications that use MongoDB do not need to reference the MongoDB Java driver, Liberty applications that use the MongoDB Java driver as a shared library require a library reference to the driver. To support the migration of applications that use MongoDB and reference it as a shared library, the migration tool generates shared library configuration and specifies the location of the MongoDB Java driver on the library element. The default location of the driver is ${shared.resource.dir}/mongo-java-driver-*.jar. The migration tool attempts to copy the required driver file from the Tomcat server runtime directory that was used in the most recent Tomcat server configuration migration to the location specified on the library element. The Tomcat server runtime directory is saved in the migratedconfig/server-updatesfor-config.xml file in the tomcatserverruntimedirectory variable. If tomcatserverruntimedirectory is not specified, the migration tool attempts to copy the required file from the location specified by the CATALINA_HOME system environment variable. If the required driver file is not found, an ** Action required: entry is logged. You must copy the file to the specified location or modify the library element to reference the location of the driver. Migrating database Resource elements To support the migration of applications that use databases, Tomcat Resource elements that are related to IBM DB2, Apache Derby, Oracle Database, Sybase ASE, Microsoft SQL Server, and MySQL are migrated to datasource configuration elements in the Liberty server. The generated configuration looks for certain files in the location specified by the ${shared.resource.dir} property. Applications that use MongoDB also generate a library configuration element. The migration tool attempts to copy the required files from the Tomcat server runtime directory that was used in the most recent Tomcat server configuration migration to the location specified by the ${shared.resource.dir} property. The Tomcat server runtime directory is saved in the migratedconfig/server-updates-for-config.xml file in the tomcatserverruntimedirectory variable. If tomcatserverruntimedirectory is not specified, the migration tool attempts to copy the required files from the location specified by the CATALINA_HOME system environment variable. If the required driver files are not found, an ** Action required: entry is logged. You must copy the files to the specified location or modify the generated configuration to reference the location of the files. The files for each database type are listed in the following table. Database Apache Derby IBM DB2 Expected files in the location specified by the ${shared.resource.dir} property derby.jar db2jcc4.jar and either db2jcc_license_cisuz.jar or db2jcc_license_cu.jar Chapter 11. Migrating Apache Tomcat configuration to Liberty 37

42 Database Oracle Database, Thin driver Oracle Database, OCI driver Sybase ASE, JDBC3 driver Sybase ASE, JDBC4 driver Microsoft SQL Server, Microsoft JDBC driver Microsoft SQL Server, Progress DataDirect driver MySQL Server MongoDB, Java driver Expected files in the location specified by the ${shared.resource.dir} property ojdbc6.jar All contents of the Oracle Database client directory jconn3.jar jconn4.jar sqljdbc4.jar sqlserver.jar mysql-connector-java-version.jar, where version is the version of the MySQL JDBC driver mongo-java-driver-version.jar, where version is the version of MongoDB Java driver te: If the Oracle OCI driver is present in the Tomcat source configuration, the generated library configuration is not contained within the JDBC driver configuration as it is for the other databases. The library for the OCI driver must be shared across all applications. Therefore, the library is generated in a separate include file, migratedconfig/shared-libraries.xml. The ID of the library is then referenced on the libraryref attribute of the jdbcdriver element. Because the migration tool cannot determine the location of the Oracle Database client directory, the required files are not copied during the migration process. Migrating tomcat-users elements The following configuration files that contain tomcat-users elements are migrated: v Files that are referenced by the pathname attribute of a MemoryRealm element v Files that are referenced by the pathname attribute of a Resource element that uses the MemoryUserDatabaseFactory factory attribute and is referenced by a UserDatabaseRealm Realm element v The conf/tomcat-users.xml file if a previously described MemoryRealm element or Resource element does not define a pathname attribute A file that is referenced in the pathname attribute can be relative to the Tomcat server directory or an absolute file name. Because more than one realm can be configured, multiple configuration files that contain tomcat-users elements could be migrated. To avoid file name conflicts in the migrated files, the generated Liberty file name is derived from the Tomcat configuration file name and directory. For example, conf/tomcat-users.xml is migrated to migratedconfig/conf_tomcat-users_users-androles.xml. Migrating application security-role elements In Tomcat, the meaning of security-constraint/auth-constraint/role-name elements that are set to * is defined by the value of the allrolesmode attribute on either the UserDatabaseRealm configuration or the MemoryRealm configuration. The allrolesmode attribute can have the following values: v allrolesmode="strict" - All defined security-role elements from the application web.xml file are migrated to the Liberty application-bnd security-role and group elements. v allrolesmode="authonly" - A Liberty application-bnd element is created with a security-role element that defines a special-subject element with the type attribute set to ALL_AUTHENTICATED_USERS. v allrolesmode="strictauthonly" - If the security-role elements are defined in the application web.xml file, the values are migrated as they are in strict mode. If no roles are defined, the migration proceeds as for the authonly mode. 38 Application Migration Tools

43 If the allrolesmode attribute is not defined, the default value is strict. If multiple realms define different allrolesmode values, the most flexible value is migrated, according to the following order: authonly, then strictauthonly, then strict. Migrating SSL-enabled connectors All supported SSL connectors are migrated to equivalent httpendpoint elements. Supported protocol types are "HTTP1.1", "org.apache.coyote.http11.http11protocol", "org.apache.coyote.http11.http11nioprotocol", or no specified protocol, which is the default value. Connectors that use other protocol types are not migrated. Connectors that redirect to SSL-enabled connectors are associated together on the httpport and httpsport attributes of the httpendpoint elements. Keystore and truststore passwords are encoded during migration. If a port redirects to an SSL-enabled connector that does not exist or is an unsupported protocol, the httpsport attribute is set to -1, which disables the port. Multiple ports cannot redirect to the same SSL-enabled port on Liberty. If this configuration is detected, the migration tool associates only the first httpendpoint with the SSL-enabled port and sets the httpsport attribute to -1 on the remaining httpendpoint elements that are generated. If the Tomcat connector requires security but does not provide keystore information, the migration tool generates the default SSL configuration supported by Liberty. Migrating variables The migration tool migrates variables that are referenced in the Tomcat configuration to the Liberty server configuration. Variable definitions in the Tomcat catalina.properties file are migrated to the migratedconfig/variables.xml file by default. If a variable is not defined in the catalina.properties file or as a system property, an ** Action required: entry is logged. Configure the variable in the Liberty server, or modify the configuration to not reference the variable. WebSphere Application Server Liberty does not support variable names that contain the string "${". If a variable name contains this string, an ** Action required: entry is logged. Configure a variable with a valid name, or modify the configuration to not reference the variable. If a variable has a value that contains the name of another variable, the Liberty server interprets the value differently than Tomcat. The Liberty server interprets the value as referencing another variable, whereas the Tomcat server interprets the value as a literal string. If a variable has a value that the Liberty server might interpret as a variable reference, an ** Action required: entry is logged. Configure a variable without a variable reference in its value, or modify the configuration to not reference the variable. Configuring a virtual-host element for an application To bind an application on a Liberty server to a particular virtual host, the application ibm-web-bnd.xml file must contain a virtual-host element. The value of the virtual-host name attribute must be the value of a virtualhost id attribute that is configured in the Liberty server in the migratedconfig/server.xml file. You can select a virtual host for your application when you migrate the application. Chapter 11. Migrating Apache Tomcat configuration to Liberty 39

44 40 Application Migration Tools

45 Chapter 12. Troubleshooting Troubleshooting the application migration tools Software Analyzer options not shown Installing an application migration tool creates a Software Analyzer menu and toolbar options in the Java, Debug, Plug-in Development, and C++ perspectives. When you use other perspectives, you must enable these options manually by completing the following steps: 1. From your perspective, select Window > Customize Perspective from the IDE menu. 2. In the Customize Perspective window, click the Commands tab and select Software Analyzer. 3. Click OK. Figure 18. Software Analyzer availability Java EE constructs or JSP not read correctly For the tools to read project files correctly, the projects must be set up with their appropriate project facets. For example, projects that contain enterprise beans must have the EJB Module facet. You can see facets for a project by right-clicking the project in the project explorer and selecting Properties. Select the Project Facets property. Projects containing web modules must be dynamic web projects. See Chapter 7, Importing applications into the development environment, on page 17 for more information. Logging and trace The application migration tools write error information to two log files: v The workspace log (workspace/.metadata/.log) contains messages logged by the application migration tools and messages logged by Rational Software Analyzer. v The service logs for the application migration tools are located in the workspace/.metadata/.plugins/ com.ibm.ws.appconversion.base directory. These logs contain all error information. If trace is enabled, the logs also contain detailed trace information. Enable trace in the migration tools by setting the appconversion.trace system variable on the command line to launch the IDE or in the eclipse.ini properties file; for example: Copyright IBM Corp. 2009,

46 v v Command-line option. Add the system variable to the command line that starts Eclipse: eclipse.exe -vmargs -Dappconversion.trace=true eclipse.ini option. Add the following option to the eclipse.ini file found in the same directory as the eclipse.exe file: -Dappconversion.trace=true Reports and history In the Software Analyzer Results window, you can export a history of each analysis provider for the selected analysis run. Export the history as XML data or generate a formatted HTML or PDF file by clicking on the respective icons in the upper-right corner of the analysis provider tab. Generated PDF reports are saved in the workspace/.metadata/.plugins/ com.ibm.xtools.analysis.reporting/reports directory. Markers Markers are displayed in the left margin of Eclipse editors and provide information about the content of the editor on the line where the marker is displayed. Editors for different file types can have different behaviors for the markers, some of which are described here. Figure 19. Analysis rule markers in a Java editor pop-up window displays when you click the marker This issue affects non-java based rules. For a Java rule, clicking the marker allows the quick fix to be performed. However, clicking the marker for the XML rule has no action, and hovering over the marker only displays the help text. Use the Software Analyzer Results view to select the Quick Fix action in non-java files. Double-clicking a marker removes the marker Double-clicking the marker in the file editor removes the marker without applying the quick fix. If this happens, run the analysis again to flag the problem again. Cannot select multiple markers on the same line When there are multiple markers on the same line of text, you cannot toggle between the different markers. You must carry out the action of the first marker to select successive markers. To apply a quick fix in such a case, use the Software Analyzer Results view to select the Quick Fix action you want, rather than relying on the marker. Known issues Quick Fix for a WebLogic rule corrupts the ejb-jar.xml file If you are using Eclipse 4.3 or later without the WebSphere Application Server Developer Tools installed, namespace attributes in the ejb-jar.xml file are corrupted when you use the Quick Fix option for the WebLogic rule Do not use local JNDI names. This rule is found on the XML File Review tab under WebLogic To WebSphere deployment descriptor migration in the Software Analyzer Results view. When this issue occurs, you will see the following message in the Markers tab under XML Problems: Attribute "xmlns" was already specified for element "ejb-jar". If you run analysis again, you will see the following message in the error log: 42 Application Migration Tools

47 The ejb-jar.xml file in the weblogicapp project cannot be analyzed because of the following XML parsing exception: org.xml.sax.saxparseexception: Attribute "xmlns" bound to namespace " was already specified for element "ejb-jar". The Quick Fix erroneously duplicates the xmlns attribute and changes the value of the xmlns:ejb attribute as shown in the following example. Namespace attributes before you run the Quick Fix: xmlns:xsi=" xmlns=" xmlns:ejb=" xsi:schemalocation=" id="ejb-jar_id" version="3.0" Namespace attributes after you run the Quick Fix: xmlns:xsi=" xmlns=" xmlns:ejb=" xmlns=" xsi:schemalocation=" id="ejb-jar_id" version="3.0" To resolve the parsing errors, manually edit the ejb-jar.xml file and fix the namespace attributes. For information about installing the developer tools so that this issue does not occur, see Chapter 6, Installing IBM WebSphere Application Server Developer Tools for Eclipse, on page 15. Quick Fix All Category When you use the Quick Fix All Category option, let it run to completion before running it on another rule provider. Also, do not run Quick Fix All Category again on the same provider where it is already running. Wait until it completes. If you notice errors being logged when running the Quick Fix All Category option, there are a few things you can do in Eclipse to mitigate issues: v In Window > Preferences > General > Editors, select Close editors automatically and set a value for Number of open editors before closing. The default value is 8, but you can limit it further. v Choose Run in Background to prevent all the editors from opening and possibly running out of window handles. v Disable the automatic build feature of Eclipse (Project > Build Automatically) while running Quick Fix All Category. Manually build the projects, and enable the option again after running Quick Fix All Category. Process all rules of a category before running analysis again. Some rules are interrelated, and you might improve results if you run related quick fixes before running the analysis again. For example, the triggers for the WebLogic Server logging rules are related, and you will need to apply all quick fixes related to logging to make sure that the changes can compile successfully. Multiple rules on the same node When multiple rules are flagged on the same node, only the first quick fix applied runs correctly. You might need to run the analysis multiple times to make sure that all code is fixed and processed correctly. Chapter 12. Troubleshooting 43

48 Viewing external links from help in Linux Many detailed help pages have external references to information applicable to the specific rule. This information is best viewed from an external browser rather than the Eclipse help view. On Windows platforms, help automatically launches these external references in the default browser. On Linux operating systems, it displays the information in the Eclipse help view. To manually open help in an external browser, use the Show in external window icon ( ) on the detailed help page. The detailed help for some cloud migration rules contain links to IBM Cloud support pages that might return 500 internal server error when rendered in a Linux Eclipse help window. This technique to view external links in a browser can be used to workaround this problem. Ignore Results If you select Ignore Results on a line of code that is the beginning of a block of Java code with nested results that are flagged for the same rule, the nested results line numbers are set to zero. You can rerun the analysis to see the proper line numbers. Examples of statements that cause this issue are method declarations and if statements. View Results for.xmi files If you select View Results for an.xmi file and get an error when you open the file, add an.xmi file association. Go to Window > Preferences > General > Editors > File Associations, click Add, and enter *.xmi. Select either XML Editor or Text Editor, and click Default. Click OK to save. Rational Application Developer installation dependency conflicts If an application migration tool installation fails with a conflicting dependency error, you might need to remove the Rational Application Developer Code Analysis or Code Review feature. The feature name depends on your Rational product version. The following message is an example of a code dependency error: Cannot complete the install because of a conflicting dependency. Software being installed: Application Migration Tool - WebSphere Version to Version com.ibm.ws.appconversion_feature.was2was.feature.group ) Software currently installed: Shared profile (SharedProfile_bootProfile ) Only one of the following plugins can be installed at once: Analysis History Data Source ODA Runtime Driver v _2203 (com.ibm.rsar.analysis.reporting.oda v _2203) Analysis History Data Source ODA Runtime Driver (com.ibm.rsar.analysis.reporting.oda ) To uninstall the Rational Application Developer Code Analysis or Code Review feature, start IBM Installation Manager, and select the Modify option. Select your Rational Application Developer installation from the Modify Packages list. Click Next, and clear Code Analysis selection from the list of features. Click Next, and verify that Code Analysis is in the list of features to be removed. Proceed with the removal of the feature. After Installation Manager completes, install the toolkit again. Java Code Review Severity Summary HTML report in Windows does not display The Java Code Review Severity Summary HTML report in Windows does not display in the Eclipse HTML viewer unless you use Internet Explorer 9, which supports SVG image files. You can work around this problem in the following ways: v Produce a PDF file instead of an HTML file. v Produce an HTML file, right-click the view to Create Shortcut, then open the shortcut using a browser that supports SVG files on Windows, such as Mozilla Firefox. 44 Application Migration Tools

49 Rule selection does not display correctly in Linux If you are using Eclipse 4.4 or later on Linux, selecting a rule set in the Software Analyzer Configurations selects the appropriate rules, but the selection indicator before the category names does not display correctly under the Analysis Domains and Rules panel. However, the number of rules selected is indicated correctly after each category name. In versions of Eclipse prior to 4.4, a check mark indicates that all rules in a category are selected, and a minus sign indicates that some of the rules in a category are selected. In Eclipse 4.4 or later, the indicator on the category might be blank, even though some or all the rules within that category are selected. The analysis is not affected. Troubleshooting the configuration migration tool servers are listed in the Liberty Server Selection window The list of servers in the Liberty Server Selection window is populated with WebSphere Application Server Liberty servers found in the Servers view of Eclipse. If no Liberty servers are present, no servers are listed. Cancel the migration, add a Liberty server to Eclipse, and start the migration again. servers are listed in the Tomcat Server Selection window The list of servers in the Tomcat Server Selection window is populated with Tomcat servers found in the Servers view of Eclipse. If no Tomcat servers are present, no servers are listed. In the Tomcat Server Selection window, click Cancel to return to the Dependencies on the Tomcat Configuration window. In the drop-down list you can choose to migrate a Tomcat server from the file system or migrate only the application. Alternatively, click Cancel to cancel the application migration, then add a Tomcat server to Eclipse and start the application migration again. The application receives a SQLException The generated data source configuration looks for the necessary database JAR files in the location specified by ${shared.resource.dir}. Copy the relevant JAR files to the specified location, or change the datasource configuration element in the Liberty server to reference the location of the JAR files. A JMS Application receives a NamingException caused by a ClasstFoundException The location of the WebSphere MQ resource adapter is specified in the generated configuration by the wmqjmsclient.rar.location variable. The default location is ${shared.resource.dir}/wmq/wmq.jmsra.rar. Copy the files to the specified location, or modify the wmqjmsclient.rar.location variable to reference the location of the WebSphere MQ resource adapter files. A JMS Application receives a DetailedJMSException caused by an UnsatisfiedLinkError The generated configuration for a JMS application that connects to WebSphere MQ in BINDING mode must be updated manually to reference the location of the WebSphere MQ native libraries. Specify the location of the libraries on the nativelibrarypath attribute of the wmqjmsclient element. The application receives a message that the authentication did not succeed The user elements in the Tomcat server configuration contained encrypted passwords, so the passwords could not be hash encoded during migration. Use the Liberty Configuration Editor to change and hash encode the password attributes in the migrated configuration to the original unencrypted values from the Tomcat server. Chapter 12. Troubleshooting 45

50 There are multiple available UserRegistry implementation services After you migrate the Tomcat configuration, if you see the CWWKS3006E error message when you start the Liberty server, there might be one or more basicregistry elements with differing id attribute values. CWWKS3006E: A configuration exception has occurred. There are multiple available UserRegistry implementation services; the system cannot determine which to use. All migrated basicregistry elements are created with the id attribute value set to migrateduserregistry. If there are one or more existing basicregistry elements with different id values or with no id attribute, ensure that all basicregistry elements have an id attribute set to the same value. Known issues A User Input Required window opens when you migrate application configuration When you migrate application configuration, a User Input Required window opens that states that application publishing requires the applicationmonitor updatetrigger attribute to be set to mbean in the server configuration file. The prompt asks if you want to set the attribute in the server configuration. You can safely select because the migration tool adds the necessary settings to the generated configuration. The hostalias element receives an XML Problem warning After you migrate server configuration, the Markers pane might contain one or more XML Problem warnings about hostalias elements, which are child elements of the virtualhost element. The warning states: cvc-complex-type.2.4.d: Invalid content was found starting with element hostalias. child element is expected at this point. server.xml The hostalias element was introduced in WebSphere Application Server Liberty V Previous versions of the Liberty server ignore hostalias elements, and you can ignore the warning. An application that runs on Liberty V does not persist session information in Mozilla Firefox After you migrate configuration for applications that require multiple cookies to Liberty V , session information might be lost when you use the application in Mozilla Firefox. When the session information is lost, the values are set to null and Firefox displays an error message. This problem occurs because Firefox and the Liberty server use the same cookie names for the application. To resolve the problem, add the cookiename="jessionsid2" attribute to the httpsession element in the Liberty migratedconfig/context.xml file. 46 Application Migration Tools

51 Appendix A. Cloud migration rules The Cloud Migration Tool identifies application issues to consider when you move an application to cloud platforms such as IBM Cloud Runtimes (Cloud Foundry PaaS), Third-party PaaS (CF, OSE, etc.), Docker (IBM Cloud Kubernetes Service), and WebSphere in IBM Cloud (Virtual Machines). Liberty for Java on IBM Cloud The following rules are relevant only when migrating applications to Liberty for Java on IBM Cloud. v An extreme Scale distributed in-memory cache is available v Optimized Java Runtime Environment v Remote interfaces for Enterprise JavaBeans (EJB) are unavailable Liberty on IBM Cloud Runtimes or third-party platforms (PaaS) The following rules are relevant when migrating applications to Liberty for Java on IBM Cloud or to WebSphere Application Server Liberty on third-party cloud platform as a service (PaaS) environments v Avoid creating new process instances v Avoid writing to the local file system v Capture log information v Client certificate authentication is not available v Do not use older or non-standard protocols v HTTP session persistence v Listening for inbound connections v Stopping the Liberty server v Two-phase commit transactions Liberty on third-party platforms (PaaS) The following rule is relevant when migrating applications to WebSphere Application Server Liberty on third-party cloud platform as a service (PaaS) offerings. v Transport security is terminated at the router Copyright IBM Corp. 2009,

52 Connectivity considerations for IBM Cloud The connectivity rules evaluate your application's use of the following resources that might have connectivity considerations when moving applications to the cloud. These rules are flagged only once per Eclipse project (or Java archive) to indicate the individual technologies that are used. v Databases v Enterprise Information Systems (EIS) v Java EE security v JavaMail server v Java Message Service (JMS) v Message-Driven Beans (MDB) v Remote EJB lookups v Remote EJB providers v Remote web services v Third-party security v Vendor specific messaging The following rule flags all URLs that might be affected by cloud migration: v Validate the URL host and port for cloud access Docker (IBM Cloud Kubernetes Service) The following rule is relevant when migrating applications to WebSphere Application Server traditional or Liberty on Docker (IBM Cloud Kubernetes Service). v Handling application configuration in Docker containers v Managing data inside and between Docker containers 48 Application Migration Tools

53 Appendix B. WebSphere version-to-version migration rules and quick fixes The WebSphere Version to Version Application Migration Tool feature evaluates Java code, JSP code and deployment descriptors as part of its analysis set. This section provides specific details on the rules and quick fixes that are provided. WebSphere Application Server conversion rules are included in the following analysis domains: Figure 20. Analysis domains When you select the WebSphere Application Server Version Migration rule set, rules common to all application servers and relevant WebSphere version migration rules will be selected. The common rules for all application servers are described in Common rules for all application servers on page 102. Java code review Under the Java Code Review set of rules, the WebSphere version migration category contains rules for migrating from WebSphere Application Server Version 5.1, 6.0, 6.1, 7.0, 8.0, and to Version 8.0, 8.5.5, or 9.0. To learn how to get more information about a rule, see Displaying detailed help on page 30. Quick fixes are available where possible. Rules without quick fixes flag the rule violations so you can evaluate their usage and migrate the code manually. Table 1. V5.1 to V6.0 migration Check for a behavior change on the ServletResponse default content type Check for behavior change on URLs containing a plus sign Check for expected behavior on ServletResponse sendredirect() method Use leading slash on ServletContext getresource() and getresourceasstream() requests The default content type for HttpServletResponse has changed from "text/html" to "text/plain" for servlets that do not set the content type. This rule flags calls in Java code that create Uniform Resource Locators (URL) that contain a plus ("+") character in the URI that is not part of the query parameters. The plus ("+") is only reserved in the query string portion of the URL. The WebSphere Application Server implementation of the ServletResponse sendredirect() method omits path information until the last slash. With a new custom property this behavior can be corrected. This rule flags calls to the ServletContext.getResource() and ServletContext.getResourceAsStream() methods where it cannot easily be determined if the String value passed on the method contains a leading slash (/) as required by the servlet specification. Copyright IBM Corp. 2009,

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