G l a r i m y Training on. Spring Framework

Transcription

1 Training on Spring Framework Krishna Mohan Koyya Technology Consultant & Corporate Trainer [Visit the portal for latest version of this presentation]

2 Krishna Mohan Koyya Call me Krishna Originally from Tadepalligudem in Andhra Pradesh Have been in Bengaluru for the last 10 years Held various positions in the IT Industry Worked on development of huge systems Extensive work in the areas of Object Orientation Distributed Systems Network Management Systems Java Technologies

3 Academics & Career Graduation B.E. in Electronics & Communication Engineering SRKR Engineering College, Bhimavaram, affiliated to Andhra University, Visakhapatnam Post Graduation M.Tech in Computer Science & Technology College of Engineering, Andhra University, Visakhapatnam Career (13 years) Consultant at Hewlett-Packard Project Leader at Wipro Technologies Grade 10 Engineer at Cisco Systems CEO at Sudhari IT Solutions India Pvt Limited Associate Professor at Sasi Institute of Tech & Engg Corporate Trainer & Technology Consultant

4 Corporate Trainings Pune Hyderabad Bangalore Mysore Chennai

5 Software Requirements Spring Framework Spring Spring WebFlow Spring Security Java, IDE & Build Tools JDK 1.6 Apache Ant 1.7 Eclipse 3.4 Webserver Apache Tomcat 5.0 Database MySQL 5 Messaging System Apache ActiveMQ

6 Environment Setup Install Java Define JAVA_HOME pointing to jdk1.6.0_14 Update PATH to include JAVA_HOME/bin Install Ant Update PATH to include C:\Program Files\apache-ant-1.7.1/bin Install Tomcat Define TOMCAT_HOME pointing to apache-tomcat Create a folder projects Install Eclipse Run eclipse.exe in its bin folder Choose projects as the workspace Choose J2EE Perspective Add Apache Tomcat v6.0 Server to the server list Start tomcat server and check homepage at Install Active MQ Run activemq.bat under its bin folder Check homepage at

7 Environment Setup Install MySQL Set root password to admin and eave all default values in the install wizard Run net start MySQL from command line Run Start->All Programs->MySQL->MySQL Server 5.0->MySQL Command Line Client Run the following SQL queries to create the database create database glarimy; use glarimy; create table directory (name varchar(32) primary key, city varchar(32) not null, age city);

8 Environment Setup Create a folder spring and unzip the following there spring-framework zip spring-webflow release.zip spring-security zip mysql-connector-java bin.zip Define SPRING_HOME pointing to spring-framework Copy the following to TOMCAT_HOME/server/lib commons-logging.jar spring.jar standard.jar jstl.jar spring-webmvc.jar mysql-connector-java bin

9 Spring Open Source Created by Rod Johnson Framework Consists of several modules For Enterprise Application Development Container For light weight dependency injection Aspect Oriented

10 Spring Modules Core Basis for the spring framework Provides BeanFactory for Dependency Injection Application Context Extends BeanFactory The Spring Framework with lifecycle events, validation and integration AOP Basis for developing Aspects DAO JDBC based database connectivity Supports transaction management and handling of DB exceptions ORM Provides hooks for integrating ORM solutions JCA Connectivity to EIS, Legacy systems and etc.,

11 Spring Modules JMX Exposes application beans as JMX Beans JMS Publishes and consumes JMS messages to/from Queues and Topics Remoting Exposes Java Beans as Remote Objects MVC Model View Controller implementation for Web Applications Portlet MVC Based on Spring MVC to support portal development

12 Dependency Injection Application in Control Beans depends on other beans Beans discover the depending beans Tight Coupling Inversion of Control Beans depend on other beans Beans are injected with the depending beans Loose Coupling Injection Methods Constructor Injection Property Injection Interface Injection Method Injection

13 Bean Factory XML configuration file XMLBean Factory Classpath Resource Retrieves configuration file from classpath FileSystem Resource Retrieves configuration file from file system InputStream Resource Retrieves configuration file from the stream ServletContext Resource Retrieves configuration file from the servlet context UrlResource Resource Retrieves configuration file from the URL

14 Bean Lifecycle At the beginning Instantiate Populate Properties SetBeanName Only for BeanNameAware implementations SetBeanFactory Only for BeanFactoryAware implementations Pre-Initialization BeanPostProcessors AfterPropertiesSet Only for InitializingBean implementations Custom init method Post-initialization BeanPostProcessors At the end Destroy Only for DisposableBean implementations Custom destroy method

15 Application Context XML configuration file ApplicationContext ClassPathXmlApplicationContext Loads context from the XML file within the classpath FileSystemXmlApplicationContext Loads context from the XML file within the file system XmlWebApplicationContext Loads context from the XML file within the web application

16 Bean Lifecycle At the beginning Instantiate Populate Properties SetBeanName Only for BeanNameAware implementations SetBeanFactory Only for BeanFactoryAware implementations SetApplicationContext Only for ApplicationContextAware implementations Pre-Initialization BeanPostProcessors AfterPropertiesSet Only for InitializingBean implementations Custom init method Post-initialization BeanPostProcessors At the end Destroy Only for DisposableBean implementations Custom destroy method

17 Bean Wiring Wiring simple values Integers, float values, strings, boolean values Wiring other beans References to other beans Wiring collections Maps, Sets, Lists and Properties Wiring null values Auto Wiring By Name By Type By Constructor By Auto-detection

18 Bean Configuration Factory Methods Controlling bean creation Configuring init-method Any method of a bean Default Init Method Applies to all beans Implementing InitializingBean interface Method: afterpropertiesset Controlling bean tear-down Configuring destroy Method Any method of a bean Default Destroy Method Applies to all beans Implementing DisposableBean interface Method: Destroy

19 Bean Configuration: Scope Standalone Application Singleton Default Bean can be created only one per container Prototype Bean can be created any number of times Web Applications Request Bean is created for each HTTP Request Session Bean is created only once for each session Portals Global Session Bean is created only one for the global HTTP Session

20 Bean Configuration: Inheritance Parent Bean Holds common properties and values Associated with a Class Can be created Can be inherited by any other child beans Abstract Parent Bean Holds common properties and values Not associated with any class Can not be created Can be inherited by any other child beans Child Beans Can inherit properties from other parent beans Can override the values of inherited properties

21 Aspect Oriented Programming Complements OOP Avoids code-clutter Clear-cut development roles Easy decoration Aspect or Advisor or Interceptor Deals with cross cutting concerns Secondary requirements span across classes Combination of point-cut and advice Advice: Additional code to be applied to the module Point-cut: Point where cross-cutting concern applies Weaving Applying advices to the targets and creating proxies Weaving Methods Compile Time weaving Load Time Weaving Run Time Weaving

22 Spring AOP Run Time Weaving Supports only method point-cuts Client interacts with the Target through Proxy ProxyFactoryBean ProxyFactoryBean is assigned with an ID (Ex: pid) The Target is assigned with an ID (Ex: tid) The ProxyFactoryBean is wired with the Target Client loads the bean with pid assuming it is the Target Advices are Java classes only No special language or compiler is needed Choice of implementing various interfaces Before - MethodBeforeAdvice After-Returning AfterReturningAdvice Throwing ThrowsAdvice Around MethodInterceptor Defining Point-cuts Regular Expressions AspectJ Pointcuts

23 Spring AOP Auto Proxying Only ApplicationContext supports it Proxy gets created automatically Target is assigned with an ID (Ex: tid) Clients load the bean with the same ID Two Methods of Autoproxying DefaultAdvisorAutoProxyCreator Creates Proxy for the Targets that matches any advisors BeanNameAutoProxyCreator Creates Proxy for the named Targets POJOs as Aspects <aop:aspectj-autoproxy /> Using AspectJ Using XML configuration <aop:aspect>, <aop:pointcut> <aop:before>, <aop:after-returning>, <aop:after-throwing>, <aop:around>

24 Persistence in Spring Uses JDBC Supports connection pools Supports JNDI lookup Supports ORM and other API Supports Hibernate, Toplink, IBatis, JPA and etc Supports Transactions Supports JTA Injection of data sources Loose coupling between application & persistence Follows DAO pattern Templates Obviates boilerplate code DAO Support Classes Further simplifies the persistence Unchecked Exceptions Meaningful exceptions Handful of utlities RowMapper and ParameterizedRowMapper

25 Unchecked Exceptions CannotAcquireLockException CannotSerializeTransactionException CleanupFailureDataAccessException ConcurrencyFailureException DataAccessException DataAccessResourceFailureException DataIntegrityViolationException DataRetrievalFailureException DeadlockLoserDataAccessException EmptyResultDataAccessException IncorrectResultSizeDataAccessException IncorrectUpdateSemanticsDataAccessException InvalidDataAccessApiUsageException InvalidDataAccessResourceUsageException OptimisticLockingFailureException PermissionDeniedDataAccessException PessimisticLockingFailureException TypeMismatchDataAccessException UncategorizedDataAccessException

26 Templates JDBC Templates jdbc.core.jdbctemplate JDBC connections jdbc.core.namedparam.namedparameterjdbctemplate JDBC connections with support for named parameters jdbc.core.simple.simplejdbctemplate JDBC connections, simplified with Java 5 constructs ORM and other Templates orm.hibernate.hibernatetemplate Hibernate 2.x sessions orm.hibernate3.hibernatetemplate Hibernate 3.x sessions orm.jpa.jpatemplate Java Persistence API entity managers orm.toplink.toplinktemplate Oracle s TopLink orm.jdo.jdotemplate Java Data Object implementations

27 DAO Support Classes JDBC Support Classes jdbc.core.support.jdbcdaosupport JDBC connections jdbc.core.namedparam.namedparameterjdbcdaosupport JDBC connections with support for named parameters jdbc.core.simple.simplejdbcdaosupport JDBC connections, simplified with Java 5 constructs ORM Support Classes jca.cci.support.ccidaosupport JCA CCI connections orm.hibernate.support.hibernatedao Support Hibernate 2.x sessions orm.hibernate3.support.hibernatedao Support Hibernate 3.x sessions orm.jdo.support.jdodaosupport Java Data Object implementations orm.jpa.support.jpadaosupport Java Persistence API entity Managers

28 Transaction Managers For JDBC and ibatis jdbc.datasource.datasourcetransactionmanager For distributed transactions transaction.jta.jtatransactionmanager For Hibernate orm.hibernate.hibernatetransactionmanager orm.hibernate3.hibernatetransactionmanager For JDO for persistence. orm.jdo.jdotransactionmanager For JPA. orm.jpa.jpatransactionmanager For Toplink orm.toplink.toplinktransactionmanager

29 Programmatic Transactions Full control on transactions Granular level Templates TransactionTemplate Execute() Callbacks TransactionCallBack interface dointransaction() TransactionStatus

30 Declarative Transactions Transactions as Aspects Transaction Annotations Transaction Attributes Propagation Isolation Read-Only TimeOut RollbackRules

31 Declarative Transactions Propagation PROPAGATION_MANDATORY PROPAGATION_NESTED PROPAGATION_REQUIRED PROPAGATION_NEVER PROPAGATION_NOT_SUPPORTED PROPAGATION_REQUIRED PROPAGATION_REQUIRES_NEW PROPAGATION_SUPPORTS Isolation Levels ISOLATION_DEFAULT ISOLATION_READ_UNCOMMITTED ISOLATION_READ_COMMITTED ISOLATION_REPEATABLE_READ ISOLATION_SERIALIZABLE

32 Spring MVC MVC Framework for Web Applications Dispatcher Servlet at the center Front Controller and Dispatcher Application Context from XML files Controllers Interfaces the webapp with the biz logic Views User Interface Elements View Resolvers Connects Models with the Views Model Data meant for the Views

33 Spring MVC: Collaboration Browser sends HTTP Request Web Server checks the URL pattern Passes it to the Dispatcher Servlet, if matches Dispatcher maps the controller Dispatcher looks into the context file Identifies and maps to the configured controller Passes the HTTP Request to the controller Controller processes the request Controller returns ModelAndView Dispatcher Resolves the View Takes help of the ViewResolver Finds the View View Gets Rendered

34 Spring MVC: Collaboration Mapping Controllers BeanNameUrlHandlerMapping Maps Based on the controller s bean name SimpleUrlHandlerMapping Based on property collection in the application context. ControllerClassNameHandlerMapping Based on the class name of the Controller CommonsPathMapHandlerMapping Based on the Commons attributes Multiple Mapping Strategies

35 Spring MVC: Controllers View ParameterizableViewController UrlFilenameViewController Simple Controller AbstractController Throwaway ThrowawayController Multiaction MultiActionController Command BaseCommandController AbstractCommandController Form AbstractFormController SimpleFormController Wizard AbstractWizardFormController

36 Spring MVC: Validation Validator Interface Validate Does the validation Supports Checks if it can validate the object of this class Validation Framework Integrates with Commons Validator Configuration in the Context File

37 Spring MVC: View Resolvers Different View Resolvers InternalResourceViewResolver BeanNameViewResolver ResourceBundleViewResolver XmlViewResolver Multiple View Resolvers in application Order

38 Final Note about the Preso This is just a presentation and no way replaces the class room training, discussion and illustrations. Best out of this presentation can be obtained by working on the accompanied sample mini projects, simultaneously. For any questions, mail me to krishna@glarimy.com

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