S Cove pring Bootrs Pivotal Certified Spring Enterprise Integration Specialist Exam SOURCE CODE ONLINE

Transcription

1 Covers Spring Boot

2 Pivotal Certified Spring Enterprise Integration Specialist Exam A Study Guide Lubos Krnac

3 Pivotal Certified Spring Enterprise Integration Specialist Exam Copyright 2015 by Lubos Krnac This work is subject to copyright. All rights are reserved by the Publisher, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microfilms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed. Exempted from this legal reservation are brief excerpts in connection with reviews or scholarly analysis or material supplied specifically for the purpose of being entered and executed on a computer system, for exclusive use by the purchaser of the work. Duplication of this publication or parts thereof is permitted only under the provisions of the Copyright Law of the Publisher's location, in its current version, and permission for use must always be obtained from Springer. Permissions for use may be obtained through RightsLink at the Copyright Clearance Center. Violations are liable to prosecution under the respective Copyright Law. ISBN-13 (pbk): ISBN-13 (electronic): Trademarked names, logos, and images may appear in this book. Rather than use a trademark symbol with every occurrence of a trademarked name, logo, or image, we use the names, logos, and images only in an editorial fashion and to the benefit of the trademark owner, with no intention of infringement of the trademark. The use in this publication of trade names, trademarks, service marks, and similar terms, even if they are not identified as such, is not to be taken as an expression of opinion as to whether or not they are subject to proprietary rights. While the advice and information in this book are believed to be true and accurate at the date of publication, neither the authors nor the editors nor the publisher can accept any legal responsibility for any errors or omissions that may be made. The publisher makes no warranty, express or implied, with respect to the material contained herein. Managing Director: Welmoed Spahr Lead Editor: Steve Anglin Technical Reviewer: Manuel Jordan Elera Editorial Board: Steve Anglin, Louise Corrigan, Jonathan Gennick, Robert Hutchinson, Michelle Lowman, James Markham, Susan McDermott, Matthew Moodie, Jeffrey Pepper, Douglas Pundick, Ben Renow-Clarke, Gwenan Spearing Coordinating Editor: Mark Powers Copy Editor: Sharon Wilkey Compositor: SPi Global Indexer: SPi Global Artist: SPi Global Cover Designer: Anna Ishchenko Distributed to the book trade worldwide by Springer Science+Business Media New York, 233 Spring Street, 6th Floor, New York, NY Phone SPRINGER, fax (201) , orders-ny@springer-sbm.com, or visit Apress Media LLC is a California LLC and the sole member (owner) is Springer Science+Business Media Finance Inc. (SSBM Finance Inc.). SSBM Finance Inc. is a Delaware corporation. For information on translations, please rights@apress.com, or visit Apress and friends of ED books may be purchased in bulk for academic, corporate, or promotional use. ebook versions and licenses are also available for most titles. For more information, reference our Special Bulk Sales ebook Licensing web page at Any source code or other supplementary materials referenced by the author in this text is available to readers at For detailed information about how to locate your book s source code, go to Readers can also access source code at SpringerLink in the Supplementary Material section for each chapter.

4 Contents at a Glance About the Author...xv About the Technical Reviewer...xvii Acknowledgments...xix Introduction...xxi Chapter 1: Tasks and Scheduling... 1 Chapter 2: Remoting Chapter 3: Web Services Chapter 4: RESTful Web Services Chapter 5: Java Message Service Chapter 6: JMS Transactions Chapter 7: Distributed Transactions Chapter 8: Spring Integration Chapter 9: Spring Batch Index iii

5 Contents About the Author...xv About the Technical Reviewer...xvii Acknowledgments...xix Introduction...xxi Chapter 1: Tasks and Scheduling... 1 Multithreading in Java... 2 Java SE... 2 Java EE... 9 Task Scheduling Multithreading with Spring org.springframework.core.task.taskexecutor org.springframework.scheduling.trigger Task Scheduler Configuring Asynchronous Tasks Configuring Scheduled Tasks Summary Chapter 2: Remoting Remote Method Invocation Spring RMI Support Spring RMI Summary v

6 Spring HttpInvoker HttpInvoker Served via HttpRequestHandlerServlet HttpInvoker Served via DispatcherServlet HttpInvoker Served via Simple Java HTTP Server HttpInvoker Service Accessed from Client Summary Chapter 3: Web Services Introduction to Web Services Java Web Services Spring Web Services Contract Creation Endpoint Mapping JAXB 2 Endpoint-Mapping Example Spring Context Configuration Transports HTTP/HTTPS JMS XMPP Servlet Transports Web Service Client Intercepting Messages Server-Side Interception Client-Side Interception Error Handling Server-Side Error Handling Client-Side Error Handling Out-of-Container Testing Server-Side Testing Support Client-Side Testing Support Summary vi

7 Chapter 4: RESTful Web Services REST Principles Client/Server Separation CRUD Operations Uniform Interface Statelessness Layered Architecture HATEOAS Cacheability Flexibility HTTP Overview HTTP Methods Used by REST JAX-RS JAX-RS Implementations JAX-RS API Common Classes Used in Examples JAX-RS Endpoint Spring MVC Configuring Spring MVC for REST Spring MVC Mappings Lower-level Abstraction Injection String MVC CRUD Example... Example Spring MVC REST with Headers and Query Parameters Testing Spring MVC REST APIs perform andexpect andreturn anddo vii

8 MockMvc Instance Creation MockMvc Integration Test Example MockMvc Unit Test Example Consuming REST Custom Error Handler Client-Side Testing Consuming REST Asynchronously Summary Chapter 5: Java Message Service JMS Standard Overview Java JMS API JMS Message JMS Infrastructure Abstractions Java JMS Examples Synchronous JMS 1.1 Example Synchronous JMS 2.0 Example Asynchronous JMS Example Spring JMS Configuring Spring JMS Caching JMS Resources Using JmsTemplate Using the MessageCreator Callback Listening to JMS Messages Converting JMS Messages Using the Publish/Subscribe JMS Model Integrating JMS with Higher-Level Messaging Abstractions Summary viii

9 Chapter 6: JMS Transactions JMS Reliability Mechanisms Java JMS Transaction Examples Common Classes for Spring JMS Examples AUTO_ACKNOWLEDGE Mode Success Scenario Lost Message with Listener Lost Message with Synchronous Reception CLIENT_ACKNOWLEDGE Mode Success Scenario Duplicate Message Scenario DUPS_OK_ACKNOWLEDGE Mode Local JMS Transactions with Spring Success Scenario Duplicate Message Scenario JmsTransactionManager Handling Duplicates Summary Chapter 7: Distributed Transactions Understanding Distributed Transactions Cons of Distributed Transactions Distributed Transactions with Spring Common Classes for JTA Examples Spring JTA Example with XML Configuration Spring JTA Example with Java Configuration Spring Boot JTA Example Summary ix

10 Chapter 8: Spring Integration x Spring Integration Introduction Spring Integration s Main Concepts Common Classes Used in SI Examples Message Programmatic Creation of Messages Parsing Message Headers Message Endpoint Message Endpoint Types List of Message Endpoints Channel Adapter Service Activator Messaging Gateway Transformer Content Enricher Filter Router Bridge Chain Splitter Aggregator Message Channel DirectChannel QueueChannel PriorityChannel RendezvousChannel ExecutorChannel PublishSubscribeChannel NullChannel Channel Interceptor Wire Tap

11 Error Handling Custom Class in Error-Handling Examples Synchronous Error Propagation Example Asynchronous Bidirectional Flow Asynchronous Unidirectional Flow Global Error Handler Overriding Custom Error Channel Example Transaction Handling Transaction Propagation Example Transacted Polling Example MessagingTemplate MessagingTemplate Example Summary Chapter 9: Spring Batch Spring Batch Domain Chunk-Oriented Processing Common Classes for Chunk-Oriented Processing Examples Chunk-Oriented Processing Example with XML Configuration Chunk-Oriented Processing Example with Java Configuration Example with File Reader and JDBC Writer Tasklet Step Common Classes for Tasklet Examples Tasklet Step Example with XML Configuration Tasklet Step Example with Java Configuration JobLauncher JobLauncher Example with XML Configuration JobLauncher Example with Java Configuration Asynchronous JobLauncher Example xi

12 JobParameters CommandLineJobRunner Execute Thin JAR from the Command Line Execute Fat Spring Boot JAR from the Command Line Execute XML Job from the Command Line Execute Job with Parameters from the Command Line JobRepository Configuring JobRepository with XML Configuration Configuring JobRepository with Java Configuration Stateful Job and Step Execution ExecutionContext Batch Scopes Batch-Processing Listeners XML Configuration of Job Interception Example Java Configuration of Job Interception Example XML Configuration of Step Interception Example Java Configuration of Step Interception example XML Configuration of Chunk-Oriented Processing Listeners Java Configuration of Chunk-Oriented Processing Listeners ItemStream XML Example of ItemStream Usage Java Configuration Example of ItemStream Usage Job and Step Inheritance Configuring Restart XML Configuration Example of Step Restart Java Configuration Example of Step Restart Control Repeat of Step Execution Reacting to Failures XML Configuration of Skip and SkipListener Java Configuration of Skip and SkipListener xii

13 XML Configuration of Retry Java Configuration of Retry Conditional Execution of Step XML Configuration of Step Decision Java Configuration of Step Decision Scaling and Parallel Processing Multithreaded Step Parallel Steps Remote Chunking of Step Partitioning a Step Spring Batch Admin Summary Index xiii

14 About the Author I started my career as an embedded software developer, and these capabilities were also the focus of my studies. But soon I changed to Java and Spring development. I worked hard for nearly seven years on web and enterprise projects of various sizes and domains. I gained Spring Enterprise Integration Specialist certification in I am naturally amazed by the Spring ecosystem; reinventing the wheel is not an option for me. A huge passion of mine is automation and testing. I am lazy and strongly believe that developers shouldn t be doing repetitive tasks. That is why the examples for this book ( lkrnac/book-eiws-code-samples) are all covered by tests. One of the reasons that Spring is my framework of choice is its testability. I write blog posts on my site, that are often republished on DZone, Java Code Geeks, and Web Code Geeks. I am also interested in modern JavaScript development: ES6, Node.js, Grunt, Gulp, LoopBack, and AngularJS. My Twitter handle and my address is lubos.krnac@gmail.com. xv

15 About the Technical Reviewer Manuel Jordan Elera is an autodidactic developer and researcher who enjoys learning new technologies for his own experiments and creating new integrations. Manuel won the 2010 Springy Award Community Champion and Spring Champion In his little free time, he reads the Bible and composes music on his guitar. Manuel is known as dr_pompeii. He has tech reviewed numerous books for Apress, including Pro Spring, Fourth Edition (2014); Practical Spring LDAP (2013); Pro JPA 2, Second Edition (2013); and Pro Spring Security (2013). Read his 13 detailed tutorials about many Spring technologies and contact him through his blog at You can also follow him on his Twitter xvii