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Mastering Spring Application Development
Mastering Spring Application Development

Mastering Spring Application Development: Gain expertise in developing and caching your applications running on the JVM with Spring

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Mastering Spring Application Development

Chapter 2. Messaging with Spring JMS

Java Messaging Services (JMS) is an API used to communicate between the components in an application or between applications. The messages can be sent and received between applications and components. The messaging agents behave like middlemen to create, receive, read, and send messages. The message consumer does not need to be available at all times to receive the message. The messaging agents store the messages and they can be read whenever required.

An architect would choose JMS to achieve a loosely coupled design. The messages are asynchronous, they are delivered as soon as they arrive, and there is no request sent for the messages. It also prevents redundancy and ensures that a particular message is delivered only once.

Types of messaging

There are two types of messaging domains to be chosen from, as per the requirement:

  • Point-to-point messaging:
    • Each message has only one consumer
    • There is no timing dependency
  • Publish-Subscribe messaging:
    • Each message has many consumers
    • Messages have a timing dependency - when an application sends a message to the messaging agent, the consumer needs to subscribe and be active to receive the messages

Message consumers

These are the ways of consuming messages provided by JMS API:

  • Message listeners
    • They provide an asynchronous messaging model
    • Listeners are like event watchers/listeners; whenever a message is available, the listener ensures that it reaches its destination
    • Listeners will call the onMessage() method
  • The receive() method
    • It provides a synchronous messaging model()
    • Messages are consumed by explicitly calling the receive() method from the connection factory

Message structure

A message consists of three parts:

  • Header: This contains information about the destination and timestamp...

Apache ActiveMQ

Apache ActiveMQ has many features that have made it a choice for messaging. The latest release is 5.10. The advantages of using ActiveMQ are as follows:

  • It supports REST API
  • It supports CXF Web services
  • It supports AJAX implementations
  • It provides complete support to the Spring framework
  • It works with all the major application servers, such as JBoss, Tomcat, Weblogic and Glassfish servers

Setting up ApacheMQ for point-to-point messaging

The following are the steps for setting up ApacheMQ:

  1. Download the latest Apache ActiveMQ.zip from http://activemq.apache.org/download.html.
  2. Unzip the ZIP file to E:\apachemq\.
  3. In the Command Prompt, go to the location E:\apachemq\apache-activemq-5.10-SNAPSHOT\bin\win32 and then click on apachemq.bat to start Apache ActiveMQ.
  4. Apache ActiveMQ will run on Jetty Server and is hence accessible through a URL.
  5. Click on the link http://localhost:8161/admin/index.jsp.
  6. The first time you do this, you will be asked for credentials; enter admin/admin.
  7. In the console...

Implementing the Order Management Messaging System with SpringJMS and ActiveMQ

In the preceding section about Apache ActiveMQ, we discussed the steps required to create a message queue and created an order queue. Now, let's send messages to the queue from the application.

The following table depicts the components of the application with JMS integrated with it.

The request flows from JSP to a Spring controller, which sets the order bean object and sends it orderSender (which is a JMS message sender class). The class puts the order object in the queue.

The JMS Receiver is the class which reads from the queue. The read object is sent to the OrderRepository class, which is a Mongo Repository class, and posts the messages to the MongoDB database.

Implementing the Order Management Messaging System with SpringJMS and ActiveMQ

The following table gives us an overview about the classes used to communicate with JMS with a Spring MVC application:

JSP

Controller

Bean

JMS sender

JMS receiver

MongoRepository

order.jsp

allorders.jsp

Order Controller.java

Order.java...

Working with multiple queues in ApacheMQ

In the preceding section, we demonstrated sending messages using Map Message to Order Queue. Now, we can have a look at how to work with multiple queues in ApacheMQ:

  1. Start the Apache ActiveMQ server, and in the console, click on Queues and create two queues.
  2. Let us create two queues and name the queues as follows:
    • PacktTestQueue1
    • PacktTestQueue2
    Working with multiple queues in ApacheMQ
  3. Create a new Spring project with the same dependency as the first example in the chapter.
  4. Create a PacktMessageListener class that implements the MessageListener interface. The class overrides the onMessage(Message message) method.
  5. Spring's DefaultMessageListener consumes the messages from the queue and calls the onMessage(Message message) method.
    PacktMessageListener:
    package com.packt.jms;
    
    import javax.jms.JMSException;
    import javax.jms.Message;
    import javax.jms.MessageListener;
    import javax.jms.TextMessage;
    
    public class  PacktMessageListener implements MessageListener{
      private PacktMessageSender packtmessagesender...

JMS transactions

In this section, let's see how we can include transactions in messaging. We shall first demonstrate messaging without transactions using a few scenarios. We shall first describe the scenarios and write a test case. Then, we shall develop an application around it. We shall demonstrate sending messages using the convertandsendmessage() method.

  • Scenario 1: This is a positive use case, which we have seen in previous sections as well.
    JMS transactions
    @Test
    public void testCorrectMessage() throws InterruptedException {
      Order order = new Order(0, "notification to deliver correctly");
      ordersender.convertAndSendMessage(QUEUE_INCOMING, order);
      
      Thread.sleep(6000);
      printResults();
      
      assertEquals(1, getSavedOrders());
      assertEquals(0, getMessagesInQueue(QUEUE_INCOMING));
      assertEquals(0, getMessagesInQueue(QUEUE_DLQ));
    }
  • Scenario 2: Here, let's use a negative scenario. The message producer sends information to the queues and the consumer reads it, but an exception occurs...

Types of messaging


There are two types of messaging domains to be chosen from, as per the requirement:

  • Point-to-point messaging:

    • Each message has only one consumer

    • There is no timing dependency

  • Publish-Subscribe messaging:

    • Each message has many consumers

    • Messages have a timing dependency - when an application sends a message to the messaging agent, the consumer needs to subscribe and be active to receive the messages

Message consumers

These are the ways of consuming messages provided by JMS API:

  • Message listeners

    • They provide an asynchronous messaging model

    • Listeners are like event watchers/listeners; whenever a message is available, the listener ensures that it reaches its destination

    • Listeners will call the onMessage() method

  • The receive() method

    • It provides a synchronous messaging model()

    • Messages are consumed by explicitly calling the receive() method from the connection factory

Message structure

A message consists of three parts:

  • Header: This contains information about the destination and timestamp...

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Description

If you are a Java developer with experience in developing applications with Spring, then this book is perfect for you. A good working knowledge of Spring programming conventions and applying dependency injections is recommended to make the most of this book.

Who is this book for?

If you are a Java developer with experience in developing applications with Spring, then this book is perfect for you. A good working knowledge of Spring programming conventions and applying dependency injections is recommended to make the most of this book.

What you will learn

  • The best approach to configuring Spring applications
  • Read as well as manipulate data in MongoDB using Spring Data
  • Configure Spring Batch to schedule jobs
  • Use Spring Hbase template implementation
  • Bootstrap your application with Spring Boot
  • Create and use Apache Hadoop jobs to handle big data
  • Integrate Spring with Thymeleaf
  • Create RESTful services and SOAP services using Spring Web Service framework
  • Develop maven applications by using the springintegrationftp package
  • Configure Hadoop jobs in the Spring framework
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Publication date : May 30, 2015
Length: 288 pages
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Language : English
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Table of Contents

13 Chapters
1. Spring Mongo Integration Chevron down icon Chevron up icon
2. Messaging with Spring JMS Chevron down icon Chevron up icon
3. Mailing with Spring Mail Chevron down icon Chevron up icon
4. Jobs with Spring Batch Chevron down icon Chevron up icon
5. Spring Integration with FTP Chevron down icon Chevron up icon
6. Spring Integration with HTTP Chevron down icon Chevron up icon
7. Spring with Hadoop Chevron down icon Chevron up icon
8. Spring with OSGI Chevron down icon Chevron up icon
9. Bootstrap your Application with Spring Boot Chevron down icon Chevron up icon
10. Spring Cache Chevron down icon Chevron up icon
11. Spring with Thymeleaf Integration Chevron down icon Chevron up icon
12. Spring with Web Service Integration Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
(1 Ratings)
5 star 0%
4 star 0%
3 star 0%
2 star 100%
1 star 0%
Michael Oct 07, 2015
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
Dont even think to buy this book.Try to download source from packtpub, to understand how raw it is.All of defined cases, for example OSGi or Hadoop, dont explain nothing - simple helloworld from official source.1 star for JMS case and Spring Cache.
Amazon Verified review Amazon
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