BAEL-3091: The Prototype Pattern in Java (changed code based on valid comments from a reader)

spring-jms/src/main/java/com/baeldung/spring/jms/Employee.java

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+package com.baeldung.spring.jms;
+
+public class Employee {
+    private String name;
+    private Integer age;
+
+    public Employee(String name, Integer age) {
+        this.name = name;
+        this.age = age;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public Integer getAge() {
+        return age;
+    }
+
+    public String toString() {
+        return "Employee: name(" + name + "), age(" + age + ")";
+    }
+}

spring-jms/src/main/java/com/baeldung/spring/jms/SampleJmsErrorHandler.java

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+package com.baeldung.spring.jms;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.util.ErrorHandler;
+
+public class SampleJmsErrorHandler implements ErrorHandler {
+
+    private static final Logger LOG = LoggerFactory.getLogger(SampleJmsErrorHandler.class);
+
+    @Override
+    public void handleError(Throwable t) {
+        LOG.warn("In default jms error handler...");
+        LOG.error("Error Message : {}", t.getMessage());
+    }
+
+}

spring-jms/src/main/java/com/baeldung/spring/jms/SampleJmsMessageSender.java

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+package com.baeldung.spring.jms;
+
+import org.springframework.jms.core.JmsTemplate;
+
+import javax.jms.Queue;
+import java.util.HashMap;
+import java.util.Map;
+
+public class SampleJmsMessageSender {
+
+    private JmsTemplate jmsTemplate;
+    private Queue queue;
+
+    public void setJmsTemplate(JmsTemplate jmsTemplate) {
+        this.jmsTemplate = jmsTemplate;
+    }
+
+    public void setQueue(Queue queue) {
+        this.queue = queue;
+    }
+
+    public void simpleSend() {
+        jmsTemplate.send(queue, s -> s.createTextMessage("hello queue world"));
+    }
+
+    public void sendMessage(final Employee employee) {
+        this.jmsTemplate.convertAndSend(employee);
+    }
+
+    public void sendTextMessage(String msg) {
+        this.jmsTemplate.send(queue, s -> s.createTextMessage(msg));
+    }
+}

spring-jms/src/main/java/com/baeldung/spring/jms/SampleListener.java

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+package com.baeldung.spring.jms;
+
+import org.springframework.jms.core.JmsTemplate;
+
+import javax.jms.JMSException;
+import javax.jms.Message;
+import javax.jms.MessageListener;
+import javax.jms.Queue;
+import javax.jms.TextMessage;
+import java.util.Map;
+
+public class SampleListener implements MessageListener {
+
+    private JmsTemplate jmsTemplate;
+    private Queue queue;
+
+    public void setJmsTemplate(JmsTemplate jmsTemplate) {
+        this.jmsTemplate = jmsTemplate;
+    }
+
+    public void setQueue(Queue queue) {
+        this.queue = queue;
+    }
+
+    public void onMessage(Message message) {
+        if (message instanceof TextMessage) {
+            try {
+                String msg = ((TextMessage) message).getText();
+                System.out.println("Received message: " + msg);
+                if (msg == null) {
+                    throw new IllegalArgumentException("Null value received...");
+                }
+            } catch (JMSException ex) {
+                throw new RuntimeException(ex);
+            }
+        }
+    }
+
+    public Employee receiveMessage() throws JMSException {
+        Map map = (Map) this.jmsTemplate.receiveAndConvert();
+        return new Employee((String) map.get("name"), (Integer) map.get("age"));
+    }
+
+}

spring-jms/src/main/java/com/baeldung/spring/jms/SampleMessageConverter.java

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+package com.baeldung.spring.jms;
+
+import org.springframework.jms.support.converter.MessageConversionException;
+import org.springframework.jms.support.converter.MessageConverter;
+
+import javax.jms.JMSException;
+import javax.jms.MapMessage;
+import javax.jms.Message;
+import javax.jms.Session;
+
+public class SampleMessageConverter implements MessageConverter {
+
+    public Message toMessage(Object object, Session session) throws JMSException, MessageConversionException {
+        Employee employee = (Employee) object;
+        MapMessage message = session.createMapMessage();
+        message.setString("name", employee.getName());
+        message.setInt("age", employee.getAge());
+        return message;
+    }
+
+    public Object fromMessage(Message message) throws JMSException, MessageConversionException {
+        MapMessage mapMessage = (MapMessage) message;
+        return new Employee(mapMessage.getString("name"), mapMessage.getInt("age"));
+    }
+
+}

spring-jms/src/main/resources/EmbeddedActiveMQ.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns="http://www.springframework.org/schema/beans"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
+	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
+	xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
+	xmlns:util="http://www.springframework.org/schema/util" xmlns:task="http://www.springframework.org/schema/task"
+	xmlns:amq="http://activemq.apache.org/schema/core"
+	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://activemq.apache.org/schema/core
+                        http://activemq.apache.org/schema/core/activemq-core-5.2.0.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd">
+
+	<!-- Embedded ActiveMQ Broker -->
+	<amq:broker id="broker" useJmx="false" persistent="false"
+		useShutdownHook="false">
+		<amq:transportConnectors>
+			<amq:transportConnector uri="tcp://localhost:61616" />
+		</amq:transportConnectors>
+	</amq:broker>
+</beans>

spring-jms/src/main/resources/applicationContext.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns="http://www.springframework.org/schema/beans" xmlns:amq="http://activemq.apache.org/schema/core" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
+  http://activemq.apache.org/schema/core http://activemq.apache.org/schema/core/activemq-core.xsd">
+
+    <!-- JmsTemplate Definition -->
+    <bean id="jmsTemplate" class="org.springframework.jms.core.JmsTemplate">
+        <property name="connectionFactory" ref="connectionFactory" />
+        <property name="defaultDestination" ref="destinationQueue" />
+        <property name="messageConverter" ref="myMessageConverter" />
+    </bean>
+
+    <bean id="amqConnectionFactory" class="org.apache.activemq.ActiveMQConnectionFactory">
+        <constructor-arg index="0" value="tcp://localhost:61616" />
+    </bean>
+
+    <!-- ConnectionFactory Definition -->
+    <bean id="connectionFactory" class="org.springframework.jms.connection.SingleConnectionFactory">
+        <constructor-arg ref="amqConnectionFactory" />
+    </bean>
+
+    <bean id="destinationQueue" class="org.apache.activemq.command.ActiveMQQueue">
+        <constructor-arg index="0" value="IN_QUEUE" />
+    </bean>
+
+    <bean id="SampleJmsMessageSender" class="com.baeldung.spring.jms.SampleJmsMessageSender">
+        <property name="queue" ref="destinationQueue" />
+        <property name="jmsTemplate" ref="jmsTemplate" />
+    </bean>
+
+    <bean id="myMessageConverter" class="com.baeldung.spring.jms.SampleMessageConverter" />
+
+    <!-- this is the Message-Driven POJO (MDP) -->
+    <bean id="messageListener" class="com.baeldung.spring.jms.SampleListener">
+        <property name="jmsTemplate" ref="jmsTemplate" />
+        <property name="queue" ref="destinationQueue" />
+    </bean>
+
+    <bean id="errorHandler" class="com.baeldung.spring.jms.SampleJmsErrorHandler" />
+
+    <!-- and this is the message listener container -->
+    <bean id="jmsContainer" class="org.springframework.jms.listener.DefaultMessageListenerContainer">
+        <property name="connectionFactory" ref="connectionFactory" />
+        <property name="destinationName" value="IN_QUEUE" />
+        <property name="messageListener" ref="messageListener" />
+        <property name="errorHandler" ref="errorHandler" />
+    </bean>
+</beans>

spring-jms/src/main/resources/logback.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
+            </pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-jms/src/main/webapp/META-INF/MANIFEST.MF

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+Manifest-Version: 1.0
+Class-Path: 
+

spring-jms/src/test/java/com/baeldung/spring/jms/DefaultTextMessageSenderIntegrationTest.java

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+package com.baeldung.spring.jms;
+
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
+public class DefaultTextMessageSenderIntegrationTest {
+
+    private static SampleJmsMessageSender messageProducer;
+    private static SampleListener messageListener;
+
+    @SuppressWarnings("resource")
+    @BeforeClass
+    public static void setUp() {
+        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("classpath:EmbeddedActiveMQ.xml", "classpath:applicationContext.xml");
+        messageProducer = (SampleJmsMessageSender) applicationContext.getBean("SampleJmsMessageSender");
+        messageListener = (SampleListener) applicationContext.getBean("messageListener");
+    }
+
+    @Test
+    public void testSimpleSend() {
+        messageProducer.simpleSend();
+    }
+
+    @Test
+    public void testSendTextMessage() {
+        messageProducer.sendTextMessage(null);
+    }
+
+}

spring-jms/src/test/java/org/baeldung/SpringContextIntegrationTest.java

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+package org.baeldung;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration(locations = { "classpath:applicationContext.xml" })
+public class SpringContextIntegrationTest {
+
+    @Test
+    public void whenSpringContextIsBootstrapped_thenNoExceptions() {
+    }
+}

spring-jms/src/test/java/org/baeldung/SpringContextTest.java

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+package org.baeldung;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration(locations = { "classpath:applicationContext.xml" })
+public class SpringContextTest {
+
+    @Test
+    public void whenSpringContextIsBootstrapped_thenNoExceptions() {
+    }
+}