我正在尝试将OpenLiberty 18.0.0.2配置为使用嵌入式消息传递来发送一些简单的JMS消息。
我当前的server.xml如下所示：
<?xml version="1.0" encoding="UTF-8"?>
<server description="new server">
<featureManager>
<feature>javaee-8.0</feature>
<feature>mpConfig-1.2</feature>
<feature>mpMetrics-1.1</feature>
<feature>wasJmsServer-1.0</feature>
<feature>wasJmsClient-2.0</feature>
<feature>localConnector-1.0</feature>
</featureManager>
<quickStartSecurity userName="admin" userPassword="adminpwd" />
<httpEndpoint id="defaultHttpEndpoint" httpPort="9080" httpsPort="9443" />
<applicationManager autoExpand="true" />
<applicationMonitor updateTrigger="mbean" />
<messagingEngine>
<queue id="QUEUE1" />
</messagingEngine>
<jmsQueueConnectionFactory jndiName="jms/JmsFactory">
<properties.wasJms remoteServerAddress="localhost:7276:BootStrapBasicMessaging" />
</jmsQueueConnectionFactory>
<jmsQueue jndiName="jms/JmsQueue">
<properties.wasJms queueName="QUEUE1" />
</jmsQueue>
</server>
我的JMS发送者如下所示：
public class JmsMessageSender {
@Resource(mappedName = "jms/JmsFactory")
private ConnectionFactory jmsFactory;
@Resource(mappedName = "jms/JmsQueue")
private Queue jmsQueue;
public void send() {
TextMessage message;
try (Connection connection = jmsFactory.createConnection();
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
MessageProducer producer = session.createProducer(jmsQueue)) {
message = session.createTextMessage();
message.setText("Hello World!");
producer.send(message);
} catch (JMSException e) {
e.printStackTrace();
}
}
}
在运行应用程序时，尝试将消息发送到嵌入式消息传递队列时出现以下异常：
javax.jms.InvalidDestinationException: CWSIA0281E: The specified value null is not allowed for Destination.
[err] at com.ibm.ws.sib.api.jms.impl.JmsDestinationImpl.checkNativeInstance(JmsDestinationImpl.java:993)
[err] at [internal classes]
似乎我的代码无法通过JNDI获取队列目的地。我是否配置了错误的嵌入式消息传递或源代码中的错误？
更新1 ：
我更新了源代码，以免将目标传递给.send()方法，而现在启动时出现以下错误：
[ERROR ] cdi.resource.injection.error.CWOWB1000E
CWNEN0030E: The server was unable to obtain an object instance for the java:comp/env/de.rieckpil.blog.JmsMessageSender/jmsQueue reference.
The exception message was: CWNEN1004E: The server was unable to find the de.rieckpil.blog.JmsMessageSender/jmsQueue default binding with the javax.jms.Queue type for the java:comp/env/de.rieckpil.blog.JmsMessageSender/jmsQueue reference.
更新2：
现在可以发送消息，但是我无法接收到消息。我的消息驱动bean如下所示（启用了功能mdb-3.2）：
@MessageDriven(activationConfig = {
@ActivationConfigProperty(propertyName = "destination",
propertyValue = "jms/JmsQueue"),
@ActivationConfigProperty(propertyName = "destinationType",
propertyValue = "javax.jms.Queue")
})
public class JmsMessageReader implements MessageListener {
@Override
public void onMessage(Message message) {
TextMessage textMessage = (TextMessage) message;
try {
System.out.println("Message arrived: " + textMessage.getText());
} catch (JMSException e) {
System.err.println(e.getMessage());
}
}
}
答案 0 :(得分：2)
编辑：评论后更新，指出资源注入存在问题
首先，修复JMS API使用情况，使其仅在目标中传递一次（不能同时在createProducer()和send()上传递。否则，您可能会遇到 CWSIA0066E 故障。
第二，将@Resource属性从 mappedName 更改为查找
@Resource(lookup = "jms/JmsFactory")
private ConnectionFactory jmsFactory;
@Resource(lookup = "jms/JmsQueue")
private Queue jmsQueue;
public void send() {
TextMessage message;
try (Connection connection = jmsFactory.createConnection();
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
MessageProducer producer = session.createProducer(jmsQueue)) {
message = session.createTextMessage();
message.setText("Hello World!");
// Don't pass in destination again since you set it in createProducer()
producer.send(message);
// ...
@Resource注入最后，@Resource注入在任何旧的POJO中都不会起作用，而只能在容器扫描的特殊类中起作用。尝试将注入移动到servlet，EJB或CDI管理的bean。
尽管我可以理解为什么您会想到将其称为“嵌入式MQ”，但是您在这里使用的“消息引擎”实际上是由Liberty embedded messaging提供的。
它也是JMS提供者。也就是说，它实现了JMS API，而MQ则实现了MQ，后者是IBM可以在Liberty中使用的另一个JMS提供程序。