我有两个服务应该通过 ActiveMQ 相互通信。当我将接收器和发送器放在一个服务中时,一切都运行良好,但是当我将它们分开时,我遇到了一个奇怪的 activemq 异常。
这是服务A的配置:
@EnableScheduling
@SpringBootApplication
@EnableJms
public class App extends SpringBootServletInitializer {
private static final Logger log = LoggerFactory.getLogger(App.class);
@Autowired
private static JmsTemplate jms;
public static void main(String[] args) {
SpringApplication.run(App.class, args);
}
}
发送消息:
@Autowired
private JmsTemplate jms;
public void sendTicket(Reservation reservation) {
log.debug("---------------sending message----------------");
// Send a message
jms.send("mailbox-destination", new MessageCreator() {
public ObjectMessage createMessage(Session session) throws JMSException {
ObjectMessage message = session.createObjectMessage();
message.setObject(reservation);
return message;
}
});
}
JMS 配置为内存队列:
spring.activemq.in-memory=true
spring.activemq.pooled=false
服务 B 类似,但 id 没有定义 JmsContainerFactory。它只有接收器:
@Component
public class Receiver {
private static final Logger log = LoggerFactory.getLogger(Receiver.class);
/**
* Receive a message with reservation and print it out as a e-ticket.
*
* @param reservation
*/
@JmsListener(destination = "mailbox-destination")
public void receiveMessage(Reservation reservation) {
log.info("Received <" + reservation.getId() + ">");
}
}
服务 A 将 JMS 和 ActiveMQ 代理作为 Maven 依赖项:
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jms</artifactId>
</dependency>
<dependency>
<groupId>org.apache.activemq</groupId>
<artifactId>activemq-broker</artifactId>
</dependency>
服务 B 仅具有 JMS 依赖性。
您能否给我一个提示,如何在两个服务之间共享 bean 并在它们之间发送消息?我对这个话题完全陌生。
收到消息时出现以下异常
org.springframework.jms.UncategorizedJmsException: Uncategorized exception occured during JMS processing; nested exception is javax.jms.JMSException: Could not create Transport. Reason: javax.management.InstanceAlreadyExistsException: org.apache.activemq:type=Broker,brokerName=localhost
编辑:如果我从其中一项服务中删除代理依赖项,Tomcat 甚至不会启动:
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]]
at java.util.concurrent.FutureTask.report(FutureTask.java:122)
at java.util.concurrent.FutureTask.get(FutureTask.java:192)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:917)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:439)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:769)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.startup.Catalina.start(Catalina.java:625)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:351)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:485)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1409)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1399)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.catalina.LifecycleException: A child container failed during start
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:925)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:871)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 6 common frames omitted