Spring Boot上下文持续尝试连接到java rmi服务器但失败

Question

@Component
public class EmailMonitor implements ApplicationListener<ContextRefreshedEvent> {
    private static final Logger log = LoggerFactory.getLogger(EmailMonitor.class);

    @Override
    public void onApplicationEvent(ContextRefreshedEvent event) {
       // monitor emails
...
}

"RMI TCP Connection(1)-192.168.1.18: name = \"[Ljava.rmi.server.ObjID;\", codebase = \"\", defaultLoader = jdk.internal.loader.ClassLoaders$PlatformClassLoader@332228c4","logger_name":"sun.rmi.loader"...
...
{"@timestamp":"2021-05-10T17:01:22.212+01:00","@version":"1","message":"RMI TCP Connection(1)-192.168.1.18: name = \"javax.management.ObjectName\", codebase = \"\"","logger_name":"sun.rmi.loader","thread_name":"RMI TCP Connection(1)-192.168.1.18","level":"DEBUG","level_value":10000,"appname":"email-notifier"}
{"@timestamp":"2021-05-10T17:01:22.213+01:00","@version":"1","message":"connectionId=rmi://192.168.1.18  4, name=org.springframework.boot:type=Admin,name=SpringApplication, attribute=Ready","logger_name":"javax.management.remote.rmi","thread_name":"RMI TCP Connection(1)-192.168.1.18","level":"DEBUG","level_value":10000,"appname":"email-notifier"}
{"@timestamp":"2021-05-10T17:01:22.213+01:00","@version":"1","message":"RMI TCP Connection(1)-192.168.1.18: [192.168.1.18] exception: ","logger_name":"sun.rmi.server.call","thread_name":"RMI TCP Connection(1)-192.168.1.18","level":"DEBUG","level_value":10000,"stack_trace":"javax.management.InstanceNotFoundException: org.springframework.boot:type=Admin,name=SpringApplication\n\tat java.management/com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getMBean(DefaultMBeanServerInterceptor.java:1083)\n\tat java.management/com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(DefaultMBeanServerInterceptor.java:637)\n\tat java.management/com.sun.jmx.mbeanserver.JmxMBeanServer.getAttribute(JmxMBeanServer.java:678)\n\tat java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1443)\n\tat java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1307)\n\tat java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1399)\n\tat java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.getAttribute(RMIConnectionImpl.java:637)\n\tat java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)\n\tat java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)\n\tat java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)\n\tat java.base/java.lang.reflect.Method.invoke(Method.java:567)\n\tat java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357)\n\tat java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200)\n\tat java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197)\n\tat java.base/java.security.AccessController.doPrivileged(AccessController.java:691)\n\tat java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196)\n\tat java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:587)\n\tat java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:828)\n\tat java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:705)\n\tat java.base/java.security.AccessController.doPrivileged(AccessController.java:391)\n\tat java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:704)\n\tat java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)\n\tat java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)\n\tat java.base/java.lang.Thread.run(Thread.java:831)\n","appname":"email-notifier"}
{"@timestamp":"2021-05-10T17:01:22.214+01:00","@version":"1","message":"[javax.management.remote.rmi.RMIConnectionImpl@6d666aa: connectionId=rmi://192.168.1.18  4] closing.","logger_name":"javax.management.remote.rmi","thread_name":"RMI TCP Connection(1)-192.168.1.18","level":"DEBUG","level_value":10000,"appname":"email-notifier"}
{"@timestamp":"2021-05-10T17:01:22.214+01:00","@version":"1","message":"[javax.management.remote.rmi.RMIConnectionImpl@6d666aa: connectionId=rmi://192.168.1.18  4] closed.","logger_name":"javax.management.remote.rmi","thread_name":"RMI TCP Connection(1)-192.168.1.18","level":"DEBUG","level_value":10000,"appname":"email-notifier"}

对此有什么想法吗？我不确定RMI服务器在此上下文中的角色是什么（我正在努力寻找将Spring和RMI绑定在一起的doc引用）。我的理解是Spring将启动它需要的服务，但显然不是在这种情况下。

Answer 1

我想你误解了spring上下文侦听器的概念。

Spring应用程序上下文在Spring驱动的应用程序启动期间启动。它有各种“钩子”--一旦发生，你可以监听并得到通知。因此，是的，上下文可以被刷新，当它发生时，监听器“触发”并执行您的代码。但仅此而已--当上下文开始时，它实际上不会做任何有用的事情。例如，您可以在这里阅读上下文事件。

因此，考虑到这一点，基本上应用程序上下文会被刷新一次，并且在应用程序启动期间，侦听器也只会被调用一次。