Ponownie połącz klienta RMI po restarcie serwera

Question

Mam serwer RMI i komputerowy klient RMI. Po ponownym uruchomieniu serwera pojawiają się błędy w kliencie. Czy możliwe jest ponowne uruchomienie połączenia RMI bez restartowania klienta?

[EDIT] Oto StackTrace:

java.rmi.ConnectException: Connection refused to host: xxx.xxx.xxx.xxx; nested exception is: 
    java.net.ConnectException: Connection refused: connect 
    at ...user code... 
Caused by: java.rmi.ConnectException: Connection refused to host: xxx.xxx.xxx.xxx; nested exception is: 
    java.net.ConnectException: Connection refused: connect 
    at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:574) 
    at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:185) 
    at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:171) 
    at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:94) 
    at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:179) 
    at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:132) 
    at $Proxy0.search(Unknown Source) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:592) 
    at org.springframework.remoting.rmi.RmiClientInterceptorUtils.invokeRemoteMethod(RmiClientInterceptorUtils.java:108) 
    at org.springframework.remoting.rmi.RmiClientInterceptor.doInvoke(RmiClientInterceptor.java:362) 
    at org.springframework.remoting.rmi.RmiClientInterceptor.invoke(RmiClientInterceptor.java:258) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171) 
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204) 
    at $Proxy1.search(Unknown Source) 
    ... 3 more 
Caused by: java.net.ConnectException: Connection refused: connect 
    at java.net.PlainSocketImpl.socketConnect(Native Method) 
    at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333) 
    at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195) 
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182) 
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:367) 
    at java.net.Socket.connect(Socket.java:524) 
    at java.net.Socket.connect(Socket.java:474) 
    at java.net.Socket.<init>(Socket.java:371) 
    at java.net.Socket.<init>(Socket.java:184) 
    at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:22) 
    at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:128) 
    at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:569) 
    ... 20 more 

Answer 1

Gdy serwer jest zakończona, otrzymasz ConnectException. Po tym możesz po prostu użyć Naming.lookup, aby uzyskać nowy obiekt serwera.

Answer 2

Jeśli używasz Spring (a mianowicie RmiProxyFactoryBean), możesz po prostu ustawić właściwość refreshStubOnConnectFailure na true, a komponent bean przeżyje ponowne uruchomienie serwera.

<property name="refreshStubOnConnectFailure" value="true" />