重启服务器后重新连接RMI客户端

Question

我有一个RMI服务器和一个桌面RMI客户端。当我重新启动服务器时，客户端会出错。是否可能在不重新启动客户端的情况下重新启动RMI连接？

[编辑] 这是堆栈跟踪：

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

- Aaron Digulla

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你遇到了什么样的错误？ - akf

Answer 1

如果你正在使用Spring（特别是RmiProxyFactoryBean），你可以将属性refreshStubOnConnectFailure设置为true，那么该bean将在服务器重启后仍然存活。

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

- Aaron Digulla

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我正在使用Spring。这对我很有帮助。 - DragonFax

太棒了，非常感谢Spring和你的回答 :) - James

但是，如果服务器没有启动，我该如何让客户端开始运行呢？因为Bean无法连接... - Felipe Gutierrez

@FelipeGutierrez，关于这个问题，你可以使用lookupStubOnStartup属性来解决。将其设置为false应该可以允许你的客户端在RMI服务器尚未启动时启动。 - Ruslan Stelmachenko

对于Java配置：rmiProxyFactory.setRefreshStubOnConnectFailure(true) - Tinus Tate

Answer 2

当服务器终止时，您将收到一个ConnectException。之后，您只需使用Naming.lookup来获取一个新的服务器对象。

- tangens

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如果服务器已重新启动，则可能会出现“NoSuchObjectException”异常。 - user207421