[jboss-user] [Remoting] - JBOSS RMI OBJECT ACCESSING - IN A CLUSTERED ENVIRONMENT

[yogendra_g]

I have configured a jboss cluster with two nodes in it.
My application deployed on it contains a session bean. 
An RMI object is registered in the HA-JNDI.

There is one client program that lookup the session bean and executes its methods.

The session bean has following business login in it:
1. When the client sends first request to the bean, it generates a unique token(string) and creates a new instance of a DTO and stores this token(key)-DTO(value) in the remote object which has a hashmap.
The token is returned to the client program.
2. When the client sends second request to the bean along with the earlier token string, the bean lookup the RMI object and retrieve the DTO object from it using this token. 
This DTO itself is a remote object and stores anonther such key-value pair of another unique token and another DTO. The inner most DTO is not a remote object.
Thus in the first place when i create the outer DTO object and store it in the RMI object, i am actually storing the stub of it.

My problem is when the first request goes to first server, it stores the DTO stub; but when second request goes to second server and it retrieves the stub of the DTO and invokes the method on it, it throws the Connection refused to host exception with following details.

java.rmi.ConnectException: Connection refused to host: 172.20.72.92; nested exception is: 
	java.net.ConnectException: Connection refused: connect
	at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:567)
	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:101)
	at com.rainbow.core.session.SessionHandlerRemoteImpl_Stub.getApplicationSession(Unknown Source)
	at com.rainbow.core.session.SessionHandler.getApplicationSession(SessionHandler.java:1104)
	at com.rainbow.orchestrator.startup.OrchestratorLookupManager.lookupApplication(OrchestratorLookupManager.java:1115)
	at com.rainbow.orchestrator.ejb.OrchestratorBean.validateSessions(OrchestratorBean.java:517)
	at com.rainbow.orchestrator.ejb.OrchestratorBean.processRequest(OrchestratorBean.java:178)
	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:324)
	at org.jboss.invocation.Invocation.performCall(Invocation.java:359)
	at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:237)
	at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:158)
	at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:169)
	at org.jboss.ws.server.ServiceEndpointInterceptor.invoke(ServiceEndpointInterceptor.java:64)
	at org.jboss.ejb.plugins.CallValidationInterceptor.invoke(CallValidationInterceptor.java:63)
	at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:121)
	at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:350)
	at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:181)
	at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:168)
	at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:205)
	at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:136)
	at org.jboss.ejb.SessionContainer.internalInvoke(SessionContainer.java:648)
	at org.jboss.ejb.Container.invoke(Container.java:954)
	at sun.reflect.GeneratedMethodAccessor112.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:324)
	at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
	at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
	at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
	at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
	at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
	at org.jboss.invocation.jrmp.server.JRMPInvokerHA.invoke(JRMPInvokerHA.java:177)
	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:324)
	at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:261)
	at sun.rmi.transport.Transport$1.run(Transport.java:148)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.rmi.transport.Transport.serviceCall(Transport.java:144)
	at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
	at java.lang.Thread.run(Thread.java:534)
Caused by: java.net.ConnectException: Connection refused: connect
	at java.net.PlainSocketImpl.socketConnect(Native Method)
	at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:305)
	at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:171)
	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:158)
	at java.net.Socket.connect(Socket.java:452)
	at java.net.Socket.connect(Socket.java:402)
	at java.net.Socket.(Socket.java:309)
	at java.net.Socket.(Socket.java:124)
	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:562)
	... 46 more
	
Everything is fine when i have only one node in the cluster.

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