Exception while testing for Fail over

Question

Hi
          I have the web tier architecture away from cluster. All ejbs are in cluster
          running in two seperate machines say server1 and server2 . We have a
          factory class running in
          webtier(we use servlet in this tier) which obtains home interface only once
          and stores it for future reference. When ever we need the remoteobject stub,
          we ask the factory class and which in turn uses the stored home interface to
          get the same.
          In the webtier, I list all the servers in the cluster as a part of url as
          t3://server1,server2:8000
          I started the web tier as well as Object tier cluster. I could see the
          request coming in both the machines in the cluster for the ejb. But When I
          bring down one the server say server1 in the cluster, I get the following
          exception.
          java.lang.NullPointerException
          at weblogic.rjvm.RJVMFinder.isThisHost(RJVMFinder.java:340)
          at weblogic.rjvm.RJVMFinder.isHostedByLocalRJVM(RJVMFinder.java:314)
          at weblogic.rjvm.RJVMFinder.findOrCreate(RJVMFinder.java:151)
          at weblogic.rjvm.ServerURL.findOrCreateRJVM(ServerURL.java:200)
          at
          weblogic.jndi.WLInitialContextFactoryDelegate.getInitialContext(WLInitialCon
          textFactoryDelegate.java:195)
          at weblogic.jndi.Environment.getContext(Environment.java:122)
          at weblogic.jndi.Environment.getInitialContext(Environment.java:105)
          at
          weblogic.service.BasicReplicaList.forceRefresh(BasicReplicaList.java:196)
          at weblogic.service.BasicReplicaList.refresh(BasicReplicaList.java:182)
          at
          weblogic.service.BasicReplicaHandler.refreshReplicaList(BasicReplicaHandler.
          java:331)
          at
          weblogic.service.BasicReplicaHandler.failOver(BasicReplicaHandler.java:123)
          at weblogic.service.BasicServiceStub._wl_failOver(BasicServiceStub.java:91)
          at
          weblogic.service.BasicServiceStub._wl_autoFailOver(BasicServiceStub.java:118
          at
          com.mportal.server.device.CommEndPointImplHomeImpl_ServiceStub.findByDeviceN
          umber(CommEndPointImplHomeImpl_ServiceStub.java:169)
          at
          com.mportal.router.servlet.mPortalServlet.processRequest(mPortalServlet.java
          :241)
          at
          com.mportal.router.servlet.mPortalServlet.handleRequest(mPortalServlet.java:
          184)
          at com.mportal.router.servlet.mPortalServlet.doGet(mPortalServlet.java:93)
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
          at
          weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
          :124)
          at
          weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImp
          l.java:744)
          at
          weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImp
          l.java:692)
          at
          weblogic.servlet.internal.ServletContextManager.invokeServlet(ServletContext
          Manager.java:251)
          at
          weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.java:363)
          at weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java:263)
          at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
          Then I bring up the Server1 (Which was the one I brought it down), I get the
          same message in the web-tier and the following in the
          Server 1 machine(which is in cluster).
          Mon May 21 23:11:38 EDT 2001:<E> <NT Performance Pack> failure in
          processSockets() loop: GetData: fd=1324 numBytes=87
          java.lang.NullPointerException
          at
          weblogic.rjvm.ConnectionManager.gotExceptionSending(ConnectionManager.java:7
          53)
          at
          weblogic.rjvm.ConnectionManager.gotExceptionSending(ConnectionManager.java:7
          46)
          at weblogic.socket.JVMAbbrevSocket.sendOutMsg(JVMAbbrevSocket.java:362)
          at weblogic.socket.JVMAbbrevSocket.sendMsg(JVMAbbrevSocket.java:237)
          at weblogic.socket.JVMAbbrevSocket.sendMsg(JVMAbbrevSocket.java:170)
          at
          weblogic.rjvm.ConnectionManagerServer.handleRJVM(ConnectionManagerServer.jav
          a:103)
          at weblogic.rjvm.ConnectionManager.dispatch(ConnectionManager.java:630)
          at weblogic.socket.JVMAbbrevSocket.dispatch(JVMAbbrevSocket.java:393)
          at weblogic.socket.JVMSocketT3.dispatch(JVMSocketT3.java:355)
          at weblogic.socket.NTSocketMuxer.processSockets(NTSocketMuxer.java:424)
          at weblogic.socket.SocketReaderRequest.execute(SocketReaderRequest.java:23)
          at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
          Any one's help is appreciated.
          Thanks
          Suresh
          

Answer 1

You're not giving us much to go on, you know.
There's code that results in this exception.
There's a full stack trace somewhere.
What does your client look like?
How was it generated?
Which particular framework are you using (Axis? JWS? Something else?)...