Weblogic 8.1 server : Nullpointer exception and clascast exception ?

We are getting this Nullpointer and class cast exception from Weblogic and our application fails.Any idea why we are getting and how to resolve it.
After we restart the server everything is good,but it comes back after 4 or 5 days.
com.telus.api.TelusAPIException:
     at com.telus.provider.account.TMAccountManager.findSubscriberByPhoneNumber(TMAccountManager.java:743)
     at com.telus.offermanagement.cmd.subscriber.impl.RetrieveSubscriberByMobileCmdImpl.execute(RetrieveSubscriberByMobileCmdImpl.java:49)
     at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
     at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:183)
----- Caused by -----
java.lang.NullPointerException
     at weblogic.rjvm.BasicOutboundRequest.sendReceive(BasicOutboundRequest.java:108)
     at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:290)
     at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:248)
2009-08-17 11:45:40,265 DEBUG [ExecuteThread: '55' for queue: 'weblogic.kernel.Default'] com.telus.offermanagement.webapp.action.InitClientAction - Kowbility authentication start:23075
2009-08-17 11:45:40,388 ERROR [ExecuteThread: '55' for queue: 'weblogic.kernel.Default'] com.telus.offermanagement.webapp.action.InitClientAction - TelusAPI authentication failed:TelusAPIException:23075
com.telus.api.TelusAPIException:
     at com.telus.provider.TMProvider.<init>(TMProvider.java:348)
     at com.telus.provider.TMProvider.<init>(TMProvider.java:212)
     at sun.reflect.GeneratedConstructorAccessor163.newInstance(Unknown Source)
     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
     at java.lang.reflect.Constructor.newInstance(Constructor.java:274)
     at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:224)
     at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:183)
----- Caused by -----
java.lang.ClassCastException
     at weblogic.rjvm.BasicOutboundRequest.sendReceive(BasicOutboundRequest.java:108)
     at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:290)
     at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:248)
     at com.telus.eas.utility.ejb.ReferenceDataHelper_cegd99_EOImpl_816_WLStub.authenticate(Unknown Source)
     at sun.reflect.GeneratedMethodAccessor170.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
Edited by: Manjit on Aug 21, 2009 3:51 PM

But here is the issue.We had same weblogic server installed before and after our deployment.The only thing that has changed is our marketing application.Hence wondering if our new changes has made weblogic to crash.Our older version of application has been running in the server for 6 years without any issue !!
Before I open a defect again Weblogic support I want to be 100% sure that our team (our application) is not responsible for crash.

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    ==================================================
    NewsGroup Rant
    ==================================================
    Rant 1.
    The less info you provide about your problem means
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