Java EE (Java Enterprise Edition) General Discussion

guys,

I am having this problem:

[#|2009-12-26T19:58:33.343+0800|WARNING|sun-appserver-pe9.0|javax.enterprise|_ThreadID=10;_ThreadName=main;_RequestID=2aa12511-bcac-499c-b3e9-59c84b85f9a7;|LCM0203: Lifecycle module [JBIFramework] threw ServerLifecycleException
com.sun.appserv.server.ServerLifecycleException: java.lang.LinkageError: loader constraint violation in interface itable initialization: when resolving method "com.sun.jbi.framework.EnvironmentContext.getProvider()Lcom/sun/jbi/JBIProvider;" the class loader (instance of java/net/URLClassLoader) of the current class, com/sun/jbi/framework/EnvironmentContext, and the class loader (instance of java/net/URLClassLoader) for interface com/sun/jbi/EnvironmentContext have different Class objects for the type com/sun/jbi/JBIProvider used in the signature
at com.sun.jbi.framework.sun.SunASJBIFramework.handleEvent(SunASJBIFramework.java:138)
at com.sun.appserv.server.ServerLifecycleModule.postEvent(ServerLifecycleModule.java:210)
at com.sun.appserv.server.ServerLifecycleModule.onInitialization(ServerLifecycleModule.java:241)
at com.sun.appserv.server.LifecycleModuleService.initialize(LifecycleModuleService.java:198)
at com.sun.appserv.server.LifecycleModuleService.onInitialization(LifecycleModuleService.java:129)
at com.sun.enterprise.server.ApplicationServer.onInitialization(ApplicationServer.java:238)
at com.sun.enterprise.server.ondemand.OnDemandServer.onInitialization(OnDemandServer.java:93)
at com.sun.enterprise.server.PEMain.run(PEMain.java:316)
at com.sun.enterprise.server.PEMain.main(PEMain.java:260)
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:597)
at com.sun.enterprise.server.PELaunch.main(PELaunch.java:272)
Caused by: java.lang.LinkageError: loader constraint violation in interface itable initialization: when resolving method "com.sun.jbi.framework.EnvironmentContext.getProvider()Lcom/sun/jbi/JBIProvider;" the class loader (instance of java/net/URLClassLoader) of the current class, com/sun/jbi/framework/EnvironmentContext, and the class loader (instance of java/net/URLClassLoader) for interface com/sun/jbi/EnvironmentContext have different Class objects for the type com/sun/jbi/JBIProvider used in the signature
at com.sun.jbi.framework.JBIFramework.init(JBIFramework.java:118)
at com.sun.jbi.framework.sun.SunASJBIFramework.handleEvent(SunASJBIFramework.java:93)
... 13 more

I am unable to start the sun java app server. Do you have any idea what cause this? I have two choices to solve this problem:
1) reinstall the app server (i don't know it will help or not buy my boss likes this solution)
2) check what is the problem (i prefer this as I need to know what is happening...sure my boss not gonna like this)

Can anyone help me??