A problem about GP Background CO call caf remote interface

Hi, Guys.
     My server is CE.
     When I developed my background co for my gp process, I tried to call a local interface of a ejb which is from a caf project.
     After I finished it and tested it by CO Test, it worked fine.
     But when I tried to test it by starting a process, I got an error meassage.
     Below is error message:
javax.ejb.EJBException: ASJ.ejb.005042 (Failed in component: demo.sap.com/ca_flowear) Exception raised from   invocation of private java.lang.Object com.sap.caf.rt.interceptors.LogInterceptor.aroundInvoke(javax.interceptor.InvocationContext) throws java.lang.Exception method on bean instance com.sap.demo.ca_flow.modeled.as.flow.appsrv.as_currenprocessor.AS_CurrenProcessorBeanImpl@7973ae6f for bean demo.sap.com/ca_flowearannotation|demo.sap.comca_flowejbmodule.jarannotation|com.sap.demo.ca_flow.modeled.as.flow.appsrv.as_currenprocessor.AS_CurrenProcessor in application demo.sap.com/ca_flow~ear.; nested exception is: java.lang.NullPointerException: while trying to invoke the method com.sap.engine.frame.core.thread.ThreadContext.getContextObject(int) of an object loaded from local variable 'tc"
I have no idea how to solve it.
I promise that it works fine when I test it by CO Test.
Thanks a lot.

Hi, all.
My problem looks like that my background co can`t find com/sap/caf/eu/gp/co/api/IGPBackgroundCallableObject.
I have checked this class which exists in caf/eu/gp/api and I have added it to my ear project with every kind of dependency including build time, design time, deploy time, and runtime.
Did I miss anything?
I really have no idea what I can do now.

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Message Edited by hanwei on 11-07-2008 03:18 PM
Attachments:
vb_labview_error_message_1.JPG ‏14 KB
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