java.lang.NumberFormatException: null

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java.lang.NumberFormatException: null
at java.lang.Long.parseLong(Long.java:404)
at java.lang.Long.parseLong(Long.java:483)
at com.collaxa.cube.engine.audit.AuditService.transformToBPELAuditEventWrapper(AuditService.java:133)
at com.collaxa.cube.engine.audit.AuditTrail.logEvent(AuditTrail.java:140)
at com.collaxa.cube.engine.audit.AuditHelper.doLogEvent(AuditHelper.java:219)
at com.collaxa.cube.engine.audit.AuditHelper.logEvent(AuditHelper.java:146)
at com.collaxa.cube.engine.ext.bpel.common.BPELWMPLogHelper.logAudit(BPELWMPLogHelper.java:87)
at com.collaxa.cube.engine.ext.common.InvokeHandler.__callback(InvokeHandler.java:990)
at com.collaxa.cube.engine.ext.common.InvokeHandler.handleNormalInvoke(InvokeHandler.java:657)
at com.collaxa.cube.engine.ext.common.InvokeHandler.handle(InvokeHandler.java:143)
at com.collaxa.cube.engine.ext.bpel.common.wmp.BPELInvokeWMP.__executeStatements(BPELInvokeWMP.java:74)
at com.collaxa.cube.engine.ext.bpel.common.wmp.BaseBPELActivityWMP.perform(BaseBPELActivityWMP.java:188)
at com.collaxa.cube.engine.CubeEngine.performActivity(CubeEngine.java:2864)
at com.collaxa.cube.engine.CubeEngine._handleWorkItem(CubeEngine.java:1260)
at com.collaxa.cube.engine.CubeEngine.handleWorkItem(CubeEngine.java:1155)
at com.collaxa.cube.engine.dispatch.message.instance.PerformMessageHandler.handleLocal(PerformMessageHandler.java:106)
at com.collaxa.cube.engine.dispatch.DispatchHelper.handleLocalMessage(DispatchHelper.java:308)
at com.collaxa.cube.engine.dispatch.DispatchHelper.sendMemory(DispatchHelper.java:387)
at com.collaxa.cube.engine.CubeEngine.endRequest(CubeEngine.java:4855)
at com.collaxa.cube.engine.CubeEngine.endRequest(CubeEngine.java:4779)
at com.collaxa.cube.engine.CubeEngine._callbackPerformer(CubeEngine.java:1458)
at com.collaxa.cube.engine.CubeEngine.callbackPerformer(CubeEngine.java:1394)
at com.collaxa.cube.engine.delivery.DeliveryHelper.callbackPerformer(DeliveryHelper.java:407)
at com.collaxa.cube.engine.delivery.DeliveryService.handleCallback(DeliveryService.java:952)
at com.collaxa.cube.engine.delivery.DeliveryService.handleCallback(DeliveryService.java:855)
at com.collaxa.cube.engine.ejb.impl.CubeDeliveryBean.handleCallback(CubeDeliveryBean.java:390)
at com.collaxa.cube.engine.ejb.impl.bpel.BPELDeliveryBean_5k948i_ICubeDeliveryLocalBeanImpl.__WL_invoke(Unknown Source)
at weblogic.ejb.container.internal.SessionLocalMethodInvoker.invoke(SessionLocalMethodInvoker.java:33)
at com.collaxa.cube.engine.ejb.impl.bpel.BPELDeliveryBean_5k948i_ICubeDeliveryLocalBeanImpl.handleCallback(Unknown Source)
at com.collaxa.cube.engine.dispatch.message.instance.CallbackDeliveryMessageHandler.handle(CallbackDeliveryMessageHandler.java:63)
at com.collaxa.cube.engine.dispatch.DispatchHelper.handleMessage(DispatchHelper.java:153)
at com.collaxa.cube.engine.dispatch.BaseDispatchTask.process(BaseDispatchTask.java:132)
at com.collaxa.cube.engine.dispatch.BaseDispatchTask.run(BaseDispatchTask.java:90)
at com.collaxa.cube.engine.dispatch.WMExecutor$W.run(WMExecutor.java:239)
at weblogic.work.j2ee.J2EEWorkManager$WorkWithListener.run(J2EEWorkManager.java:184)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:311)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:263)

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