NullPointerException inside RTC code
Dan Sevcenco (50●2●19●23)
| asked May 08 '13, 9:50 a.m.
edited May 08 '13, 10:48 a.m. by Ralph Schoon (63.5k●3●36●46)
I have developed an work-item advisor and a participant using an RTC instance deployed on Tomcat. The code runs fine on this development environment.
Now, I have deployed the code on a pre-production environment in which RTC is installed on Websphere Application Server. To my surprise, upon executing the action of saving a work-item, when the participant code is executed, RTC generates a run-time exception. The stack trace is at the end of this message. The participant invokes the operation fWorkitemServer.saveWorkItem2 The exception is thrown inside the package : com.ibm.team.workitem.service.internal.save. The participant code is inside package : itsm2.rtcext.workitem.extensions.service.participants.servicerequest. RTC version is 4.0.0 WAS version is 7.0.0.25 and it is deployed on AIX v7. How can I figure out what is wrong with the RTC deployment and operational configuration on WAS as oposed to Tomcat that is triggering this behaviour? ================ Stack trace begins here =================== 2013-05-08 21:11:39,346 [ WebContainer : 2] ERROR com.ibm.team.process.common - java.lang.NullPointerException at com.ibm.team.workitem.common.internal.util.SequenceValue$Factory.valueOf(SequenceValue.java:83) at com.ibm.team.workitem.service.internal.save.APTSequenceValueUpdater.handleNotifySave(APTSequenceValueUpdater.java:48) at com.ibm.team.workitem.service.internal.save.WorkItemSaveParticipant.handleNotifySave(WorkItemSaveParticipant.java:32) at com.ibm.team.workitem.service.internal.save.WorkItemSavePreparation.notifySave(WorkItemSavePreparation.java:204) at com.ibm.team.workitem.service.internal.WorkItemRepositoryService.notifyPreSave(WorkItemRepositoryService.java:425) at com.ibm.team.workitem.service.internal.WorkItemRepositoryService.access$2(WorkItemRepositoryService.java:419) at com.ibm.team.workitem.service.internal.WorkItemRepositoryService$1.run(WorkItemRepositoryService.java:337) at com.ibm.team.workitem.service.internal.WorkItemRepositoryService$1.run(WorkItemRepositoryService.java:1) at com.ibm.team.repository.service.internal.PrimitiveTransactionService$3.run(PrimitiveTransactionService.java:168) at com.ibm.team.repository.service.internal.rdb.RepositoryDatabase.runTransaction(RepositoryDatabase.java:321) at com.ibm.team.repository.service.internal.rdb.RepositoryDatabase.runInTransaction(RepositoryDatabase.java:245) at com.ibm.team.repository.service.internal.PrimitiveTransactionService.runInTransaction(PrimitiveTransactionService.java:102) at com.ibm.team.repository.service.internal.PrimitiveTransactionService.runInTransaction(PrimitiveTransactionService.java:97) at sun.reflect.GeneratedMethodAccessor153.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37) at java.lang.reflect.Method.invoke(Method.java:611) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.invoke(ExportProxyServiceRecord.java:361) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.access$0(ExportProxyServiceRecord.java:347) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord$ExportedServiceInvocationHandler.invoke(ExportProxyServiceRecord.java:56) at $Proxy110.runInTransaction(Unknown Source) at com.ibm.team.repository.service.AbstractService.runInTransaction(AbstractService.java:965) at com.ibm.team.workitem.service.internal.WorkItemRepositoryService.saveTransaction(WorkItemRepositoryService.java:326) at com.ibm.team.workitem.service.internal.WorkItemRepositoryService.save(WorkItemRepositoryService.java:284) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37) at java.lang.reflect.Method.invoke(Method.java:611) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.invoke(ExportProxyServiceRecord.java:361) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.access$0(ExportProxyServiceRecord.java:347) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord$ExportedServiceInvocationHandler.invoke(ExportProxyServiceRecord.java:56) at $Proxy583.save(Unknown Source) at com.ibm.team.workitem.service.internal.WorkItemServer.save(WorkItemServer.java:298) at com.ibm.team.workitem.service.internal.WorkItemServer.saveWorkItems(WorkItemServer.java:151) at com.ibm.team.workitem.service.internal.WorkItemServer.saveWorkItem3(WorkItemServer.java:120) at com.ibm.team.workitem.service.internal.WorkItemServer.saveWorkItem2(WorkItemServer.java:115) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37) at java.lang.reflect.Method.invoke(Method.java:611) at com.ibm.team.workitem.service.internal.ServiceAdapter.invoke(ServiceAdapter.java:74) at $Proxy558.saveWorkItem2(Unknown Source) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37) at java.lang.reflect.Method.invoke(Method.java:611) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.invoke(ExportProxyServiceRecord.java:361) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.access$0(ExportProxyServiceRecord.java:347) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord$ExportedServiceInvocationHandler.invoke(ExportProxyServiceRecord.java:56) at $Proxy560.saveWorkItem2(Unknown Source) at itsm2.rtcext.workitem.extensions.service.participants.servicerequest.ManageServiceRequestParticipant.saveWorkItem(ManageServiceRequestParticipant.java:594) at itsm2.rtcext.workitem.extensions.service.participants.servicerequest.ManageServiceRequestParticipant.run(ManageServiceRequestParticipant.java:133) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37) at java.lang.reflect.Method.invoke(Method.java:611) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.invoke(ExportProxyServiceRecord.java:361) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.access$0(ExportProxyServiceRecord.java:347) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord$ExportedServiceInvocationHandler.invoke(ExportProxyServiceRecord.java:56) at $Proxy730.run(Unknown Source) at com.ibm.team.process.internal.common.advice.runtime.OperationAdviceManager.runParticipant(OperationAdviceManager.java:1143) at com.ibm.team.process.internal.common.advice.runtime.OperationAdviceManager.runParticipants(OperationAdviceManager.java:973) at com.ibm.team.process.internal.common.advice.runtime.OperationAdviceManager.advise(OperationAdviceManager.java:318) at com.ibm.team.process.internal.common.util.AbstractProcess.doAdvise(AbstractProcess.java:196) at com.ibm.team.process.internal.service.ServerProcess.access$2(ServerProcess.java:1) at com.ibm.team.process.internal.service.ServerProcess$2.run(ServerProcess.java:156) at com.ibm.team.repository.service.internal.PrimitiveTransactionService$3.run(PrimitiveTransactionService.java:168) at com.ibm.team.repository.service.internal.rdb.RepositoryDatabase.runTransaction(RepositoryDatabase.java:321) at com.ibm.team.repository.service.internal.rdb.RepositoryDatabase.runInTransaction(RepositoryDatabase.java:245) at com.ibm.team.repository.service.internal.PrimitiveTransactionService.runInTransaction(PrimitiveTransactionService.java:102) at com.ibm.team.repository.service.internal.PrimitiveTransactionService.runInTransaction(PrimitiveTransactionService.java:97) at sun.reflect.GeneratedMethodAccessor153.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37) at java.lang.reflect.Method.invoke(Method.java:611) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.invoke(ExportProxyServiceRecord.java:361) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.access$0(ExportProxyServiceRecord.java:347) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord$ExportedServiceInvocationHandler.invoke(ExportProxyServiceRecord.java:56) at $Proxy110.runInTransaction(Unknown Source) at com.ibm.team.repository.service.internal.TransactionService.runInTransaction(TransactionService.java:37) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37) at java.lang.reflect.Method.invoke(Method.java:611) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.invoke(ExportProxyServiceRecord.java:361) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.access$0(ExportProxyServiceRecord.java:347) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord$ExportedServiceInvocationHandler.invoke(ExportProxyServiceRecord.java:56) at $Proxy186.runInTransaction(Unknown Source) at com.ibm.team.process.internal.service.ProcessService.runInTransaction(ProcessService.java:4614) at com.ibm.team.process.internal.service.ProcessService.runInTransaction(ProcessService.java:4621) at com.ibm.team.process.internal.service.ServerProcess.adviseAndExecute(ServerProcess.java:153) at com.ibm.team.workitem.service.internal.AuditableServerProcess.adviseAndExecute(AuditableServerProcess.java:86) at com.ibm.team.workitem.service.internal.WorkItemRepositoryService.processSave(WorkItemRepositoryService.java:566) at com.ibm.team.workitem.service.internal.WorkItemRepositoryService.save(WorkItemRepositoryService.java:491) at com.ibm.team.workitem.service.internal.WorkItemRepositoryService.save(WorkItemRepositoryService.java:464) at com.ibm.team.workitem.service.internal.WorkItemRepositoryService.access$3(WorkItemRepositoryService.java:460) at com.ibm.team.workitem.service.internal.WorkItemRepositoryService$1.run(WorkItemRepositoryService.java:340) at com.ibm.team.workitem.service.internal.WorkItemRepositoryService$1.run(WorkItemRepositoryService.java:1) at com.ibm.team.repository.service.internal.PrimitiveTransactionService$3.run(PrimitiveTransactionService.java:168) at com.ibm.team.repository.service.internal.rdb.RepositoryDatabase$Transaction.run(RepositoryDatabase.java:470) at com.ibm.team.repository.service.internal.rdb.RepositoryDatabase$1.run(RepositoryDatabase.java:294) at com.ibm.team.repository.service.internal.rdb.ConnectionPoolService.withCurrentConnection(ConnectionPoolService.java:381) at sun.reflect.GeneratedMethodAccessor48.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37) at java.lang.reflect.Method.invoke(Method.java:611) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.invoke(ExportProxyServiceRecord.java:361) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.access$0(ExportProxyServiceRecord.java:347) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord$ExportedServiceInvocationHandler.invoke(ExportProxyServiceRecord.java:56) at $Proxy74.withCurrentConnection(Unknown Source) at com.ibm.team.repository.service.internal.rdb.RepositoryDatabase.runTransaction(RepositoryDatabase.java:290) at com.ibm.team.repository.service.internal.rdb.RepositoryDatabase.runInTransaction(RepositoryDatabase.java:245) at com.ibm.team.repository.service.internal.PrimitiveTransactionService.runInTransaction(PrimitiveTransactionService.java:102) at com.ibm.team.repository.service.internal.PrimitiveTransactionService.runInTransaction(PrimitiveTransactionService.java:97) at sun.reflect.GeneratedMethodAccessor153.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37) at java.lang.reflect.Method.invoke(Method.java:611) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.invoke(ExportProxyServiceRecord.java:361) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.access$0(ExportProxyServiceRecord.java:347) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord$ExportedServiceInvocationHandler.invoke(ExportProxyServiceRecord.java:56) at $Proxy110.runInTransaction(Unknown Source) at com.ibm.team.repository.service.AbstractService.runInTransaction(AbstractService.java:965) at com.ibm.team.workitem.service.internal.WorkItemRepositoryService.saveTransaction(WorkItemRepositoryService.java:326) at com.ibm.team.workitem.service.internal.WorkItemRepositoryService.save(WorkItemRepositoryService.java:284) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37) at java.lang.reflect.Method.invoke(Method.java:611) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.invoke(ExportProxyServiceRecord.java:361) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.access$0(ExportProxyServiceRecord.java:347) at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord$ExportedServiceInvocationHandler.invoke(ExportProxyServiceRecord.java:56) at $Proxy583.save(Unknown Source) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37) at java.lang.reflect.Method.invoke(Method.java:611) at com.ibm.team.repository.servlet.AbstractTeamServerServlet.handleMethod(AbstractTeamServerServlet.java:1351) at com.ibm.team.repository.servlet.AbstractTeamServerServlet.executeMethod(AbstractTeamServerServlet.java:915) at com.ibm.team.repository.servlet.AbstractTeamServerServlet.doPost(AbstractTeamServerServlet.java:717) at javax.servlet.http.HttpServlet.service(HttpServlet.java:738) at com.ibm.team.repository.servlet.AbstractTeamServerServlet.handleRequest2(AbstractTeamServerServlet.java:2061) at com.ibm.team.repository.servlet.AbstractTeamServerServlet.handleRequest(AbstractTeamServerServlet.java:1878) at com.ibm.team.repository.servlet.AbstractTeamServerServlet.access$0(AbstractTeamServerServlet.java:1863) at com.ibm.team.repository.servlet.AbstractTeamServerServlet$1.service(AbstractTeamServerServlet.java:208) at com.ibm.team.repository.internal.service.auth.impl.JAuthHandler$1.run(JAuthHandler.java:102) at com.ibm.team.repository.servlet.AbstractTeamServerServlet.service(AbstractTeamServerServlet.java:1682) at javax.servlet.http.HttpServlet.service(HttpServlet.java:831) at org.eclipse.equinox.http.registry.internal.ServletManager$ServletWrapper.service(ServletManager.java:180) at org.eclipse.equinox.http.servlet.internal.ServletRegistration.service(ServletRegistration.java:61) at org.eclipse.equinox.http.servlet.internal.ProxyServlet.processAlias(ProxyServlet.java:126) at org.eclipse.equinox.http.servlet.internal.ProxyServlet.service(ProxyServlet.java:76) at javax.servlet.http.HttpServlet.service(HttpServlet.java:831) at org.eclipse.equinox.servletbridge.BridgeServlet.service(BridgeServlet.java:120) at com.ibm.team.repository.server.servletbridge.JazzServlet.service(JazzServlet.java:68) at javax.servlet.http.HttpServlet.service(HttpServlet.java:831) at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1657) at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1597) at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:131) at com.ibm.team.repository.server.servletbridge.BridgeFilter.processDelegate(BridgeFilter.java:133) at com.ibm.team.repository.server.servletbridge.BridgeFilter.doFilter(BridgeFilter.java:154) at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:188) at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:116) at com.ibm.ws.webcontainer.filter.WebAppFilterChain._doFilter(WebAppFilterChain.java:77) at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:908) at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:934) at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:502) at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:181) at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:91) at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:864) at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1592) at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:186) at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:452) at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:511) at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:305) at com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(HttpICLReadCallback.java:83) at com.ibm.ws.ssl.channel.impl.SSLReadServiceContext$SSLReadCompletedCallback.complete(SSLReadServiceContext.java:1784) at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165) at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217) at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161) at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138) at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204) at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775) at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905) at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1646) |
One answer
Ralph Schoon (63.5k●3●36●46)
| answered May 08 '13, 9:57 a.m.
FORUM ADMINISTRATOR / FORUM MODERATOR / JAZZ DEVELOPER
Please be aware that in the SDK you have client and server code. You can easily mix it. See http://rsjazz.wordpress.com/2013/03/14/what-apis-are-available-for-rtc-and-what-can-you-extend/ . If you do weird things happen. The other thing about null pointer is, for me it was usually my fault. Try to attach to your code in Tomcat as explained in the Extensions Workshop and try to find out what is null.
Comments Likely a Service or an object that you don't get for some reason.
Ralph,
Ralph Schoon
commented May 08 '13, 10:40 a.m.
| edited May 08 '13, 10:47 a.m.
FORUM ADMINISTRATOR / FORUM MODERATOR / JAZZ DEVELOPER
If it deploys on WebSphere it should indeed work as on Tomcat. So if you don't get deployment errors that would be my first assumption too. However, the assumption that the API can protect itself against null pointers and such is probably not true. I have seen too many of those where, my bad, things did not work out as I thought. E.g. if a service can not be fetched and is null, and you call it, there is nothing an API can reasonably expected to do about it.
OK, I'll give you that the API can have its own problems. And your example of badly written code is aimed at the participant code, which is not the case here.
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