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NullPointer Exception at ServiceTunnelResponse [message #1848577] Wed, 08 December 2021 08:04 Go to next message
Eclipse UserFriend
Hello Volks,
I have the following problem with my application :
First I started splitting the application into several modules using the extension mechanism and it worked very well. In the momement I wanted to split the ui.html bundle into 2 submodules the core one and the module one this error started to show up

A null pointer exception at this level caused by

serverRunContext.getClientNotificationCollector()


index.php/fa/41433/0/


This is the full message

2021-12-08 14:01:33,078 ERROR [scout-thread-2 ClientNotificationPoller] org.eclipse.scout.rt.client.clientnotification.ClientNotificationPoller.run(ClientNotificationPoller.java:119) - Error receiving client notifications - MDC[jobName=ClientNotificationPoller]
org.eclipse.scout.rt.shared.servicetunnel.http.HttpServiceTunnelException: Service tunnel request failed with status code 500 [user=notification-authenticator, remote-service.name=org.eclipse.scout.rt.shared.clientnotification.IClientNotificationService, remote-service.operation=getNotifications]
	at org.eclipse.scout.rt.shared.servicetunnel.http.RemoteServiceInvocationCallable.call(RemoteServiceInvocationCallable.java:83)
	at org.eclipse.scout.rt.shared.servicetunnel.http.RemoteServiceInvocationCallable.call(RemoteServiceInvocationCallable.java:1)
	at org.eclipse.scout.rt.platform.chain.callable.CallableChain$Chain.continueChain(CallableChain.java:227)
	at org.eclipse.scout.rt.platform.chain.callable.CallableChain$Chain.continueChain(CallableChain.java:227)
	at org.eclipse.scout.rt.platform.transaction.TransactionProcessor.runTxMandatory(TransactionProcessor.java:156)
	at org.eclipse.scout.rt.platform.transaction.TransactionProcessor.runTxRequired(TransactionProcessor.java:139)
	at org.eclipse.scout.rt.platform.transaction.TransactionProcessor.intercept(TransactionProcessor.java:78)
	at org.eclipse.scout.rt.platform.chain.callable.CallableChain$Chain.continueChain(CallableChain.java:222)
	at org.eclipse.scout.rt.platform.chain.callable.CallableChain.call(CallableChain.java:170)
	at org.eclipse.scout.rt.platform.context.RunContext.call(RunContext.java:158)
	at org.eclipse.scout.rt.platform.context.RunContextRunner.intercept(RunContextRunner.java:38)
	at org.eclipse.scout.rt.platform.chain.callable.CallableChain$Chain.continueChain(CallableChain.java:222)
	at org.eclipse.scout.rt.platform.job.internal.CallableChainExceptionHandler.intercept(CallableChainExceptionHandler.java:33)
	at org.eclipse.scout.rt.platform.chain.callable.CallableChain$Chain.continueChain(CallableChain.java:222)
	at org.eclipse.scout.rt.platform.chain.callable.CallableChain.call(CallableChain.java:170)
	at org.eclipse.scout.rt.platform.job.internal.JobFutureTask.lambda$0(JobFutureTask.java:106)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at org.eclipse.scout.rt.platform.job.internal.JobFutureTask.run(JobFutureTask.java:175)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:834)
	at org.eclipse.scout.rt.platform.job.internal.NamedThreadFactory$1.run(NamedThreadFactory.java:63)
	at org.eclipse.scout.rt.shared.servicetunnel.AbstractServiceTunnel.invokeService(AbstractServiceTunnel.java:64)
	at org.eclipse.scout.rt.shared.servicetunnel.AbstractServiceTunnel.invokeService(AbstractServiceTunnel.java:40)
	at org.eclipse.scout.rt.shared.servicetunnel.http.HttpServiceTunnel.invokeService(HttpServiceTunnel.java:192)
	at org.eclipse.scout.rt.shared.servicetunnel.ServiceTunnelProxyProducer.invoke(ServiceTunnelProxyProducer.java:51)
	at org.eclipse.scout.rt.platform.interceptor.DecoratingProxy.invokeImpl(DecoratingProxy.java:137)
	at org.eclipse.scout.rt.platform.interceptor.DecoratingProxy$P_InvocationHandler.invoke(DecoratingProxy.java:170)
	at com.sun.proxy.$Proxy21.getNotifications(Unknown Source)
	at org.eclipse.scout.rt.client.clientnotification.ClientNotificationPoller$P_NotificationPoller.lambda$0(ClientNotificationPoller.java:107)
	at org.eclipse.scout.rt.platform.util.concurrent.Callables.lambda$0(Callables.java:31)
	at org.eclipse.scout.rt.platform.chain.callable.CallableChain$Chain.continueChain(CallableChain.java:227)
	at org.eclipse.scout.rt.platform.transaction.TransactionProcessor.runTxMandatory(TransactionProcessor.java:156)
	at org.eclipse.scout.rt.platform.transaction.TransactionProcessor.runTxRequired(TransactionProcessor.java:139)
	at org.eclipse.scout.rt.platform.transaction.TransactionProcessor.intercept(TransactionProcessor.java:78)
	at org.eclipse.scout.rt.platform.chain.callable.CallableChain$Chain.continueChain(CallableChain.java:222)
	at org.eclipse.scout.rt.platform.chain.callable.CallableChain.call(CallableChain.java:170)
	at org.eclipse.scout.rt.platform.context.RunContext.call(RunContext.java:158)
	at org.eclipse.scout.rt.platform.context.RunContext.call(RunContext.java:139)
	at org.eclipse.scout.rt.platform.context.RunContext.run(RunContext.java:110)
	at org.eclipse.scout.rt.client.clientnotification.ClientNotificationPoller$P_NotificationPoller.run(ClientNotificationPoller.java:105)
	at org.eclipse.scout.rt.platform.util.concurrent.Callables.lambda$0(Callables.java:31)
	at org.eclipse.scout.rt.platform.chain.callable.CallableChain$Chain.continueChain(CallableChain.java:227)
	at org.eclipse.scout.rt.platform.job.internal.ExceptionProcessor.intercept(ExceptionProcessor.java:41)
	at org.eclipse.scout.rt.platform.chain.callable.CallableChain$Chain.continueChain(CallableChain.java:222)
	at org.eclipse.scout.rt.platform.chain.callable.CallableChain$Chain.continueChain(CallableChain.java:227)
	at org.eclipse.scout.rt.platform.transaction.TransactionProcessor.runTxRequiresNew(TransactionProcessor.java:113)
	at org.eclipse.scout.rt.platform.transaction.TransactionProcessor.runTxRequired(TransactionProcessor.java:142)
	at org.eclipse.scout.rt.platform.transaction.TransactionProcessor.intercept(TransactionProcessor.java:78)
	at org.eclipse.scout.rt.platform.chain.callable.CallableChain$Chain.continueChain(CallableChain.java:222)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/javax.security.auth.Subject.doAs(Subject.java:423)
	at org.eclipse.scout.rt.platform.security.SubjectProcessor.intercept(SubjectProcessor.java:43)
	at org.eclipse.scout.rt.platform.chain.callable.CallableChain$Chain.continueChain(CallableChain.java:222)
	at org.eclipse.scout.rt.platform.chain.callable.CallableChain.call(CallableChain.java:170)
	at org.eclipse.scout.rt.platform.context.RunContext.call(RunContext.java:158)
	at org.eclipse.scout.rt.platform.context.RunContextRunner.intercept(RunContextRunner.java:38)
	at org.eclipse.scout.rt.platform.chain.callable.CallableChain$Chain.continueChain(CallableChain.java:222)
	at org.eclipse.scout.rt.platform.job.internal.CallableChainExceptionHandler.intercept(CallableChainExceptionHandler.java:33)
	at org.eclipse.scout.rt.platform.chain.callable.CallableChain$Chain.continueChain(CallableChain.java:222)
	at org.eclipse.scout.rt.platform.chain.callable.CallableChain.call(CallableChain.java:170)
	at org.eclipse.scout.rt.platform.job.internal.JobFutureTask.lambda$0(JobFutureTask.java:106)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at org.eclipse.scout.rt.platform.job.internal.JobFutureTask.run(JobFutureTask.java:175)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:834)
	at org.eclipse.scout.rt.platform.job.internal.NamedThreadFactory$1.run(NamedThreadFactory.java:63)


There is nothing that belong to my code and more over the client starts well and nothing appear during the first seconds , it means that connection client/server was estalished and then lost.
How can I debug this kind of error and where should I focus.
Many Thanks.

Anis
Re: NullPointer Exception at ServiceTunnelResponse [message #1848624 is a reply to message #1848577] Fri, 10 December 2021 03:18 Go to previous message
Eclipse UserFriend
The nature of this kind of problem is difficult to assess from the outside. My approach would be to analyse the state using break points.

First, identify which element on this specific line is null. Is it "serviceResponse", "serverRunContext" or "serverRunContext.getClientNotificationCollector()".
Then ask yourself, how can this be null? Where does this object come from, and who else could update its value? For example, "serverRunContext" is created by createServiceTunnelRunContext(). By looking at the default implementation you can see that the result can never be null. If it is stil null at runtime, there is probably another implementation of this method. Due to the dynamic nature of dependency injection (@Bean etc.), the code at runtime can be different.

It usually helps if you have a previous version of the application that does not have the problem. By setting up the break points at the right locations you should be able to compare the execution of both versions and find out where they differ.

Regards,
Beat
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