NPE in SubscriptionQueryRequestTarget

Imported from Google Groups
1

Hi,

I found this NPE warning logs coming from axon framework.

log entry:

json_level
WARN

json_logger_name
org.axonframework.axonserver.connector.query.subscription.SubscriptionQueryRequestTarget

json_stack_trace
java.lang.NullPointerException: null

message
Error handling SubscriptionQueryRequest.

We are using AxonServer 4.2.4, AxonFramework 4.2.1

Do you have ideas how is it caused and how can we prevent it?

Thanks

2

Most of the time stack trace is only that first line (which is weird) however lately I found out some logs with

`

java.lang.NullPointerException: null
at org.axonframework.axonserver.connector.query.subscription.SubscriptionQueryRequestTarget.unsubscribe(SubscriptionQueryRequestTarget.java:133)
at org.axonframework.axonserver.connector.query.subscription.SubscriptionQueryRequestTarget.onSubscriptionQueryRequest(SubscriptionQueryRequestTarget.java:95)
at org.axonframework.axonserver.connector.query.AxonServerQueryBus$QueryHandlerProvider$1.lambda$onNext$0(AxonServerQueryBus.java:515)
at java.base/java.util.concurrent.CopyOnWriteArrayList.forEach(CopyOnWriteArrayList.java:804)
at java.base/java.util.concurrent.CopyOnWriteArraySet.forEach(CopyOnWriteArraySet.java:425)
at org.axonframework.axonserver.connector.query.AxonServerQueryBus$QueryHandlerProvider$1.onNext(AxonServerQueryBus.java:515)
at org.axonframework.axonserver.connector.query.AxonServerQueryBus$QueryHandlerProvider$1.onNext(AxonServerQueryBus.java:510)
at org.axonframework.axonserver.connector.util.ResubscribableStreamObserver.onNext(ResubscribableStreamObserver.java:57)
at io.grpc.stub.ClientCalls$StreamObserverToCallListenerAdapter.onMessage(ClientCalls.java:421)
at io.grpc.ForwardingClientCallListener.onMessage(ForwardingClientCallListener.java:33)
at io.grpc.ForwardingClientCallListener.onMessage(ForwardingClientCallListener.java:33)
at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1MessagesAvailable.runInContext(ClientCallImpl.java:519)
at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)

`

Thanks for any ideas.