[infinispan-issues] [JBoss JIRA] (ISPN-8721) Clustered 2nd level cache sometimes throws NullPointerException when new node starts up

[Tom Dearman (JIRA)]

Tom Dearman created ISPN-8721:
---------------------------------

             Summary: Clustered 2nd level cache sometimes throws NullPointerException when new node starts up
                 Key: ISPN-8721
                 URL: https://issues.jboss.org/browse/ISPN-8721
             Project: Infinispan
          Issue Type: Bug
          Components: Hibernate Cache
    Affects Versions: 9.1.4.Final
         Environment: jvm 1.8
            Reporter: Tom Dearman
         Attachments: sample-app.cache.tar.gz

There is a race condition in PutFromLoadValidator as it registers itself in the component registry before it is fully initialised. You can reproduce this by running the contained app against h2 server db. First start this app with default port. Then start the app on port '8080' and make a few requests to '/add' to create data. After that send continuous requests to '/update' in order change data and trigger the cache:
for i in

{1..1000}
; do sleep 0.01; curl http://localhost:8080/update -X POST; done
Then start another instance of the app on port 8090:
java -jar test-app-0.0.1-SNAPSHOT.jar --server.port=8090
Most of the time one of the updates will fail and the logs will show the following:

2018-01-23 15:36:46 [main] DEBUG o.h.c.i.access.PutFromLoadValidator - Interceptor chain was: [org.infinispan.interceptors.InvocationContextInterceptor at 407a7f2a, org.infinispan.interceptors.locking.NonTransactionalLockingInterceptor at 4ea5b703, org.infinispan.interceptors.EntryWrappingInterceptor at 2a7ed1f, org.infinispan.interceptors.InvalidationInterceptor at 3fa247d1, org.infinispan.interceptors.CallInterceptor at 2cb2fc20]
2018-01-23 15:36:46 [main] DEBUG o.h.c.i.access.PutFromLoadValidator - New interceptor chain is: [org.infinispan.interceptors.InvocationContextInterceptor at 407a7f2a, org.infinispan.interceptors.locking.NonTransactionalLockingInterceptor at 4ea5b703, org.hibernate.cache.infinispan.access.NonTxPutFromLoadInterceptor at 495ee280, org.infinispan.interceptors.EntryWrappingInterceptor at 2a7ed1f, org.hibernate.cache.infinispan.access.NonTxInvalidationInterceptor at 4fa1c212, org.infinispan.interceptors.CallInterceptor at 2cb2fc20]
2018-01-23 15:36:46 [main] TRACE o.i.manager.DefaultCacheManager - About to wire and start cache test.app.data.User-pending-puts
2018-01-23 15:36:46 [remote-thread--p2-t1] ERROR o.i.i.InvocationContextInterceptor - ISPN000136: Error executing command BeginInvalidationCommand, writing keys test.app.data.User#2
java.lang.NullPointerException: null
at org.hibernate.cache.infinispan.access.PutFromLoadValidator.beginInvalidatingWithPFER(PutFromLoadValidator.java:561)
at org.hibernate.cache.infinispan.access.PutFromLoadValidator.beginInvalidatingKey(PutFromLoadValidator.java:555)
at org.hibernate.cache.infinispan.access.NonTxPutFromLoadInterceptor.visitInvalidateCommand(NonTxPutFromLoadInterceptor.java:70)
at org.infinispan.commands.write.InvalidateCommand.acceptVisitor(InvalidateCommand.java:114)
at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:99)
at org.infinispan.interceptors.locking.AbstractLockingInterceptor.visitInvalidateCommand(AbstractLockingInterceptor.java:112)
at org.infinispan.commands.write.InvalidateCommand.acceptVisitor(InvalidateCommand.java:114)
at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:99)
at org.infinispan.interceptors.InvocationContextInterceptor.handleAll(InvocationContextInterceptor.java:110)
at org.infinispan.interceptors.InvocationContextInterceptor.handleDefault(InvocationContextInterceptor.java:79)
at org.infinispan.commands.AbstractVisitor.visitInvalidateCommand(AbstractVisitor.java:127)
at org.infinispan.commands.write.InvalidateCommand.acceptVisitor(InvalidateCommand.java:114)
at org.infinispan.interceptors.InterceptorChain.invoke(InterceptorChain.java:335)
at org.infinispan.commands.remote.BaseRpcInvokingCommand.processVisitableCommand(BaseRpcInvokingCommand.java:43)
at org.infinispan.commands.remote.SingleRpcCommand.perform(SingleRpcCommand.java:51)
at org.infinispan.remoting.inboundhandler.BasePerCacheInboundInvocationHandler.invokePerform(BasePerCacheInboundInvocationHandler.java:92)
at org.infinispan.remoting.inboundhandler.BaseBlockingRunnable.run(BaseBlockingRunnable.java:34)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
2018-01-23 15:36:47 [main] TRACE o.i.manager.DefaultCacheManager - Closing latch for cache test.app.data.User-pending-puts



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