[infinispan-issues] [JBoss JIRA] Commented: (ISPN-630) NullPointerException during object unmarshalling

[Galder Zamarreño (JIRA)]

    [ https://jira.jboss.org/browse/ISPN-630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12549291#action_12549291 ] 

Galder Zamarreño commented on ISPN-630:
---------------------------------------

Hmmm, this looks odd. If the code reaches ConstantObjectTable.readObject(), it means that a predefined of the ones in ConstantObjectTable static block is to be read. This means that in theory, at write time a writers.get() returned something other than null. Interestingly enough, neither ConcurrentHashSet nor String are part of the static block, so shouldn't go into that block.

So at first glance, either the writer is writing a predefined externalizer when it isn't which I'd imagine the writer would fail other ways when trying to cast the object to the externalizer target type, or the payload has been corrupted. Alternatively, the readers/writers collections could differ between the node writing it and the node reading it but I can't see how could that happen right now. I suppose same JDK and Infinispan versions are used all around. 

Is this happening at a particular start/stop procedure? Or is it under high load circumstances only? 

Sanne, is it possible for me to somehow run the tests that show this behaviour randomly?

> NullPointerException during object unmarshalling
> ------------------------------------------------
>
>                 Key: ISPN-630
>                 URL: https://jira.jboss.org/browse/ISPN-630
>             Project: Infinispan
>          Issue Type: Bug
>          Components: Marshalling
>    Affects Versions: 4.1.0.Final
>            Reporter: Sanne Grinovero
>            Assignee: Galder Zamarreño
>             Fix For: 4.2.0.BETA1, 5.0.0.BETA1
>
>
> It appears the ExternalizerAdapter was not added to the readers, or that input.readUnsignedByte() reads a wrong identifier value.
> Not easy to reproduce, get this sometimes under load:
> Exception in thread "Scarlet/Lucene service thread index reopening thread-1" java.lang.NullPointerException
> 	at org.infinispan.marshall.jboss.ConstantObjectTable.readObject(ConstantObjectTable.java:253)
> 	at org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:357)
> 	at org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:207)
> 	at org.jboss.marshalling.AbstractUnmarshaller.readObject(AbstractUnmarshaller.java:85)
> 	at org.infinispan.marshall.jboss.GenericJBossMarshaller.objectFromObjectStream(GenericJBossMarshaller.java:162)
> 	at org.infinispan.marshall.VersionAwareMarshaller.objectFromByteBuffer(VersionAwareMarshaller.java:111)
> 	at org.infinispan.marshall.AbstractStreamingMarshaller.objectFromInputStream(AbstractStreamingMarshaller.java:23)
> 	at org.infinispan.loaders.jdbc.JdbcUtil.unmarshall(JdbcUtil.java:88)
> 	at org.infinispan.loaders.jdbc.stringbased.JdbcStringBasedCacheStore.loadLockSafe(JdbcStringBasedCacheStore.java:298)
> 	at org.infinispan.loaders.LockSupportCacheStore.load(LockSupportCacheStore.java:100)
> 	at org.infinispan.loaders.decorators.AbstractDelegatingStore.load(AbstractDelegatingStore.java:86)
> 	at org.infinispan.interceptors.CacheLoaderInterceptor.loadIfNeeded(CacheLoaderInterceptor.java:138)
> 	at org.infinispan.interceptors.CacheLoaderInterceptor.loadIfNeededAndUpdateStats(CacheLoaderInterceptor.java:200)
> 	at org.infinispan.interceptors.CacheLoaderInterceptor.visitGetKeyValueCommand(CacheLoaderInterceptor.java:87)
> 	at org.infinispan.commands.read.GetKeyValueCommand.acceptVisitor(GetKeyValueCommand.java:58)
> 	at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:118)
> 	at org.infinispan.interceptors.base.CommandInterceptor.handleDefault(CommandInterceptor.java:132)
> 	at org.infinispan.commands.AbstractVisitor.visitGetKeyValueCommand(AbstractVisitor.java:87)
> 	at org.infinispan.commands.read.GetKeyValueCommand.acceptVisitor(GetKeyValueCommand.java:58)
> 	at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:118)
> 	at org.infinispan.interceptors.TxInterceptor.enlistReadAndInvokeNext(TxInterceptor.java:171)
> 	at org.infinispan.interceptors.TxInterceptor.visitGetKeyValueCommand(TxInterceptor.java:162)
> 	at org.infinispan.commands.read.GetKeyValueCommand.acceptVisitor(GetKeyValueCommand.java:58)
> 	at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:118)
> 	at org.infinispan.interceptors.CacheMgmtInterceptor.visitGetKeyValueCommand(CacheMgmtInterceptor.java:83)
> 	at org.infinispan.commands.read.GetKeyValueCommand.acceptVisitor(GetKeyValueCommand.java:58)
> 	at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:118)
> 	at org.infinispan.interceptors.InvocationContextInterceptor.handleAll(InvocationContextInterceptor.java:57)
> 	at org.infinispan.interceptors.InvocationContextInterceptor.handleDefault(InvocationContextInterceptor.java:38)
> 	at org.infinispan.commands.AbstractVisitor.visitGetKeyValueCommand(AbstractVisitor.java:87)
> 	at org.infinispan.commands.read.GetKeyValueCommand.acceptVisitor(GetKeyValueCommand.java:58)
> 	at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:118)
> 	at org.infinispan.interceptors.BatchingInterceptor.handleDefault(BatchingInterceptor.java:76)
> 	at org.infinispan.commands.AbstractVisitor.visitGetKeyValueCommand(AbstractVisitor.java:87)
> 	at org.infinispan.commands.read.GetKeyValueCommand.acceptVisitor(GetKeyValueCommand.java:58)
> 	at org.infinispan.interceptors.InterceptorChain.invoke(InterceptorChain.java:273)
> 	at org.infinispan.CacheDelegate.get(CacheDelegate.java:200)
> 	at org.infinispan.lucene.FileListOperations.getFileList(FileListOperations.java:54)
> 	

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