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https://issues.apache.org/jira/browse/JCR-3466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13505328#comment-13505328
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Marcel Reutegger commented on JCR-3466:
---------------------------------------
This is what happens:
- a thread triggers committing of pending changes in AbstractIndex.addDocument()
- the pooled threads start to invert the documents
- the calling thread is interrupted and does not clear the pending Map in
VolatileIndex.commitPending()
- another thread will commit those pending documents again, but now the
SingletonTokenStream in those documents may already be closed.
I think it would be better to wait for the CountDownLatch again even if the
calling thread is interrupted.
> NPE in SingletonTokenStream
> ---------------------------
>
> Key: JCR-3466
> URL: https://issues.apache.org/jira/browse/JCR-3466
> Project: Jackrabbit Content Repository
> Issue Type: Bug
> Components: jackrabbit-core
> Affects Versions: 2.4
> Reporter: Marcel Reutegger
> Assignee: Marcel Reutegger
> Priority: Minor
>
> Occasionally I see a NPE in SingletonTokenStream when the thread triggering
> the index update is interrupted:
> Exception in thread "DynamicPooledExecutor" java.lang.NullPointerException
> at
> org.apache.jackrabbit.core.query.lucene.SingletonTokenStream.incrementToken(SingletonTokenStream.java:89)
> at
> org.apache.lucene.index.DocInverterPerField.processFields(DocInverterPerField.java:141)
> at
> org.apache.lucene.index.DocFieldProcessorPerThread.processDocument(DocFieldProcessorPerThread.java:276)
> at
> org.apache.lucene.index.DocumentsWriter.updateDocument(DocumentsWriter.java:766)
> at
> org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:2060)
> at
> org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:2034)
> at
> org.apache.jackrabbit.core.query.lucene.AbstractIndex$1.run(AbstractIndex.java:198)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:662)
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