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https://issues.apache.org/jira/browse/OAK-5915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15902834#comment-15902834
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Thomas Mueller commented on OAK-5915:
-------------------------------------
However it would be good to know what JVM was used, and the JVM options.
The fields are not transient, but because all access is (directly or
indirectly) synchronized, I don't think this is an issue, but who knows. I can
write a special concurrent test case that uses the methods use here (in
segment.ReaderCache), and possibly reproduce this issue using randomized
operations.
> NPE in LIRS cache
> -----------------
>
> Key: OAK-5915
> URL: https://issues.apache.org/jira/browse/OAK-5915
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: cache, core
> Affects Versions: 1.8
> Reporter: Michael Dürig
> Assignee: Thomas Mueller
> Fix For: 1.8
>
>
> While experimenting with a snapshot of a production repository I hit an
> {{NPE}} in the LIRS cache:
> {noformat}
> java.lang.NullPointerException
>
> org.apache.jackrabbit.oak.cache.CacheLIRS$Segment.removeFromStack(CacheLIRS.java:1333)
> org.apache.jackrabbit.oak.cache.CacheLIRS$Segment.access(CacheLIRS.java:907)
> org.apache.jackrabbit.oak.cache.CacheLIRS$Segment.get(CacheLIRS.java:880)
> org.apache.jackrabbit.oak.cache.CacheLIRS.getIfPresent(CacheLIRS.java:372)
> org.apache.jackrabbit.oak.segment.ReaderCache.get(ReaderCache.java:116)
>
> org.apache.jackrabbit.oak.segment.CachingSegmentReader.readString(CachingSegmentReader.java:90)
> org.apache.jackrabbit.oak.segment.Segment.readTemplate(Segment.java:567)
>
> org.apache.jackrabbit.oak.segment.CachingSegmentReader$2.apply(CachingSegmentReader.java:118)
>
> org.apache.jackrabbit.oak.segment.CachingSegmentReader$2.apply(CachingSegmentReader.java:114)
> org.apache.jackrabbit.oak.segment.ReaderCache.get(ReaderCache.java:118)
>
> org.apache.jackrabbit.oak.segment.CachingSegmentReader.readTemplate(CachingSegmentReader.java:114)
>
> org.apache.jackrabbit.oak.segment.SegmentNodeState.getTemplate(SegmentNodeState.java:102)
>
> org.apache.jackrabbit.oak.segment.SegmentNodeState.getChildNodeEntries(SegmentNodeState.java:439)
> {noformat}
> Unfortunately no further information or ways to reproduce this.
> FYI [~tmueller]
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