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From: "Shah, Sumit (CGI Federal)" <Sumit.Shah@cgifederal.com>
To: "users@jackrabbit.apache.org" <users@jackrabbit.apache.org>
Date: Sun, 19 Jun 2011 01:31:32 -0400
Subject: NPE: ConcurrentCache
Thread-Topic: NPE: ConcurrentCache
Thread-Index: AcwuQiWURqD/oe8nTDm5Xqg37Kzvvw==
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All,

I am getting the following exception when trying to add anode. It goes from=
 being sporadic to consistent back to sporadic.

java.lang.NullPointerException
        at org.apache.jackrabbit.core.cache.ConcurrentCache$E.access$000(Co=
ncurrentCache.java:47)
        at org.apache.jackrabbit.core.cache.ConcurrentCache$1.removeEldestE=
ntry(ConcurrentCache.java:70)
        at java.util.LinkedHashMap.putImpl(LinkedHashMap.java:409)
        at java.util.LinkedHashMap.put(LinkedHashMap.java:370)
        at org.apache.jackrabbit.core.cache.ConcurrentCache.put(ConcurrentC=
ache.java:168)
        at org.apache.jackrabbit.core.state.MLRUItemStateCache.cache(MLRUIt=
emStateCache.java:83)
        at org.apache.jackrabbit.core.state.ItemStateReferenceCache.cache(I=
temStateReferenceCache.java:169)

I researched this error a little bit, it seems like the exact same issue wa=
s reported as a Jackrabbit bug [1], which was attributed to a version of th=
e IBM JDK. Apparently it is a bug with the IBM JDK [2]. Although the IBM bu=
g says it affects Websphere users, but it's a bug with their JDK and I am i=
nclined to think it would affect all users of that version of the IBM JDK.

We are running Jackrabbit 2.2.5 deployed in Weblogic running on AIX with IB=
M JDK. I would appreciate if someone knows more details or could suggest a =
workaround/resolution.

Thanks
Sumit

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