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From "Gregory Shimansky (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-5145) [drlvm][gc] intermittent NPE in annotation tests
Date Fri, 25 Jan 2008 21:58:34 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-5145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12562705#action_12562705
] 

Gregory Shimansky commented on HARMONY-5145:
--------------------------------------------

I believe this is a coincidence, but the same set of tests fail for me with a patch for JET
that enables lazy resolution in -Dtest.mode=jet. The patch is located here https://issues.apache.org/jira/secure/attachment/12374089/lazy.patch


The patch is most likely not yet correct, so HW NPE may be happening because of a bug. But
it is interesting that it causes the same tests to fail and failure is reproducible in 100%
of runs. Maybe fixing this NPE may give a pointer why the intermittent bug happens.

> [drlvm][gc] intermittent NPE in annotation tests
> ------------------------------------------------
>
>                 Key: HARMONY-5145
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5145
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>         Environment: Windows, Linux (x86_64 only ?)
>            Reporter: Alexey Varlamov
>            Assignee: Xiao-Feng Li
>
> Kernel tests fail intermittently with NPE, the top of stacktrace is always the same:
> java.lang.NullPointerException   
>  at java.lang.reflect.Proxy.newProxyInstance(Proxy.java:200)   
>  at org.apache.harmony.lang.annotation.AnnotationFactory.createAnnotation(AnnotationFactory.java:101)
  
> Brief review of j.l.reflect.Proxy code shows that possible reason of failure are nullified
WeakReferences to proxy classes in interfaceCache. 

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