[jira] Commented: (DERBY-2141) BlobClob4BlobTest.testPositionBlob() fails with NullPointerException

["Knut Anders Hatlen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DERBY-2141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12493928 ] 

Knut Anders Hatlen commented on DERBY-2141:
-------------------------------------------

I think these errors are caused by the lack of synchronization between the finalization thread and the user thread. For LOBs that are not materialized in memory, the finalizers of EmbedBlob and EmbedClob call OverflowInputStream.closeStream() which again calls BaseContainerHandle.close(). Since the finalization thread doesn't synchronize on the connection synchronization object, the user thread and the finalization thread might run BaseContainerHandle.close() concurrently on the same object.

> BlobClob4BlobTest.testPositionBlob() fails with NullPointerException
> --------------------------------------------------------------------
>
>                 Key: DERBY-2141
>                 URL: https://issues.apache.org/jira/browse/DERBY-2141
>             Project: Derby
>          Issue Type: Bug
>          Components: Regression Test Failure
>    Affects Versions: 10.3.0.0
>         Environment: Java SE 6, Java SE 5.0 (less frequently). Linux.
>            Reporter: Knut Anders Hatlen
>            Priority: Minor
>         Attachments: stacktrace.diff
>
>
> Seen in the nightly regression tests:
> http://dbtg.thresher.com/derby/test/Daily/jvm1.6/testing/testlog/lin/481811-org.apache.derbyTesting.functionTests.suites.All_diff.txt
> http://dbtg.thresher.com/derby/test/Daily/jvm1.6/testing/testlog/lin/480626-org.apache.derbyTesting.functionTests.suites.All_diff.txt

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