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https://issues.apache.org/jira/browse/HADOOP-8419?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15011352#comment-15011352
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Tsuyoshi Ozawa commented on HADOOP-8419:
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Backported this to branch-2 for targeting 2.8.0.
> GzipCodec NPE upon reset with IBM JDK
> -------------------------------------
>
> Key: HADOOP-8419
> URL: https://issues.apache.org/jira/browse/HADOOP-8419
> Project: Hadoop Common
> Issue Type: Bug
> Components: io
> Affects Versions: 1.0.3
> Reporter: Luke Lu
> Assignee: Yu Li
> Labels: gzip, ibm-jdk
> Fix For: 1.1.2, 2.0.5-alpha, 2.8.0
>
> Attachments: HADOOP-8419-branch-1.patch,
> HADOOP-8419-branch1-v2.patch, HADOOP-8419-trunk-v2.patch,
> HADOOP-8419-trunk.patch
>
>
> The GzipCodec will NPE upon reset after finish when the native zlib codec is
> not loaded. When the native zlib is loaded the codec creates a
> CompressorOutputStream that doesn't have the problem, otherwise, the
> GZipCodec uses GZIPOutputStream which is extended to provide the resetState
> method. Since IBM JDK 6 SR9 FP2 including the current JDK 6 SR10,
> GZIPOutputStream#finish will release the underlying deflater, which causes
> NPE upon reset. This seems to be an IBM JDK quirk as Sun JDK and OpenJDK
> doesn't have this issue.
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