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https://issues.apache.org/jira/browse/HADOOP-9205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13553707#comment-13553707
 ] 

Ivan A. Veselovsky commented on HADOOP-9205:
--------------------------------------------

Shortest way to reproduce the issue:
Run test org.apache.hadoop.util.TestNativeCodeLoader with 
-Drequire.test.libhadoop=true and 
env variable 
LD_LIBRARY_PATH=.../hadoop-common/hadoop-common-project/hadoop-common/target/native/target/usr/local/lib
If you're running on Java 1.6, the test passes.
If you're running on Java 1.7, the test fails.
If we add parameter
-Djava.library.path=.../hadoop-common/hadoop-common-project/hadoop-common/target/native/target/usr/local/lib
 , the test passes on both 1.6 and 1.7.

This is reproducible with Oracle's JDK jdk1.7.0_07, jdk1.7.0_10, but is *not* 
reproducible with jdk1.7.0_05, so Kihwall's observation regarding 1.7.0_05 is 
correct.
                
> Java7: path to native libraries should be passed to tests via 
> -Djava.library.path rather than env.LD_LIBRARY_PATH
> -----------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-9205
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9205
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 3.0.0, 2.0.3-alpha, 0.23.6
>            Reporter: Ivan A. Veselovsky
>            Assignee: Ivan A. Veselovsky
>         Attachments: HADOOP-9205.patch
>
>
> Currently the path to native libraries is passed to unit tests via 
> environment variable LD_LIBRARTY_PATH. This is okay for Java6, but does not 
> work for Java7, since Java7 ignores this environment variable.
> So, to run the tests with native implementation on Java7 one needs to pass 
> the paths to native libs via -Djava.library.path system property rather than 
> the LD_LIBRARY_PATH env variable.
> The suggested patch fixes the problem via setting the paths to native libs 
> using both LD_LIBRARY_PATH and -Djava.library.path property. This way the 
> tests work equally on both Java6 and Java7.

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