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Date: Wed, 29 Aug 2012 12:47:08 +1100 (NCT)
From: "Colin Patrick McCabe (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HADOOP-8737) cmake: always use JAVA_HOME to
 find libjvm.so, jni.h, jni_md.h
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    [ https://issues.apache.org/jira/browse/HADOOP-8737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13443731#comment-13443731 ] 

Colin Patrick McCabe commented on HADOOP-8737:
----------------------------------------------

I am going to post a new version of the patch that surrounds this code in
{code}
IF("${CMAKE_SYSTEM}" MATCHES "Linux")
{code}

On non-Linux platforms, we can fall back on the old method of detecting JNI installations.

Allen, I believe this will address your concerns.
                
> cmake: always use JAVA_HOME to find libjvm.so, jni.h, jni_md.h
> --------------------------------------------------------------
>
>                 Key: HADOOP-8737
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8737
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: native
>    Affects Versions: 2.2.0-alpha
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>            Priority: Minor
>         Attachments: HADOOP-8737.001.patch
>
>
> We should always use the {{libjvm.so}}, {{jni.h}}, and {{jni_md.h}} under {{JAVA_HOME}}, rather than trying to look for them in system paths.  Since we compile with Maven, we know that we'll have a valid {{JAVA_HOME}} at all times.  There is no point digging in system paths, and it can lead to host contamination if the user has multiple JVMs installed.

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