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Date: Tue, 25 Sep 2012 12:15:07 +1100 (NCT)
From: "Allen Wittenauer (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HADOOP-8187) Improve the discovery of the jvm
 library during the build process
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    [ https://issues.apache.org/jira/browse/HADOOP-8187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13462335#comment-13462335 ] 

Allen Wittenauer commented on HADOOP-8187:
------------------------------------------

bq. it seems like a non-portable, Sun-specific way of inferring the location of the JRE

Right.  Which is why I said at that point you'd be porting to different JVMs.  IBM has a similar property (whose name escape me at the moment). We *should* have a fallback method in case we can't find it, the property doesn't exist, whatever.

But my experience at least on a few platforms is that this is significantly more reliable than $JAVA_HOME or doing finds or any of the other weird things we've tried in the past, especially on multi-arch JVMs where multiple libraries are generally present. (The -d param isn't just for decoration, folks...)  

Windows appears to be another (not surprising) outlier.

bq.  Are you suggesting that MacOS users recompile the JDK itself? 

Apple had a special agreement with Sun that resulted in a lot of chaos with regards to file locations and even how to build JNI code in order to fit it into the NeXTSTEP/OpenStep/Darwin mold.  The normal rules do not apply and treating it as such usually ends in tears.  I haven't had a chance to look at Mountain Lion to see if things are any better/more standard.  I'm suspecting not. 
                
> Improve the discovery of the jvm library during the build process
> -----------------------------------------------------------------
>
>                 Key: HADOOP-8187
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8187
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Devaraj Das
>
> Improve the discovery of the jvm library during the build of native libraries/libhdfs/fuse-dfs, etc. A couple of different ways are currently used (discussed in HADOOP-6924). We should clean this part up and also consider builds of native stuff on OSX.

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