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https://issues.apache.org/jira/browse/MAPREDUCE-1146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12791469#action_12791469
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Doug Cutting commented on MAPREDUCE-1146:
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Sending a question to an Eclipse user list and waiting a day seems easy enough. 
 Would that suffice, Chris?  I searched the web and found references to this 
kind of problem, but most suggest using the Eclipse GUI to manually fix the 
classpath and none mention an automated means to fix a tools.jar-containing 
.classpath file for OS-X.  Maven will generate an Eclipse .classpath 
automatically, but folks seem to frequently have trouble with this on OS-X when 
the classpath contains tools.jar and no automated solution is offered.

Looking at the patch, my preference would be to name things after what they do. 
 So I'd name the markers in the file SKIP_TOOLS_BEGIN and SKIP_TOOLS_END, and 
the ant target "set-eclipse-skip-tools-jar", and the ant properties 
"eclipse.skip.tools.jar.{begin,end}".  These will currently only be set on OS-X.


> Sqoop dependencies break Ecpilse build on Linux
> -----------------------------------------------
>
>                 Key: MAPREDUCE-1146
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1146
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: contrib/sqoop
>         Environment: Linux, Sun JDK6
>            Reporter: Konstantin Boudnik
>            Assignee: Aaron Kimball
>         Attachments: MAPREDUCE-1146.2.patch, MAPREDUCE-1146.3.patch, 
> MAPREDUCE-1146.patch
>
>
> Under  Linux there's the error in the Eclipse "Problems" view:
> {noformat}
> - "com.sun.tools cannot be resolved" at line 166 of  
> org.apache.hadoop.sqoop.orm.CompilationManager
> {noformat}
> The problem doesn't appear on MacOS though

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