[jira] [Commented] (HADOOP-9489) Eclipse instructions in BUILDING.txt don't work

["Robert Joseph Evans (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-9489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13638027#comment-13638027 ] 

Robert Joseph Evans commented on HADOOP-9489:
---------------------------------------------

I am not really sure that we want to require m2eclipse plug-in.  It the past using mvn eclipse:eclipse and the m2plugin caused conflicts with one another, although recently there have not been as many issues with that.  

http://maven.apache.org/plugins/maven-eclipse-plugin/

has instructions on how to use the maven-eclipse-plugin.  This is what is run when you run eclipse:eclipse.  You can set M2_REPO manually inside eclipse, or you can run mvn eclipse:configure-workspace to set the M2_REPO. Please refer to

http://maven.apache.org/plugins/maven-eclipse-plugin/configure-workspace-mojo.html

for more details about that command because you may need to define some other parameters on the command line to make it work properly with your environment.
                
> Eclipse instructions in BUILDING.txt don't work
> -----------------------------------------------
>
>                 Key: HADOOP-9489
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9489
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: build
>    Affects Versions: 3.0.0
>            Reporter: Carl Steinbach
>            Assignee: Chris Nauroth
>         Attachments: eclipse_hadoop_errors.txt, HADOOP-9489.1.patch
>
>
> I have tried several times to import Hadoop trunk into Eclipse following the instructions in the BUILDING.txt file, but so far have not been able to get it to work.
> If I use a fresh install of Eclipse 4.2.2, Eclipse will complain about an undefined M2_REPO environment variable. I discovered that this is defined automatically by the M2Eclipse plugin, and think that the BUILDING.txt doc should be updated to explain this.
> After installing M2Eclipse I tried importing the code again, and now get over 2500 errors related to missing class dependencies. Many of these errors correspond to missing classes in the oah*.proto namespace, which makes me think that 'mvn eclipse:eclipse' is not triggering protoc. 

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