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https://issues.apache.org/jira/browse/SLIDER-1005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15053606#comment-15053606
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Steve Loughran commented on SLIDER-1005:
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I'd still like to have that generated-sources under src/main and src/test, with 
maven set up (a few extra lines) to grab the files, and the build to put it in 
there a profile. Same for the avro bits.

why? 
# protoc is an extra pain in the build, especially on windows
# IDEs can't find the files unless you do the build/rebuild, and it gets 
complex when switching branches
# we don't change the build much

having them all in a separate dir marked generated should be enough to warn 
people not to edit

> The java code generated by protobuf should not be placed in src directory
> -------------------------------------------------------------------------
>
>                 Key: SLIDER-1005
>                 URL: https://issues.apache.org/jira/browse/SLIDER-1005
>             Project: Slider
>          Issue Type: Improvement
>          Components: build, core
>    Affects Versions: Slider 0.90
>         Environment: Centos 6.5, Maven 3.2.5
>            Reporter: Pan Yuxuan
>            Assignee: Pan Yuxuan
>            Priority: Minor
>         Attachments: SLIDER-1005-001.patch
>
>
> Now slider using protobuf for RPC, but the output directory is 
> <output>${basedir}/src/main/java</output> in slider-core/pom.xml. That means 
> the generated java code was been placed in the src directory.
> I have seen the generated java code for protobuf in Hadoop, they put the code 
> in build directory 
> <output>${project.build.directory}/generated-sources/java</output>. And they 
> put the compile-protoc in <plugin> not <profile> in the pom.xml.
> I think the way Hadoop used is more reasonable. The code is generated by 
> protobuf, not by ourselves.



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