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https://issues.apache.org/jira/browse/PIG-939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12752658#action_12752658
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Giridharan Kesavan commented on PIG-939:
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Its not pig which depends on antlr but checkstyle depends on antlr and thats 
the reason antlr is defined under conf="checkstyle->master"
http://mvnrepository.com/artifact/checkstyle/checkstyle/4.2 - has the details 
of checkstyle's transient dependency.

> Checkstyle pulls in junit3.7 which causes the build of test code to fail.
> -------------------------------------------------------------------------
>
>                 Key: PIG-939
>                 URL: https://issues.apache.org/jira/browse/PIG-939
>             Project: Pig
>          Issue Type: Bug
>          Components: build
>    Affects Versions: 0.3.0
>            Reporter: Lee Tucker
>            Assignee: Giridharan Kesavan
>         Attachments: pig-939.patch
>
>
> Pig fails to compile if you execute: 
>     ant -D<associated flags for various components> clean findbugs checkstyle 
> test 
> It gets the error:
>     [javac] Compiling 153 source files to 
> /export/crawlspace/kryptonite/hadoopqa/workspace/workspace/CCDI-Pig-2.3/pig-2.3.0.0.20.0.2967040009/build/test/classes
>     [javac] 
> /export/crawlspace/kryptonite/hadoopqa/workspace/workspace/CCDI-Pig-2.3/pig-2.3.0.0.20.0.2967040009/test/org/apache/pig/test/PigExecTestCase.java:31:
>  cannot find symbol
>     [javac] symbol  : constructor TestCase()
>     [javac] location: class junit.framework.TestCase
>     [javac] public abstract class PigExecTestCase extends TestCase {
>     [javac]                 ^
> Once that's done, there's a copy of junit 3.7 cached from ivy that will 
> continue to cause the build to fail.  It will succeed, if you remove it, and 
> then do:
>     ant -D<associated flags for various components> clean findbugs test
> This proves it's running checkstyle that pulls in junit 3.7

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