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From "Konstantin Boudnik (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-798) Exclude second Ant JAR from classpath in hdfs builds
Date Fri, 25 Feb 2011 06:12:38 GMT

    [ https://issues.apache.org/jira/browse/HDFS-798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12999229#comment-12999229
] 

Konstantin Boudnik commented on HDFS-798:
-----------------------------------------

bq. I now worry that ant core is needed for the eclipse javac compiler that jsp2.1 uses
Steve, I won't be able to tell if you if this patch is breaking anything in Eclipse or not
- I am not using Eclipse for anything. So, if you use it - please verify if the patch works
for you?

bq. ensure that the version of ant that is added is the same version that the project is built
with.

I am not sure if Ivy allows to override version of a transitive dependency. Maven sure does.

> Exclude second Ant JAR from classpath in hdfs builds
> ----------------------------------------------------
>
>                 Key: HDFS-798
>                 URL: https://issues.apache.org/jira/browse/HDFS-798
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: build
>    Affects Versions: 0.22.0
>            Reporter: Steve Loughran
>            Assignee: Konstantin Boudnik
>            Priority: Minor
>         Attachments: HDFS-798.patch
>
>
> I've no evidence that this is a problem, but I have known it to be in different projects:
> {code}
>     [junit] WARNING: multiple versions of ant detected in path for junit 
>     [junit]          jar:file:/Users/slo/Java/Apache/ant/lib/ant.jar!/org/apache/tools/ant/Project.class
>     [junit]      and jar:file:/Users/slo/.ivy2/cache/ant/ant/jars/ant-1.6.5.jar!/org/apache/tools/ant/Project.class
> {code}
> Somehow Ivy needs to be set up to skip pulling in an old version of Ant in the build
-both paranamer-ant and jsp-2.1 declare a dependency on it. If both tools are only ever run
under Ant, the ivy.xml file could exclude it, the build file just has to make sure that Ant's
own classpath gets passed down.

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