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https://issues.apache.org/jira/browse/HDFS-798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12998797#comment-12998797
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Steve Loughran commented on HDFS-798:
-------------------------------------
That will eliminate the complaint, but I now worry that ant core is needed for
the eclipse javac compiler that jsp2.1 uses. It may be safest to ignore the
complaint to ensure that the runtimes are set up right, and ensure that the
version of ant that is added is the same version that the project is built with.
FWIW, my ivy dependencies for jsp do pull in a version of ant, so that it gets
passed down the chain, with a separate JSP config that includes everything that
JSP pages need:
{noformat}
<dependency org="org.mortbay.jetty"
name="jetty"
rev="${jetty.version}"
conf="compile->master;redist->master"/>
<dependency org="org.mortbay.jetty"
name="jetty-util"
rev="${jetty.version}"
conf="compile->master;redist->master"/>
<!-- logging-->
<dependency org="org.smartfrog"
name="sf-loggingservices"
changing="true"
rev="latest.integration"
conf="compile,runtime,jsp->default;redist->redist"/>
<!--JSP support -->
<dependency org="org.mortbay.jetty"
name="jsp-2.1"
rev="${jetty.jsp.version}"
conf="jsp->master"/>
<dependency org="org.mortbay.jetty"
name="jsp-api-2.1"
rev="${jetty.jsp.version}"
conf="jsp->master"/>
<dependency org="commons-el"
name="commons-el"
rev="${commons-el.version}"
conf="jsp->master"/>
<!--this is the compiler stage-->
<dependency org="org.smartfrog"
name="sf-ant"
rev="latest.integration"
conf="jsp->default"/>
<dependency org="org.eclipse.jdt"
name="core"
rev="${org.eclipse.jdt.core.version}"
conf="jsp->master"/>
{noformat}
> 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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