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https://issues.apache.org/jira/browse/MTOMCAT-208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13581269#comment-13581269
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Richard commented on MTOMCAT-208:
---------------------------------
This should only affect the tomcat7-maven-plugin, I don't think tomcat6
supports embedding.
> JaCoCo instrumentation errors when running StandaloneWarMojo
> ------------------------------------------------------------
>
> Key: MTOMCAT-208
> URL: https://issues.apache.org/jira/browse/MTOMCAT-208
> Project: Apache Tomcat Maven Plugin
> Issue Type: Improvement
> Components: tomcat6, tomcat7
> Affects Versions: 2.1
> Reporter: Tim Astle
> Assignee: Olivier Lamy (*$^¨%`£)
> Fix For: 2.1
>
> Attachments: StandaloneWarMojo.java.patch, tomcat-maven-plugin.patch
>
>
> We've run into issues with using the plugin with jacoco for code coverage
> getting instrumentation errors on classes (saying they've already been
> instrumented). We found that this was due to how the exec-war and
> standalone-war goals work because they fork and start a new package phase (at
> least from what I've read that's what they're doing), so it's getting
> executed twice and the second time when it tries to instrument the classes it
> gets the errors. I found this doesn't occur with the exec-war-only goal, so
> I updated the StandaloneWarMojo class to not have the @Execute(phase =
> LifeCyclePhase.PACKAGE) annotation on it and that appeared to resolve the
> issue. Not sure if it would make more sense to add another goal such as
> 'standalone-war-only' and keep the existing standalone-war or not.
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