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https://issues.apache.org/jira/browse/UIMA-2966?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marshall Schor resolved UIMA-2966.
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Resolution: Fixed
> m2e builds potential conflict when doing Jars with maven
> --------------------------------------------------------
>
> Key: UIMA-2966
> URL: https://issues.apache.org/jira/browse/UIMA-2966
> Project: UIMA
> Issue Type: Improvement
> Components: Build, Packaging and Test
> Affects Versions: parent-pom-4
> Reporter: Marshall Schor
> Assignee: Marshall Schor
> Priority: Minor
> Fix For: parent-pom-5
>
>
> The m2e integration in Eclipse for Maven does incremental builds as needed.
> One side effect of these is to create in
> target/classes/META-INF/maven/[groupId]/[artifactId] the two files: pom.xml
> and pom.properties.
> When the normal Maven Jar plugin runs, it uses an archiver configuration
> which (by default) has the addMavenDescriptor set to true. This causes the
> archiver 1) archive everything in target/classes (including the META-INF/...
> that m2e may have built), and then it adds its own pom.xml and
> pom.properties, in the same place as the m2e did.
> The result is the zip file has a directory that actually has 2 copies of
> these two files.
> (Note, this won't happen if you build from the command line using "mvn clean
> install" - the "clean" step will delete the target/ before building).
> Normally, having multiple files in a directory inside a Jar doesn't matter to
> anyone. However, the build for Eclipse Update Sites runs the packager which
> includes (re)packing the Jar files to compress better, and this, in turn,
> runs some Zip thing which throws an exception if it finds 2 files with the
> same name in a directory.
> The easy workaround is to always use mvn clean before install.
> It should be easy to fix this, though - by having a step run ahead of the Jar
> plugin which deletes these two files (if they exist). I think that would be
> "safer" in that things would always work... Right now, if by chance you
> forget to do clean, and are using m2e, the Jars get built in this funny way,
> and nothing notices, until much later, if you try and include these Jars as
> part of "runtime" Jar in an Eclipse Update site.
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