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From "Marshall Schor (JIRA)" <...@uima.apache.org>
Subject [jira] [Resolved] (UIMA-2966) m2e builds potential conflict when doing Jars with maven
Date Thu, 13 Jun 2013 14:52:21 GMT

     [ https://issues.apache.org/jira/browse/UIMA-2966?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Marshall Schor resolved UIMA-2966.
----------------------------------

    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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