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http://jira.codehaus.org/browse/MJAR-105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=131099#action_131099
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Joerg Schaible commented on MJAR-105:
-------------------------------------
In your example, the resulting jar is not empty. Looking for the differences to
your example and my setup I found that we use this configuration for the plugin:
{noformat}
<configuration>
<!-- Remove the Maven POM from the Manifest -->
<archive>
<addMavenDescriptor>false</addMavenDescriptor>
</archive>
</configuration>
{noformat}
Add this configuration to your example and the problem is also revealed :)
> Regression: Build fails for an empty main jar with 2.2
> ------------------------------------------------------
>
> Key: MJAR-105
> URL: http://jira.codehaus.org/browse/MJAR-105
> Project: Maven 2.x Jar Plugin
> Issue Type: Bug
> Affects Versions: 2.2
> Reporter: Joerg Schaible
> Attachments: MJAR-105.zip
>
>
> We have quite some projects with integration tests that have only test code,
> but no sources (neither Java nor other resources) that are included into the
> main artifact. With jar-plugin version 2.2 these kind of projects suddenly
> fail:
> {noformat}
> [INFO]
> ------------------------------------------------------------------------
> [INFO] Building eIP TempAccess Integration Tests
> [INFO] task-segment: [clean, deploy]
> [INFO]
> ------------------------------------------------------------------------
> [INFO] [clean:clean]
> [INFO] Deleting directory
> D:\work\standard\eIP\TempAccess\EnterpriseArchive\integration-test-jar\target
> [INFO] [resources:resources]
> [INFO] Using default encoding to copy filtered resources.
> [INFO] [compiler:compile]
> [INFO] No sources to compile
> [INFO] [resources:testResources]
> [INFO] Using default encoding to copy filtered resources.
> [INFO] [compiler:testCompile]
> [INFO] Compiling 1 source file to
> D:\work\standard\eIP\TempAccess\EnterpriseArchive\integration-test-jar\target\test-classes
> [INFO] [surefire:test]
> [INFO] Tests are skipped.
> [INFO] [jar:jar]
> [WARNING] JAR will be empty - no content was marked for inclusion!
> [INFO]
> ------------------------------------------------------------------------
> [ERROR] BUILD ERROR
> [INFO]
> ------------------------------------------------------------------------
> [INFO] Error assembling JAR
> Embedded error: You must set at least one file.
> [INFO]
> ------------------------------------------------------------------------
> [INFO] For more information, run Maven with the -e switch
> [INFO]
> ------------------------------------------------------------------------
> [INFO] Total time: 14 minutes 44 seconds
> [INFO] Finished at: Wed Apr 16 08:18:43 CEST 2008
> [INFO] Final Memory: 111M/200M
> [INFO]
> ------------------------------------------------------------------------
> {noformat}
> With 2.1 an empty main jar has been created and this behaviour was explicitly
> acknowledged in MJAR-8.
> We stumbled about this upgrading from M205 to M209 that allowed us to use
> also the newer jar-plugin version. Currently we're stuck with jar-plugin
> version 2.1 because of this.
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