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https://issues.apache.org/jira/browse/OPENJPA-915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13677021#comment-13677021
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Albert Lee commented on OPENJPA-915:
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Enhancement process is to insert JPA "magics" into the entity class byte
stream. Using container managed or javaagent can perform this transformation on
the fly during an entity class loading process. Otherwise, build time
enhancement of dependent entity super class requires the build process to
expand the depending jar file content, run the enhancer and zip it back up.
This is only require for a one-time processing.
> PCEnhancer cannot enhance an entity bean in a jar
> -------------------------------------------------
>
> Key: OPENJPA-915
> URL: https://issues.apache.org/jira/browse/OPENJPA-915
> Project: OpenJPA
> Issue Type: Improvement
> Environment: linux, java 1.6.0_12
> Reporter: Adam Hardy
>
> The PCEnhancer fails when trying to enhance an entity bean found in a jar. It
> tries and fails to write the enhanced class output to the jar rather than the
> build directory of the project.
> This means I cannot have my entity bean superclass in a seperate
> framework-centric project for re-use by all JPA-based projects, unless I
> enhance the class when jarring up the framework project. This would prevent
> me from sharing the jar with other JPA-based projects which don't use
> OpenJPA.
> I would recommend that the PCEnhancer checks the file path to write the
> enhanced class to before writing and removes any Jar-prefix if present,
> writing the class to the normal build directory.
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