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https://issues.apache.org/jira/browse/OPENJPA-1382?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12778406#action_12778406
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Pinaki Poddar commented on OPENJPA-1382:
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Hi,
The option to plug meta-data generator tool as a service has been considered.
But it was not activated it because we did not know how the users will react if
pure javac compilation with OpenJPA library in compiler classpath starts
generating a bunch of MyEntity_.java files.
Our assumption is only a handful of brave users will start experimenting
with new Criteria API and a subset of them will use the typesafe version that
requires these automatically generated canonical classes. That is why, the
automatic generation is not activated as service.
But one is always wrong in making any assumption on usage pattern :)
About location of the generated sources:
Our first preference was to generate the new MyEnity_.java files in the same
directory as in MyEntity.java, by default.
But it is not obvious how to determine the directory location of a *.java
files in the context an AnnotationProcessor is invoked. Nor the ways to access
the javac options such as -sourcepath etc.
After a discussion in this regard [1] and some basic experiments, I
concluded that the location of MyEntity.java can only be determined with a
specialized API in Sun JDK. Based on that observation, the default location of
the generated files are current directory (for non-Sun JDK) and the directory
of the original source for Sun JDK.
[1] http://forums.sun.com/thread.jspa?threadID=5398594&tstart=0
> make org.apache.openjpa.persistence.meta.AnnotationProcessor6 as service
> ------------------------------------------------------------------------
>
> Key: OPENJPA-1382
> URL: https://issues.apache.org/jira/browse/OPENJPA-1382
> Project: OpenJPA
> Issue Type: Improvement
> Components: integration, tooling
> Affects Versions: 2.0.0-M3
> Environment: windows XP,sun jdk6
> Reporter: zhouyanming
> Assignee: Pinaki Poddar
> Fix For: 2.0.0
>
>
> please add a file named "javax.annotation.processing.Processor" to
> META-INF/services
> file content is org.apache.openjpa.persistence.meta.AnnotationProcessor6
> otherwise we need specific classname use -processor argument
> reduce
> javac -processorpath openjpa-all-2.0.0-SNAPSHOT.jar -processor
> org.apache.openjpa.persistence.meta.AnnotationProcessor6 *.java
> to
> javac -processorpath openjpa-all-2.0.0-SNAPSHOT.jar *.java
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