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https://issues.apache.org/jira/browse/OPENJPA-1860?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12929412#action_12929412
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Hugh commented on OPENJPA-1860:
-------------------------------
After a lot of permutations I've concluded that this works, but only in limited
conditions:
1. Compiling with the PCEnhancerTask requires loading the openjpa.ClassResolver
which requires access to any configuration resources needed to modify orm.xml.
To work around this I put a dummy persistence-unit as the first
persistence-unit in persistence.xml because it only attempts to do this for the
first PU. This seems to be rather arbitrary but I suppose it help when you want
to modify the classes at compile time.
2. The only ClassLoader method called which can be overridden to modify
META-INF/orm.xml is public Enumeration<URL> getResources(String name) throws
IOException;
None of the others are called when accessing orm.xml. This means that I need to
write an actual file with the modifications I require at runtime and return the
URL for that file from that method.
3. NamedQueries can't be used because for some reason they use the jar's
META-INF/orm.xml without the openjpa.ClassResolver and the class annotations
with openjpa.ClassResolver.
This works, but it's clumsy and awkward.
My question is, why isn't getResource and getResourceAsStream called by OpenJPA
on the openjpa.ClassResolver to retrieve META-INF/orm.xml?
> How do I get OpenJPA to use my custom classloader to load Entity classes?
> -------------------------------------------------------------------------
>
> Key: OPENJPA-1860
> URL: https://issues.apache.org/jira/browse/OPENJPA-1860
> Project: OpenJPA
> Issue Type: Question
> Components: jpa
> Affects Versions: 2.0.1
> Environment: OpenJPA 2.0.1 Java 1.6-22
> Reporter: Hugh
> Attachments: ORM.xml, persistence.xml, QueueData.java
>
>
> I have written a custom classloader and I can't work out how to get OpenJPA
> to use it to load my entity classes.
> I've followed instructions I found to set
> Thread.currentThread().setContextClassLoader() at startup before loading any
> EntityManager and it seems to load the OpenJPA classes and a lot of others,
> but not the class I'm interested in.
> Is this the right approach?
> If so, where have I gone wrong?
> (http://openjpa.208410.n2.nabble.com/Dynamic-Table-value-td5645906.html)
> If not, how should this be done?
> Is there some sort of guide to accomplishing this that someone could point me
> to?
> Thanks.
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