rmannibucau edited a comment on pull request #64:
URL: https://github.com/apache/openjpa/pull/64#issuecomment-658034247
@struberg point is that the classloader does it and the transformer is
called under that lock already
@jgrassel will test your sample but today I'm off but I will come back to
you likely tomorrow, thanks a lot for setting up a project!
edit: tested on tomee adding:
<plugin>
<groupId>org.apache.tomee.maven</groupId>
<artifactId>tomee-maven-plugin</artifactId>
<version>8.0.3</version>
</plugin>
It works as expected:
Starting Worker thread 1...
Starting Worker thread 2...
Worker thread Thread-63 started.
Worker Threads Complete.
Now to verify enhancement. Look at the interfaces associated with
EntityA and EntityC:
Worker thread Thread-64 started.
Worker thread Thread-63 finished.
Worker thread Thread-64 finished.
Class: model.EntityA
Interfaces:
org.apache.openjpa.enhance.PersistenceCapable
Class: model.EntityC
Interfaces:
org.apache.openjpa.enhance.PersistenceCapable
he.openjpa.enhance.PersistenceCapable
Worker Threads Complete.
Now to verify enhancement. Look at the interfaces associated with
EntityA and EntityC:
Worker thread Thread-66 finished.
Class: model.EntityA
Interfaces:
org.apache.openjpa.enhance.PersistenceCapable
Class: model.EntityC
Interfaces:
org.apache.openjpa.enhance.PersistenceCapable
In particular with the proposed patch ^^. Any way to patch liberty locally
to run openjpa (creating my liberty.openjpa.jar with blueprint registration
maybe?).
edit 2: just checked openliberty sources
(https://github.com/OpenLiberty/open-liberty/ right?), seems all classloaders
are marked as concurrent but wrongly get the lock, in particular when there is
a transformer so this is not an openjpa issue but an openliberty issue, no?
Look
https://github.com/OpenLiberty/open-liberty/blob/integration/dev/com.ibm.ws.classloading/src/com/ibm/ws/classloading/internal/AppClassLoader.java#L272
for ex, if no transformer is it correctly impl, if there is a transfomer it
bypasses the lock :s.
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