Agent enhancer doesn't work with Tomcat
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Key: OPENJPA-1590
URL: https://issues.apache.org/jira/browse/OPENJPA-1590
Project: OpenJPA
Issue Type: Bug
Components: integration, UnenhancedClasses
Affects Versions: 2.0.0-M3
Reporter: Jeremy Bauer
Originally reported as OPENJPA-1410 - Class linkage exception when creating an
EMF with OpenJPA M3
Experimentation and a quick search for similar issues is showing that use of
the OpenJPA's agent enhancer with Tomcat never worked?!? The agent gets tied to
the base class loader and enhances classes available to that loader at startup.
Each app has their own lazily instantiated class loader. Enhancement has
already taken place by the time those loaders get instantiated. This looked
like a regression, but it it is actually a separate and much larger issue than
the one raised in this JIRA. I will not pursue that issue at this time.
Please verify that you no longer see the original problem/exception with latest
2.0 build. If you were relying on runtime enhancement you will need to
re-enable it by specifying:
<property name="openjpa.RuntimeUnenhancedClasses" value="supported"/>
A more recommended solution is to enhance your entities at build time and set -
<property name="openjpa.DynamicEnhancementAgent" value="false"/>
<property name="openjpa.RuntimeUnenhancedClasses" value="unsupported"/>
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