Cayenne agent misses JPA entity classes that were loaded before their
PersistenceUnits
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Key: CAY-859
URL: https://issues.apache.org/cayenne/browse/CAY-859
Project: Cayenne
Issue Type: Improvement
Components: Cayenne JPA
Affects Versions: 3.0
Reporter: Andrus Adamchik
Assignee: Andrus Adamchik
Fix For: 3.0
In a command line application running with Cayenne agent , the following code
would result in exceptions about Artist not being persistent:
Class.forName("test.Artist");
EntityManagerFactory emf = Persistence
.createEntityManagerFactory("cayenne-tutorial");
EntityManager em = emf.createEntityManager();
tx = em.getTransaction();
tx.begin();
em.createQuery("delete from Artist").executeUpdate();
Since redefining already loaded classes is not possible (instrumentation spec
prohibits adding fields to such classes for instance), the only solution I see
is to trigger PersistentUnit loading from within the agent. I am going to make
it optional as it slows down app startup. This will be an agent parameter
"jpa-eager-load"
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