Tag Archive for 'hibernate'

Problem with Hibernate many-to-many association

09Nov06

This post is really a record for both myself and anyone else who ever comes across the same problem.
The Problem: Given two entities with a many-to-many association between them, the join table isn’t being populated when an association is made.
The Problem Set: Two persistent entities, “Group” and “ActivityType” with a many-to-many association between them. A [...]

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Using Managed Sessions in Hibernate to Ease Unit Testing

06Nov06

If you’ve ever tried to reuse a session in Hibernate you may have come across this exception…

org.hibernate.SessionException: Session is closed!
at org.hibernate.impl.AbstractSessionImpl.errorIfClosed(AbstractSessionImpl.java:49)
at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1319)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:301)
at [...]

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