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 [...]
Tag Archive for 'hibernate'
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 $Proxy0.beginTransaction(Unknown Source) …. The reason for this is that Hibernate is using “thread” managed sessions. [...]
