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EJB - Everything works except persist()

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Hello, this is my first application using openEJB and I'm trying to develop a simple Blog.
I have four entities : User, Comment, Post and Categories (a post can have multiple categories)
Here is the code of my Category Entity :

And in my JpaCategoryDao (where I have the @stateless), I have :

When I try to call the JpaCategoryDao.addCategory(), I have an exception :


javax.ejb.EJBTransactionRolledbackException: Transaction was rolled back, presumably because setRollbackOnly was called during a synchronization
$Proxy72.addCategory(Unknown Source)

I've been searching about this exception, but I can't find a solution, I don't even understand what I do wrong. Especially because in my Dao where I have em.merge(), it works, I didin't tried the em.delete() but all other functions works (em.find, queries, etc)
So I've been thinking that I probably did something wrong when i declared my entities, or when I create my tables and fields in my database... But I've been searching for hours now, and I can't find what is wrong...

My Entities : (I don't write all my setters and getters)

And Finally, this is the structure of my Mysql Database :

If someone can help me, it would be great... Because I don't see what's wrong...

(And also, I'm sorry for my expression, but I'm french, so...)

Thank You very much !!
Ranch Hand
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check the exception log before "Transaction was rolled back" log, the rollback will happen only after there is any database exception, can you post your client code that is invoking addCategory ? are you passing unique value for Id? this is general error during trial and error for first time...
Julie Lo
Posts: 2
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It's okay, I solved my problem.
I've been looking into Mysql Queries log, and my problem was that the table OPENJPA_SEQUENCE_TABLE didn't exist, so I had to create it manually and now it works perfectly
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