[jboss-user] [Beginners Corner] - Re: EJB 3 merge vs persist

vashistvishal do-not-reply at jboss.com
Thu Sep 28 01:37:10 EDT 2006

What merge () does is - is to put back the detached entity back into persistence storage.
So if in yr case- if yr entity was detached it will put it back to persistence which means you don't have to call persist again.

For answer to part 2. - merge() method with throw an illegal Arguement Exception if its paramter is not an entity type. 

I hope this helps....

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