I'd like to validate that a particular field on my domain object is unique. For example, I don't want usernames to be used more than once. I can annotate the domain object for persistence and enforce uniqueness but how do I get the validator framework to determine this before the INSERT takes place. I have some code that automatically sends errors back in the right way to the application tier and would rather continue to use it for all errors. I created a validator that should do this, but I can't use @PersistenceContext on the EntityManager. And If I use the EntityManagerFactory I get
java.lang.NoClassDefFoundError: net/sf/ehcache/CacheException

-jeff

there is not reasong why ehcache would be missing. Double check your classpath

I'm using the ejb3 profile from the jboss 4.0.3 installer. I'll try sp1 and see if it fixes the problem. Is there a known issue with this version of jboss?

-j

Same problem with the ejb3 profile using the jboss installer for 4.0.3sp1. The code I'm using is pretty simple:

EntityManagerFactory emf = Persistence.createEntityManagerFactory("em1");
entityManager = emf.createEntityManager();

Its the first line of code there that barfs.

I added ehcache to my server lib and all was fine. Sorry for wasting everyone's time.

-j