Re: Problem on Project: GWT + JPA(eclipselink 2.4) + DB(postgresql 9)

@Warning: 

Do you use that mentioned class? If not check your web.xml if its registered as listener.

@Exception:

Do you have javax.persistence-1.0 and javax.persistence-2.0 on classpath / in WEB-INF/lib ?

Looks like your RpcUtilizadoresImpl uses a method of javax.persistence.Persistence that exists in your IDE but not when you have deployed the app to your app server. This could be a hint that your classpath is different (or just have a different order).

-- J.

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