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