From: <glassfish_at_javadesktop.org>
Date: Tue, 25 Sep 2007 11:26:06 PDT

Hello Fernando,
   You may have run into this issue : https://glassfish.dev.java.net/issues/show_bug.cgi?id=2625
There is a simple workaround, just add the interface(in your case:
IFornecedor) into the classes list in the persistence.xml file.

--Gordon
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