Effectuer du JDBC via l'Entity Manager

C'est bon j'ai fini par trouver :D
Code:
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@PersistenceContext(unitName="test")
   EntityManager mgr;
 
.....
EntityManagerImpl object = (EntityManagerImpl)mgr.getDelegate();
       SessionImpl session = (SessionImpl)object.getSession();
             try {
                     DatabaseMetaData meta = session.connection().getMetaData();
                     String names [] = {"TABLE"};
           ResultSet tables = meta.getTables(null,"%","%",names);
           while(tables.next()){
                             String nameTable = tables.getString("TABLE_NAME");
                             System.out.println(nameTable);
           }
                 } catch (Exception e) {
           e.printStackTrace();
       }