I have solved.
The problem is in frist line near the class:

public class IsoServlet extends HttpServlet {
        final Logger log =
Logger.getLogger(IsoServlet.class.getName());
        public PersistenceManager pm =
PMF.get().getPersistenceManager();
....
....
  String test() {
....
....
  }

  String test2() {
....
....
  }


}

I have moved the line:
        public PersistenceManager pm =
PMF.get().getPersistenceManager();
in every functions

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