Thesis thesis3 = new Thesis(402, author3, 113, "Why mmdbms?", thesis2, uni3);
PersistenceManager pm = pmf.getPersistenceManager();
FetchPlan fp = pm.getFetchPlan();
fp.clearGroups();
fp.addGroup("detail").removeGroup("default");
pm.currentTransaction().begin();
logger.log(BasicLevel.DEBUG, "make persistent the thesis\n " + thesis1.toString() + "\n");
pm.makePersistent(thesis1);
logger.log(BasicLevel.DEBUG, "make persistent the thesis\n " + thesis2.toString() + "\n");