[castor-dev] concurrent transaction exception

[Jean-Noel WALLEZ]

I used Castor+Tomcat 4.0 and Struts. I can udpate a record once, when I try to update it another time, I get the following exception.   org.exolab.castor.jdo.ObjectModifiedException: Transaction aborted: Object of type be.wavenet.db.Signa with identity 5 has been modified by a concurrent transaction   What is wrong?   Can I use Castor inside tomcat without JNDI (like I do I my servlet) ???     thanks jean-noel   here is the code from my servlet       JDO      _jdo;   _jdo = new JDO();     FileOutputStream fosCastorLog = new FileOutputStream("castor.log");   PrintWriter pwCastorLog = new PrintWriter(fosCastorLog);   _jdo.setLogWriter( pwCastorLog );     _jdo.setConfiguration("database.xml");   _jdo.setDatabaseName( "wavenet" );   try{    Database      db;    db = _jdo.getDatabase();    db.begin();    Signa signa = (Signa) db.load(Class.forName("be.wavenet.db.Signa"),new Integer(signaForm.getSigna_id()),Database.Exclusive);       signa.setEmail([EMAIL PROTECTED]); ...      db.commit();    db.close();   }   catch (Exception e){             errors.add(ActionErrors.GLOBAL_ERROR,                        new ActionError("errors.castor",e));   }     String l_result = "success";   if (!errors.empty()){    System.out.println ("!errors.empty()");       saveErrors(request, errors);      }     return mapping.findForward(l_result);