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Forum locked This topic is locked, you cannot edit posts or make further replies.  [ 2 posts ] 
Author Message
 Post subject: ConcurrentModificationException and caching?
PostPosted: Sat Jan 05, 2008 6:25 am 
Newbie

Joined: Thu Dec 21, 2006 7:30 am
Posts: 11
Hi -

I having difficulties understanding the source of a ConcurrentModificationException I am observing.

The code region
Code:
try
            {
               logger.debug("Creating query");
               List<Object> list = session.createQuery(query).setCacheable(true).list();
               logger.debug("Query OK ");
               logger.debug("List null : "+ (list == null));
               logger.debug("List size : "+list.size());
               
               for (Object object : list)
               {
                  logger.debug("Adding from list to set");
                  set.add((T) object);
               }
               logger.debug("DONE, everything looks OK...");
            }
            catch (JDBCConnectionException e){
               logger.error("getAll() cought Exception");
               logger.error(e.getMessage());
               logger.error(e.getCause());
               logger.error(e);
               logger.error("JDBCConnectionException IS UNMANAGEBEL!!!");
               logger.error("--- Restarting server !!! ---");
               System.out.println("getAll() cought Exception");
               System.out.println(e.getMessage());
               System.out.println(e.getCause());
               System.out.println(e);
               System.out.println("JDBCConnectionException IS UNMANAGEBEL!!!");
               System.out.println("--- Restarting server !!! ---");
               System.exit(0);
            }
            catch (Exception e)
            {
               logger.error("getAll() cought Exception");
               logger.error(e.getMessage());
               logger.error(e.getCause());
               logger.error(e);
               logger.error("Session was null : "+(session == null));
               logger.error("Session is open : "+session.isOpen());
               logger.error("Query is: "+query);
               logger.error("Re-trying query : ");
               try{
                  List<Object> list = session.createQuery(query).setCacheable(true).list();
                  logger.error("Query OK ");
                  logger.error("List null : "+ (list == null));
                  logger.error("List size : "+list.size());
               
                  for (Object object : list)
                  {
                     logger.error("Adding from list to set");
                     set.add((T) object);
                  }
                  logger.error("DONE, everything looks OK...");
                  } catch (Exception innerEx){
                     logger.error("getAll() (retry) cought Exception");
                     logger.error(innerEx.getMessage());
                     logger.error(innerEx.getCause());
                     logger.error(innerEx);
                  }
               //Well, we failed...
               throw new InternalServerError(e);
            }


Error log from the first catch clause and forward:
Code:
2007-11-26 12:23:18,416 ERROR reflection.AEntity - getAll() cought Exception
2007-11-26 12:23:18,417 ERROR reflection.AEntity -
2007-11-26 12:23:18,417 ERROR reflection.AEntity -
2007-11-26 12:23:18,417 ERROR reflection.AEntity - java.util.ConcurrentModificationException
2007-11-26 12:23:18,417 ERROR reflection.AEntity - Session was null : false
2007-11-26 12:23:18,417 ERROR reflection.AEntity - Session is open : true
2007-11-26 12:23:18,417 ERROR reflection.AEntity - Query is: from integration.hibernate.IntegrationMapEntry where entityPattern='/SURGERYROOM/2029'
2007-11-26 12:23:18,417 ERROR reflection.AEntity - Re-trying query :
2007-11-26 12:23:18,444 ERROR reflection.AEntity - Query OK
2007-11-26 12:23:18,445 ERROR reflection.AEntity - List null : false
2007-11-26 12:23:18,445 ERROR reflection.AEntity - List size : 14
2007-11-26 12:23:18,445 ERROR reflection.AEntity - Adding from list to set
2007-11-26 12:23:18,445 ERROR reflection.AEntity - Adding from list to set
2007-11-26 12:23:18,445 ERROR reflection.AEntity - Adding from list to set
2007-11-26 12:23:18,445 ERROR reflection.AEntity - Adding from list to set
2007-11-26 12:23:18,445 ERROR reflection.AEntity - Adding from list to set
2007-11-26 12:23:18,445 ERROR reflection.AEntity - Adding from list to set
2007-11-26 12:23:18,445 ERROR reflection.AEntity - Adding from list to set
2007-11-26 12:23:18,445 ERROR reflection.AEntity - Adding from list to set
2007-11-26 12:23:18,445 ERROR reflection.AEntity - Adding from list to set
2007-11-26 12:23:18,445 ERROR reflection.AEntity - Adding from list to set
2007-11-26 12:23:18,445 ERROR reflection.AEntity - Adding from list to set
2007-11-26 12:23:18,445 ERROR reflection.AEntity - Adding from list to set
2007-11-26 12:23:18,445 ERROR reflection.AEntity - Adding from list to set
2007-11-26 12:23:18,445 ERROR reflection.AEntity - Adding from list to set
2007-11-26 12:23:18,445 ERROR reflection.AEntity - DONE, everything looks OK...
2007-11-26 12:23:19,012 ERROR reflection.AEntity - getAll() cought Exception
2007-11-26 12:23:19,012 ERROR reflection.AEntity -
2007-11-26 12:23:19,012 ERROR reflection.AEntity -
2007-11-26 12:23:19,012 ERROR reflection.AEntity - java.util.ConcurrentModificationException
2007-11-26 12:23:19,012 ERROR reflection.AEntity - Session was null : false
2007-11-26 12:23:19,012 ERROR reflection.AEntity - Session is open : true
2007-11-26 12:23:19,012 ERROR reflection.AEntity - Query is: from integration.hibernate.IntegrationMapEntry where entityPattern='/SURGERYROOM/2028'
2007-11-26 12:23:19,012 ERROR reflection.AEntity - Re-trying query :
2007-11-26 12:23:19,018 ERROR reflection.AEntity - getAll() (retry) cought Exception


Could it have something to do with the query.setCacheable?

Only one session is used.


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 Post subject:
PostPosted: Fri Jan 25, 2008 3:28 am 
Newbie

Joined: Thu Dec 21, 2006 7:30 am
Posts: 11
I found out what coursed the error. It was because the session flush mode was set to auto. Setting it to commit resolved the issue.


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