[Opensource] get java.util.ConcurrentModificationException

[Philipp Reber]

Hi there,

At the moment I'm working with expresso 4.02 and I'm having some problems:

I have a TimestampDBObj which contains the workingtime of users. To output 
this values in a table, I
request the database with retrieving multiple records by each day and 
project. All received users in the List
I put out in the tabe, each one in a new row.

The problem is: Retrieving multiple records from the DB (for loop) I get 
sometimes a an
Exception 2  java.util.ConcurrentModificationException. I did several tests 
but the Exeptions
occueres not regular. It just happens by coincidence. I checked the 
setFields(), they are always correct.
The mistake must be somewhere in the response of the DB. Unfortunately I 
have now idea any more at
the moment.

Does anybody have or had similar Exceptions problems or is it just me how 
is doing some garbage??

I would be very happy to get some response.
Thanks in advanced!

Greetings, Philipp


Some of my code:

         /********************************************************************************
         * Create blocks
         ********************************************************************************/
         // create a list block

         Block blockList = new Block("ProjecttimeList");
         myResponse.add( blockList );
         blockList.setAttribute("table", "Y");

         String head = " Day | Date | User | Activity | Time ";
         blockList.setAttribute("header-row",head);

         try{
             // create a block for each row
             Block blockRow = new Block("row");
             blockRow.setAttribute("row", "Y");

             // select each day of month
             for (int p = 1; p <= 31; p++){
               if (p < 10){
                 selecteddate = selectedYear + selectedMonth + "0" + p;
                 }
               else{
                 selecteddate = selectedYear + selectedMonth + p;
                 }

                 try{
                   TimestampDBObj timestampsList = new TimestampDBObj();
                   TimestampDBObj oneTimestamp = null;
                   timestampsList.setField("ts_project", selectedProject);
                   timestampsList.setField("ts_date", selecteddate);

                   // retrieve records of specific date
                   for (Iterator e = 
timestampsList.searchAndRetrieveList("ts_date").iterator(); e.hasNext();){

                     oneTimestamp = (TimestampDBObj) e.next();
                     out2.println("p in for loop : " + p);

                      // get day from date
                      Weekday  myweekday = new Weekday();
                      String weekday = 
myweekday.getWeekday(Integer.parseInt(selectedYear), 
Integer.parseInt(selectedMonth)-1, p);

                      blockRow.add(new Output(weekday));
                      blockRow.add(new 
Output(oneTimestamp.getField("ts_date")));
                      blockRow.add(new 
Output(oneTimestamp.getField("ts_user")));
                      blockRow.add(new 
Output(oneTimestamp.getField("ts_activity")));

                      oneSpanTime = 
round(Double.parseDouble(oneTimestamp.getField("ts_span")), 2, 0);
                      blockRow.add(new Output(Double.toString(oneSpanTime)));

                      blockList.add(blockRow);

                 }//end of for (row)

                 }
                 catch (Exception e){
                   System.out.println("Exception 2 ;  " + e.toString());
                 }

              }//end of for from select each day


         }//end of try (create each block for row)
         catch (Exception de){
         System.out.println("Exception 1 ;  " + de.toString());
         }
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