How to handle memory leakage

My application need to process data from different table in MS Access database. I would store the data in the arraylist of the object class which is of the type that my application define.
It would then process to create a pdf file using iText API.
I have an batch file that call the Main program three time to create three different pdf, depending on input parameter, just as follow:
java PrintMergeReportStarter 1
java PrintMergeReportStarter 2
java PrintMergeReportStarter 3
each of PrintMerge would cause so much memory usage, but after first calling PrintMergeReportStarter, I assume that the memory would be all be free as Object life cycle would terminate. However the result not true
I have monitor the memory using the task manager in window 2000
after first time calling PrintMergeReportStart, the memory available has only increase so little. It may die at second or third java job due to "Out of Memory"
I would like to know the way to free memory. Also, would adding delay thread in java PrintMergeReportStarter help in improving this situation?
Thanks a lot for your help
Joe Wong

Instead of create 3 JVM's why don't you allow your program to handle multiple arguments on the command line, thus you only need to start the JVM once (e.g. java PrintMergeReportStarter 1 2 3)
Thomas

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best regards,
Message was edited by:
happy_life

Comments inlined:
does making objects equal null help the gc handle
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Reference {thread:id=2486655}
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