Merging 1000 PDF thru iText throws java.lang.OutOfMemoryError: Java heap space

I am trying to merge 1000 PDF Files thru iText. I am not sure where the memory leakage is happening. Below is the sample code. Note that i am removing the child-pdf file as soon as i merge to the parent file. Please pointout bug in below code or is there any better way to do this with out memory conception. This process is done thru servlet (not standalone program) FileInputStream local_fis = null; BufferedInputStream local_bis = null; File localFileObj = null; for(int taIdx=0;taIdx

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