Java.lang.OutOfMemoryError

"Exception in thread "AWT-EventQueue-0" java.lang.OutOfMemoryError: Java heap space"

Ok, so I have a problem that is giving me this error and I am hoping that there might be someone who could help me out.

Code:

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    private String CalcFileSize(){
            System.out.println("Calculating Size of File");
            File _tempFile = new File (fileName.getText());
            System.out.print(_tempFile.length());
            byte [] _fileSizeGetter = new byte [(int)_tempFile.length()];
            _fileSizeToSend = _fileSizeGetter.length;
            String _sendFileSize = Integer.toString(_fileSizeToSend);
            System.out.println("File Size Calculated");
            return _sendFileSize;

    }

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Ok, this function basically creates a File called _tempFile and loads something into it (for example, if fileName.getText() == "source.pdf" then it will grab that file and throw it into _tempFile). The problem occurs when I use a large file. Particularly something like a 200meg file. Anyone have a suggestion on a possible way around this?

Seems that it can handle up to about 50 megs and then that is that.

you need to specify larger heap

Quote:

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-Xms<size> set initial Java heap size
-Xmx<size> set maximum Java heap size

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http://blogs.sun.com/watt/resource/j...ions-list.html

Much better idea is not to read the whole file at once, read a bit and increment a counter, keep on going untill end of stream. If you simply keep maxing your heap size, that is a row never ending. There are always larger files.

I do not see anything in your code that indicates what kind of input/output stream you are using. I routinely read and write files over 500MB here without having any OutOfMemory errors. Are you using BufferedInputStream?