Exception in thread "AWT-Event Queue 0" Mem Out of Bounds. Java Heap Space

Question

Hello,
I'm not sure how to resolve this Java Heap Space Memory Out of Bounds error. Could someone please assist me with this error?
A SCENARIO:
I am reading in tons of data from 5 separate text files. The files have tons of rows (up to 64,220 in one). The data must be read into the program and assembled. When I have all of the files populated, I receive the OOM Error. If I remove the data from one of the 5 files the program runs successfully. If I add the data back into the file and then remove the data from some other file, the program runs successfully.
Thanks
RodneyM

Answer 1

ff.skip(18);
i = ff.read();
i = ((ff.read() << 8) | i);
i = ((ff.read() << 16) | i);
i = ((ff.read() << 24) | i);
xsize = i;
System.out.println("width=" + xsize);
i = 0;
i = ff.read();
i = ((ff.read() << 8) | i);
i = ((ff.read() << 16) | i);
i = ((ff.read() << 24) | i);
ysize = i;
System.out.println("Height=" + ysize);
ff.skip(38);//62-(2+16+4+4=26)=36, actually total=62 Bytes header This is completely wrong. First an foremost you should not have this code in the paint(Graphics g) method. This is a GUI thing. The paint method may be called for any reason and you do not+ want to open a file stream, read it, and do the distance transformation every single time the method is called. There's also the issue that you have overridden the paint method as opposed to subclassing a component, overriding the paintComponent method, and adding it to the frame. But that can be ignored for right now (it will come back later and cause complications).
Next, you've said that the header is 62 bytes. This is incorrect for a png file. The code you have posted assumes (very specifically) that you have inputted a BMP version 3 with 2-color entry palette. In other words you can only open a very specific type of image with that code. Definitely not a png. This is what was causing the out of memory error since it interprets the width and height wrong when reading the bytes and you end up trying to create a 2-D int array that will take up several hundred megabytes in size
//xsize and ysize are interpreted wrongly
pix=new int[xsize][ysize];
mat1=new int[xsize][ysize]; Now granted, BMP v3 is the most common type you will encounter but you must admit that the code is not very robust at all (since it requires a very specific input).