Thread: java.lang.OutOfMemoryError: Java heap space

That is pretty expected, if you're doing things like storing millions of Objects based on each pixel of a large image. I'd look at modifying your algorithm to be as efficient as possible (this is one of the few cases I actually recommend bothering with optimization). Alternatively, you could also try saving stuff out to a file- but I'd try the optimization route first.

Without knowing your algorithm, I can't really tell you how to optimize it.

The thing is, even with optimization, if you're storing all of the pixels (why a 3D array?), you're going to run out of memory with sufficiently large images. Perhaps you could work with the pixels one row at a time, or even one at a time, instead of storing them all at once?

To add to Kevin's post, a single pixel for an 8 bit image can be stored in a single int primitive, (rgba - one byte for each value - access the values using bit operations), and all pixels for an image in a single 1D or 2D array. When one starts creating different ways to store these values that require larger data types/structures, you will more easily run into memory problems with larger image.

No problem. Did you get it figured out?