where can i find a a java program for 2D bin packing problem where i
can give set of rectangles of size of both width and height  that
needs to be fitted in a recthaguar bin of specified size with already
filled in by some rectangles of specified position and size or if some
one can write java utiity class that i can use it in my program also
helps.

You do realize that this problem is provably NP-?  There is extensive
literature on this; while the results can be computed, all known
techniques for determining the time taken to calculate the results
increases exponentially with the number of rectangles specified...

i just need some simple program which contains about 5-8 rectangle ,
the rectangles are alreay prefilled, there is only one rectangle
outside the bin that i need to fill in .