2 4 things:
Think before you post.
Think harder before you post.
Think 10x harder than before you thought harder before you posted
Sometimes when you post, and you come to explain your problem, you start to see what you have done wrong.
No-one's time was wasted here, through posting he came up with his own answer. I don't see why he shouldn't have posted this. It didn't harm anyone.
Slick is a little outdated, and I see that you are just using lwjgl at this point. Here is some advice: If you know how to use those commands, slick2d is not for you. Go to libgdx. You will not regret it.
Considering he is working with Alpha maps, I think he is a considerable way through his project. By switching to libgdx, he would not only have to go through the process of learning it, but also going through all his code and re-doing everything. When you add all that time together, it would probably not justify switching to libgdx.