Don't use openGL for your first 2D platformer.

Use any 2D framework instead.

Try Slick2D...it's actually based on LWJGL which uses OpenGL. It is very similar to java's already existing graphics tools so it's no sweat for a first project.

Hi,

It is always great to see programmers using various languages and liking them, such as the Java that you enjoy. So many beginners with dreams of BIGTIME try to jump right into C++ cross-platform MMO and stuff - LOL Java is a powerful language and you will eventually find advantages long term for crossplatform through OpenGL and other implementations. Have you looked at jMonkey? It really rocks the Java game dev!

I am not sure by your post how far you have progressed in game making, but I would say save OpenGL until you have at least 3 to 5 games made in 2D.

So if i go with Slick2D everything will be fine?

Yep.

Make sure to read all the documentation and the wiki before you get started.

There are a lot of features that I wish I had known about before I started my project, and I'm sure you will find lots of tools you will want to use as well.

Of corse i did but i never figure out how to use it ).
I think you guys misunderstand me I am not really a begginer i have 1 year + a couple of months experience.

Yes, we understand but you were not specific about how many games that you have made, for all we knew only two. Number of games made can give somebody a better idea if you are ready to advance to a certain new feature of game development, other things considered, too.

You wrote that you never figured out how to use jMonkey, but have you asked for help from the jMonkey community or used a demo game or open source jMonkey game to help you?

I say this only to help, but you really need to pay attention to specifics and alternatives. Details are something to embrace in game development.

Clinton