SDL in Java

I dont think so.
I'm pretty sure that SDL is native to C++

Yes it is possible. Since SDL was writen in C you could use JNI to access SDL functions. The question is why would you want to? All of SDL's functionality is already in Java API.

here

Thank you HappyBara thats what I was looking for.

Its very superfluous to use SDL and Java on windows; SDL uses Directx for 2d gfx on Windows and so does Java ie you will get the same performance.