Mplayer + Mac OS

[Dimebag]

Hey, I need to open video files with my java application, I was looking for mplayer project for Mac OS.
I can easly use it on Windows with this code:

mplayerProcess = Runtime.getRuntime().exec("open \"mplayer/mplayer.exe -slave -quiet -idle " + mediaURL);

For leopard I need to run mplayer.app instead. So I use this code:

mplayerProcess = Runtime.getRuntime().exec("open \"mplayer/mplayer.app -slave -quiet -idle " + mediaURL);

But nothing happen. Actually my folder structure is
Root
-> Javaapp (where the jar is located)
-> mplayer
mplayer.app

I've tried also to just open the mplayer.app file with

mplayerProcess = Runtime.getRuntime().exec("open \"mplayer/mplayer.app");

But nothing happened aswell... the terminal didn't show any errors.
What I'm doing wrong? Any Clue?

Thanks,

[Webuser]

Do yo have JRE installed ?

[Dimebag]

Sure I have. My Java application is working just fine. In the ui there is a button to open the mplayer. Simple as that.
But is not working...