Too many open files and Memory leak

I deseenvolvendo an application with javafx and RFID ...

The project consists of a video loop and that is when a player approaches the tag it shows another video related to the identifier of the tag ...

Making the performace test found that for some reason ...

He opens the media files on it and does not close, because after some time he's two possible errors.

- He hangs and when I check and see that the memory is full and hence the second error occurs in which he says many open files.

Already checked my a Code and do not know because the medias are not being closed and the exact reason for the cause of the error ..

Please help me have already tried the solution here and not found