Mp3 plugin not letting me play midis?

I am working on a project for a computer science class that involves playing Mp3s and midis. The thing is, after i put in a class that can play Mp3s, the program no longer plays Midis. Even if i comment out any code involving Mp3s, when i run the program, the Midi doesn't play, does anyone know anything about this?

[324 byte] By [Zero1234567a] at [2007-10-2 21:38:15]
# 1
oh yeah, that first comment is kind of misleading, What actually happens is, i used JMF to write the code to play mp3s, so after i installed JMF, it seems that the midis stopped working for that particular game.
Zero1234567a at 2007-7-14 0:52:41 > top of Java-index,Security,Cryptography...