Seems they dont have a clue.

My log is the same as yours, ending with

  SEVERE [Main.logError]                             java.lang.ExceptionInInitializerError
    at com.turborilla.mule.view.MuleGameContainer.<init>(MuleGameContainer.java:75)
    at com.turborilla.mule.Main.main(Main.java:170)


Ive tried openjdk (which causes trouble with most stuff) jre/jdk 1.8 and jre 1.6. Same error always.
And, no. It is not drivers, permissions, sound, etc. All of that is checked out.

I have this issues on a fully updated Fedora workstation. It is working in an Archlinux system, installed from repos, so im going to check whats going on and reply here.