** Uncaught Exception! **

[shaga-sakurai]

Version: 0.16.1
Build date: 2018-06-13 01:54
OS: Linux (amd64)
JRE: 1.8.0_202
OpenGL version: 3.0 Mesa 18.3.4 (Intel Open Source Technology Center)
Error: ** Uncaught Exception! **
Stack trace:

java.lang.NoSuchMethodError: java.nio.FloatBuffer.flip()Ljava/nio/FloatBuffer;
	at org.newdawn.slick.openal.SoundStore.init(SoundStore.java:376)
	at org.newdawn.slick.Music.<init>(Music.java:204)
	at itdelatrisu.opsu.audio.MusicController.loadTrack(MusicController.java:144)
	at itdelatrisu.opsu.audio.MusicController.access$000(MusicController.java:54)
	at itdelatrisu.opsu.audio.MusicController$1.run(MusicController.java:116)

[itdelatrisu]

Are you using a build from here? This looks like plasma-umass/doppio#497 (building with Java 9 -> targeting Java 8).

Edit: See #421.