** Uncaught Exception! **

[Haringat]

Version: 0.16.1
Build date: 2018-08-08 00:33
OS: Linux (amd64)
JRE: 1.8.0_181
OpenGL version: 4.6.0 NVIDIA 396.45 (NVIDIA Corporation)
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)

This happens on Java SE 8 JDK as well as OpenJDK8 when trying to access the main menu. It does not happen on Java9+ though.

[tpenguinltg]

Duplicate of #418. I still don't understand how this is triggered because I'm on Java 8 and I don't get this error, both with sound effects on and off.

[itdelatrisu]

Linking #418.

[Lyonlancer5]

Java 9+?
May be related to plasma-umass/doppio#497, specifically this and this.

Noting that FloatBuffer and ByteBuffer both extend Buffer, the signature java.nio.FloatBuffer.flip()Ljava/nio/FloatBuffer; seems to expect a return type of a FloatBuffer instead of the superclass' Buffer (javadoc referenced).

Could it be that the JDK used to build the JARs are JDK 9+ targeting JDK 7 compatibility?

[tpenguinltg]

Could it be that the JDK used to build the JARs are JDK 9+ targeting JDK 7 compatibility?

No, not for the JARs, but based on the build date, it looks like @Haringat is building it himself.

@Haringat: I trust that running javac -version shows a Java 8 version?

I pushed up an issue/421 branch on my fork with the workaround described in the links above. Can you please try building from that branch (or apply the diff yourself) and see if that fixes anything?

[8ar10der]

I meet the same issue on my ArchLinux with openjdk8, I have to change to the openjdk10 to let opsu work.

[tpenguinltg]

@amaothree Are you building it yourself or using the JAR?