Unsupported class file major version 61

Question

Unsupported class file major version 61

jeancc opened this issue 3 years ago · comments

Jero commented 3 years ago

I'm trying to obfuscate code compiled with openjdk 17, using yguard 3.0.0. It seems that openjdk 17 is not suported:

Ant output:

[shrink] ERROR: Unsupported class file major version 61
[shrink] Unsupported class file major version 61

Thomas Behr · Answer 1 · Tue Sep 28 2021 20:41:18 GMT+0800 (China Standard Time)

Correct, yGuard does not support Java 17 byte code. See Compatibility in the yGuard documentation.

Jero · Answer 2 · Tue Sep 28 2021 20:48:36 GMT+0800 (China Standard Time)

I've tried to change 'Compiler compliance level' on eclipse IDE to 11, with no luck...

Thomas Behr · Answer 3 · Tue Sep 28 2021 21:08:50 GMT+0800 (China Standard Time)

Actually use a Java 11 compiler to compile your source code to Java 11 byte code instead of asking a higher version compiler to produce lower version byte code.