Does ProGuard support Java 11?

Question

I was trying to use Proguard (6.1.0beta1) but got

(Unsupported version number [55.0] (maximum 54.0, Java 10)))

Are there alternatives to ProGuard which can manage with Java 11?

Answer 1

Java 11 have introduced changes to the bytecode and class file format:

• JEP 181: Nest-Based Access Control
• JEP 309: Dynamic Class-File Constants

Because of above it's unlikely that you will find a working code obfuscator at the moment. Hopefully ProGuard will be updated soon (see #188 Support Java 11 planned for ProGuard 6.1).