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FernFlower is a decompiler that was recently revived by being updated and open sourced by JetBrains.
Bytecode Viewer has this built in as one of the decompilers.
How to use
Install a Java runtime compatible with the downloaded build. Create an output directory, then pass the input followed by that directory:
mkdir output
java -jar fernflower-262.10968.63.jar application.jar outputThe input can be a class, JAR, ZIP or directory. For an archive input, inspect the generated archive in output for the reconstructed sources. An optional -e=dependency.jar supplies library classes for analysis without decompiling them.
Based on the official README.
Category: Tools Category: Java Category: Reverse Engineering
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