Tool

Krakatau

Krakatau assembles and disassembles Java bytecode, including obfuscated class files, and can reassemble the text back into a class file. krak2 dis writes assembly, and --roundtrip keeps a bit-for-bit reassembly. krak2 asm assembles .j files. The assembler syntax covers the Java 27 bytecode specification. The v2 decompiler is unfinished, so decompilation still uses Krakatau v1 on the master branch. cargo build --release produces target/release/krak2.

Targets: Binary
Category: JVM bytecode tools
Relationship: Foundation tool
Sources reviewed: 2026-11-07

Stars: 2.3k
Last commit: 2026-10-29
Language: Rust
License (GitHub): Apache-2.0

GitHub data as of 2026-11-09

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Requirements & limits

Rust and Cargo. cargo build --release.
License: MIT or Apache 2, at the user's choice. Krakatau v1, and v2 through commit baa5534ab29dbfb7b62018bed897f52073974f2f, were GPL-3.0-or-later.

Cite

BibTeX

@misc{krakatau,
  title = {{Krakatau}},
  howpublished = {\url{https://github.com/Storyyeller/Krakatau}},
  url = {https://github.com/Storyyeller/Krakatau},
  urldate = {2026-11-07},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/krakatau/}}
}

Plain text

Krakatau. https://github.com/Storyyeller/Krakatau (accessed 2026-11-07). Awesome REA entry: https://awesomerea.org/resources/krakatau/

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Primary sources

README.md GitHub · Storyyeller/Krakatau · Revision 6929fd6