rej

An API and a graphical tool for inspection and manipulation of classfiles for the Java platform.

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Platforms: Linux · Last verified September 6, 2026

An API and a graphical tool for inspection and manipulation of classfiles for the Java platform.

Only use this tool against systems you own or are explicitly authorized to test — see the disclaimer.

Getting started

Install on BlackArch with `pacman -S rej` (or add the BlackArch repository to an existing Arch Linux install). See the official BlackArch tool listing and upstream homepage linked above for details.

Commonly preinstalled on

BlackArch

Arch Linux-based distribution with one of the largest pentest tool repositories