Procyon

Spec sheet

Purpose

Procyon is a suite of Java metaprogramming tools for code generation and analysis, including reflection, expression trees, and a Java decompiler.Read 9 Oct 2026 · github.com

License

The repository displays an Apache-2.0 license.Read 9 Oct 2026 · github.com

Decompiler limitation

Classes compiled with Eclipse or compilers other than javac may produce less optimal results, especially for String-based switch statements.Read 9 Oct 2026 · github.com

Decompiler support

The decompiler handles Java 5 and later features including enums, switch statements, local classes, annotations, lambdas, and method references.Read 9 Oct 2026 · github.com

Distribution

Procyon libraries are available from Maven Central under group ID org.bitbucket.mstrobel.Read 9 Oct 2026 · github.com

Experimental components

The compiler toolset and Java decompiler are identified as experimental in the repository README.Read 9 Oct 2026 · github.com

Expression trees

The expressions framework supports declarative expression trees that can be compiled into callbacks or coupled with a MethodBuilder.Read 9 Oct 2026 · github.com

Interfaces

The decompiler framework can be integrated into other applications and called programmatically through its public API.Read 9 Oct 2026 · github.com

Reflection

The reflection framework supports generics, wildcards, and other high-level Java type concepts.Read 9 Oct 2026 · github.com

Related tools

The repository lists SecureTeam Java Decompiler and Bytecode Viewer as third-party products based on or using Procyon.Read 9 Oct 2026 · github.com

Runtime code generation

The reflection framework includes TypeBuilder, MethodBuilder, and a bytecode emitter.Read 9 Oct 2026 · github.com

Runtime requirement

The Java decompiler wiki says Java 7 is required to run it.Read 9 Oct 2026 · github.com

Standalone use

The decompiler front-end embeds its dependencies in the JAR for easy redistribution.Read 9 Oct 2026 · github.com

Plans and prices

Every Procyon plan and price →

Where Specifiction places it

• Reverse Engineering Tools#41 of 737.2
• Decompiler Software#19 of 247.3