Free Java Compilers, Assemblers, Native Code Compilers

Java compilers and development kits to build applications, applets, Java Beans

Free Java Compilers, Assemblers & Java Development Kits (JDK)

This page lists free Java compilers, Java assemblers, Java builders, Java Development Kits (JDK), and Java to native code compilers, that you can use to create Java applications, Java Beans, Java Applets and the like. Some of these are complete Java development environments while others only include the compiler and debugger. Other Java pages on this site that you may be interested in include:

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Free Java Compilers, Java to Native Code Compilers, Java Development Kits (JDK)

Microsoft's Build of OpenJDK New

Microsoft's build of OpenJDK comes with an installer, which does not require you to sign up for an account, as the Oracle's version does. It is available for Windows, macOS and Linux.

OpenJDK (Oracle)

You can get the open source JDK for Windows, Mac OS X, and Linux from the OpenJDK project. OpenJDK is currently the official reference implementation of Java SE (ie, the standard edition of Java).

Jikes Java Compiler

Jikes is a Java compiler that is supposedly faster than most other compilers. It is also able to compute the dependency requirements in programs and so generate makefiles. If you want faster development cycles, you might also fancy its ability to perform incremental compilations. Platforms supported: Windows 95/NT, AIX, OS/2, Linux, Solaris Sparc. The compiler handles constructs exactly according to the Java specifications. Source code is available under an open source licence (IBM Public License).

Toba (Java to C Compiler)

[Update: this compiler is no longer maintained, and it uses only the old JDK 1.1.] Toba translates Java applications to C source files, from which you can compile into native executables (binaries). The program is distributed in source code form, and has been tested on Linux, Irix 6.2 and Solaris 2.5.

GNU Compiler for the Java Programming Language (GCJ)

[Update: the Java front-end is no longer maintained or available.] This Java compiler is developed independently of the one by Sun. It is able to generate both Java bytecode and native machine code, as well as convert Java bytecode into native machine code (so theoretically you can even use this compiler to convert a Java program compiled by another compiler into a native binary/executable). Your compiled applications can also be a mixture of compiled native code and Java bytecode. It comes with its own class libraries and garbage collector. The advantage of this compiler over Sun's is its ability to generate native machine code and its wide cross-platform availability. Supported platforms include Windows, Linux, AIX, DOS, Renesas, HP-UX, SCO OpenServer/Unixware, Solaris, SGI, IRIX, Digital Unix, OS/2, and so on (too many to list).

Free Java Assemblers

Java Bytecode Assembler

This is an assembler that converts Java "assembly language" into valid Java class files. The input language is similar to that generated by Sun's javap utility.


According to the website, Jasmin "takes ASCII descriptions for Java classes, written in a simple assembler-like syntax using Java Virtual Machine instruction set" and generates a Java class file.

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