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This is the 1.3.4-SNAPSHOT "You'll Thank Me Later" release of the Ceylon command line tools. This is a production version of the platform.

Ceylon is a modern, modular, statically typed programming language for the Java and JavaScript virtual machines. The language features a flexible and very readable syntax, a unique and uncommonly elegant static type system, a powerful module architecture, and excellent tooling, including an awesome Eclipse-based IDE.

Ceylon enables the development of cross-platform modules which execute portably in both virtual machine environments. Alternatively, a Ceylon module may target one or the other platform, in which case it may interoperate with native code written for that platform.

Read more about Ceylon at

Distribution layout

  • cmr - Ceylon Module Resolver module
  • common - Common code module
  • compiler-java - JVM compiler module
  • compiler-js - JS compiler module
  • dist - Build files
  • language - Ceylon language module
  • model - Type model module
  • runtime - Runtime module
  • typechecker - Typechecker module
  • langtools-classfile - Java tools classfile module fork
  • tool-provider - Ceylon tool provider module
  • LICENSE-ASL - The Ceylon ASL license
  • LICENSE-GPL-CP - The Ceylon GPL/CP license
  • LICENSE-LGPL - The Ceylon LGPL license
  • - This file

Building the distribution

Go to the dist folder and follow the instructions in the file.

Source code

Source code is available from GitHub:


Bugs and suggestions may be reported in GitHub's issue tracker.

Systems where Ceylon is known to work

Since Ceylon is running on the JVM it should work on every platform that supports a Java 7 or 8 compatible JVM. However we have tested the following platforms to make sure it works:


  • Ubuntu "wily" 15.10 (64 bit) JDK 1.7.0_95 (IcedTea) Node 0.10.25
  • Fedora 23 (64 bit), JDK 1.8.0_77 (OpenJDK)
  • Fedora 22 (64 bit), JDK 1.8.0_72 (OpenJDK)
  • Fedora 22 (64 bit), JDK 1.7.0_71 (Oracle)


  • Windows 10 Home (64 bit) 1.8.0_77
  • Windows 7 (64 bit) 1.7.0_05 (Oracle)
  • Windows Server 2008 R2 SP1 JDK 1.7.0_04


  • OSX 10 Lion (10.8.5) JDK 1.7.0_40 (Oracle) Node 0.10.17
  • OSX 11 El Capitan (10.11.6) JDK 1.7.0_80 (Oracle) Node 0.10.35


The Ceylon distribution is and contains work released

  • partly under the ASL v2.0 as provided in the LICENSE-ASL file that accompanied this code, and
  • partly under the GPL v2 + Classpath Exception as provided in the LICENSE-GPL-CP file that accompanied this code.

License terms for 3rd Party Works

This software uses a number of other works, the license terms of which are documented in the NOTICE file that accompanied this code.


The content of this code repository, available here on GitHub, is released under the ASL v2.0 as provided in the LICENSE-ASL file that accompanied this code.

By submitting a "pull request" or otherwise contributing to this repository, you agree to license your contribution under the license mentioned above.


We're deeply indebted to the community volunteers who contributed a substantial part of the current Ceylon codebase, working often in their own spare time.

Ceylon is a project of the Eclipse Foundation.