Ceylon command-line distribution
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Ceylon distribution

This is the Milestone 4 "Analytical Engine" release of the Ceylon command line tools (version 0.4). This is a pre-release version of the platform for review by the community.

Ceylon is a programming language for writing large programs in a team environment. The language is elegant, highly readable, extremely typesafe, and makes it easy to get things done. And it's easy to learn for programmers who are familiar with mainstream languages used in business computing. Ceylon has a full-featured Eclipse-based development environment, allowing developers to take best advantage of the powerful static type system. Programs written in Ceylon execute on any Java 7 compatible JVM or Node.js.

Read more about Ceylon at http://ceylon-lang.org.

Distribution layout

  • bin - Unix/Windows commands
  • doc - Documentation about Ceylon including the spec in HTML and PDF format
  • lib - Required libraries for the Ceylon commands
  • repo - Required bootstrap Ceylon modules (language, tools)
  • samples - Sample Ceylon modules
  • templates - Templates for new Ceylon projects
  • LICENSE-ASL - The Ceylon ASL license
  • LICENSE-GPL-CP - The Ceylon GPL/CP license
  • README.md - This file

The command line tools are located in the bin directory.

  • bin/ceylon - The ceylon tool which provides at least the following subcommands:
    • new - Creates a new Ceylon project
    • compile - Compile a Ceylon program for the Java backend
    • compile-js - Compile a Ceylon program for the JavaScript backend
    • doc - Document a Ceylon program
    • run - Run a Ceylon program on the Java VM
    • run-js - Run a Ceylon program on node.js (JavaScript)
    • import-jar - Import a Java .jar file into a Ceylon module repository
    • help - Displays help about another tool

The API documentation for the language module ceylon.language may be found here:

  • repo/ceylon/language/0.4/module-doc

Running the sample programs

To compile and run the samples, start from the distribution directory containing this file.

Sample module

To run the "hello world" program, type:

cd samples/helloworld

For Java:

../../bin/ceylon compile com.example.helloworld
../../bin/ceylon doc --non-shared --source-code com.example.helloworld
../../bin/ceylon run com.example.helloworld/1.0.0 John

For JavaScript:

../../bin/ceylon compile-js com.example.helloworld
../../bin/ceylon run-js com.example.helloworld/1.0.0

Sample with no module

To run a program defined in the default module, type:

cd samples/no-module

For Java:

../../bin/ceylon compile default
../../bin/ceylon doc --non-shared --source-code default
../../bin/ceylon run default

For JavaScript:

../../bin/ceylon compile-js default
../../bin/ceylon run-js default

Sample module with Java interoperability

To run the "Java interop" program, type:

cd samples/interop-java
../../bin/ceylon compile com.example.interop
../../bin/ceylon doc --non-shared --source-code com.example.interop
../../bin/ceylon run com.example.interop/1.0.0 John

Note: this is only available for the Java backend.

Tool usage

To see a list of command line options for a particular subcommand use the help subcommand. For example, to get help on the compile tool:

./bin/ceylon help compile

Ant tasks for Ceylon

We include support for Ceylon ant tasks which are documented on at http://ceylon-lang.org/documentation/1.0/reference/tool/ant/.

To run the "hello world" program using ant, type:

cd samples/helloworld

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 compatible JVM. However we have tested the following platforms to make sure it works:


  • Ubuntu "precise" 12.04 (64 bit) JDK 1.7.0_03 (IcedTea),
  • Fedora 17 (64 bit) JDK 1.7.0_03 (IcedTea)
  • Fedora 16 (64 bit), JDK 1.7.0_b147 (IcedTea)


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


  • OSX 10 Lion (10.7.3) JDK 1.7.0_05 (Oracle)


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. The following people have contributed to this release:

Gavin King, Stéphane Épardaud, Tako Schotanus, Emmanuel Bernard, Tom Bentley, Aleš Justin, David Festal, Flavio Oliveri, Max Rydahl Andersen, Mladen Turk, James Cobb, Tomáš Hradec, Michael Brackx, Ross Tate, Ivo Kasiuk, Enrique Zamudio, Julien Ponge, Julien Viet, Pete Muir, Nicolas Leroux, Brett Cannon, Geoffrey De Smet, Guillaume Lours, Gunnar Morling, Jeff Parsons, Jesse Sightler, Oleg Kulikov, Raimund Klein, Sergej Koščejev, Chris Marshall, Simon Thum, Maia Kozheva, Shelby, Aslak Knutsen, Fabien Meurisse, Paco Soberón, sjur, Xavier Coulon.