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Compiler of Java bytecode to JavaScript
Java C JavaScript HTML Shell CSS
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Type Name Latest commit message Commit time
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.idea IDEA: fix inspection settings Jan 27, 2020
all-deps C backend: initial commit Mar 20, 2018
classlib Fix of exporting a wasm function for scala objects (#498). Fix #497 May 18, 2020
core Fix class initialization optimization May 19, 2020
extras-slf4j Update version to 0.7.0 Sep 24, 2019
html4j Further work on decreasing generated code size Mar 3, 2020
interop/core Update version to 0.7.0 Sep 24, 2019
jso added module names form JPMS Apr 1, 2020
metaprogramming added module names form JPMS Apr 1, 2020
platform Improve <clinit> elimination. Improve inlining in ADVANCED optimizati… Feb 14, 2020
samples Update Scala to 2.12.11 Apr 1, 2020
tests Fix class initialization optimization May 19, 2020
tools Minor improvements to time zone support Apr 30, 2020
.gitignore Remove outdated methodAliases build parameter Jan 9, 2018
.travis.yml Travis: deploy CLI project to Maven repository Oct 1, 2019
LICENSE Applies apache license Dec 20, 2013
NOTICE Borrow some code from Joda Time to parse tz data and expose offsets. Add May 13, 2015 More explanations about license in readme Oct 7, 2019
checkstyle.xml Add support for more Nov 9, 2017
license-regexp.txt Fix build. Apply rules to some classes of teavm-classlib Jul 23, 2015
pom.xml prevent javadoc error: The code being documented uses modules but the… Apr 1, 2020 Don't update Eclipse plugin in Sep 7, 2019
travis-settings.xml Set version to 0.5.0-SNAPSHOT. Add configuration to deploy to bintray… Feb 16, 2017 Update upper supported IDEA version Feb 5, 2020


Build Status Maven Central Bintray Gitter chat Code Quality: Java Total Alerts

See documentation at the project web site.

Useful links:

Building TeaVM

Simply clone source code (git clone and run maven build (mvn clean install). You can do things a little faster (mvn clean -DskipTests) or even a little more faster (mvn clean -DskipTests

Preview builds

You may want to access new features and don't want to wait until stable release is published on Maven Central. In this case you can get latest development build from bintray. All you need is to put the following in your pom.xml:


IDEA plugin is also available in preview builds. You need to add corresponding repository manually to IDEA. Open Settings -> Plugins -> Browse repositories... -> Manage repositories..., click Add button and enter Then get back to Browse repositories and pick TeaVM plugin from list.

Embedding TeaVM

If you are not satisfied with Maven, you can embed TeaVM in your program or even create your own plugin for any build tool, like Ant or Gradle. The starting point for you may be org.teavm.tooling.TeaVMTool class from teavm-tooling artifact. You may want to go deeper and use org.teavm.vm.TeaVM from teavm-core artifact, learn how TeaVMTool initializes it. To learn how to use TeaVMTool class itself, find its usages across project source code. You most likely encounter Maven and IDEA plugins.

Please, notice that these APIs for embedding are still unstable and may change between versions.


WebAssembly support is in experimental status. It may lack major features available in JavaScript backend. There's no documentation yet and you should do many things by hands (like embedding generated wasm file into your page, importing JavaScript objects, etc). Look at samples/benchmark module. You should first examine pom.xml file to learn how to build wasm file from Java. Then you may want to examine index-teavm.html and index-teavm.js to learn how to embed WebAssembly into your web page.


TeaVM is distributed under Apache License 2.0. TeaVM does not rely on OpenJDK or code or other (L)GPL code. TeaVM has its own reimplementation of Java class library, which is either implemented from scratch or based on non-(L)GPL projects:

If you want to contribute code to implementation of Java class library, please make sure it's no based on OpenJDK or other code licensed under (L)GPL.


More information is available at the official site:

Ask your questions by email: Also you can report issues on a project's issue tracker.

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