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See documentation at the project web site.

Useful links:

Building TeaVM

Simply clone source code (git clone and run Gradle build (./gradlew publishToMavenLocal or gradlew.bat publishToMavenLocal). You should build samples separately, as described in corresponding readme file.

Useful Gradle tasks

  • :tools:classlib-comparison-gen:build – build Java class library compatibility report. result is available at: tools/classlib-comparison-gen/build/jcl-support

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 not 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.