GC is only about 300 lines of code. There's no JNI in TeaVM (and never will be), instead of JNI there's JSO to interact with JavaScript, and still no interop layer for WebAssembly (that's why I claim WASM support to be experimental). JSO is rather lightweight, and I hope I'll be able to implement a lightweigh interop for WASM.
As for Java libraries, TeaVM is able to throw away unused parts of it, producing relatively small binaries.
As for Java libraries, TeaVM is able to throw away unused parts of it, producing relatively small binaries.