The JVM Meets WASI: Writing Cloud-Friendly Wasm Apps Using Java and Friends
summary
Shows how to produce WASI WebAssembly from Java/Kotlin bytecode using TeaVM, then run it with a Wasm runtime for strong sandboxing and fast cold starts. Presents a TVM-wazzy fork plus generated Java bindings (wit-bindgen) and benchmarks: OpenJDK wins raw throughput, but TVM+wasmtime is competitive once sandboxing is required. Demonstrates a working Spin app that loads a file-backed English→Spanish dictionary, serves HTTP, and deploys to Fermion Cloud, with the demo and repos linked for code, benchmarks, and binding generator.
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chapters (9)
- 0:00Start
- 1:00A Polyglot Vision for WebAssembly
- 4:08Concepts & Tools: Java Bytecode
- 5:11Concepts & Tools: WebAssembly
- 6:44TeaVM-WASI and wit-bindgen
- 8:34When to prefer the JVM
- 12:21Performance
- 15:29Limitations
- 17:13Next Steps
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