Nashorn Under the Hood: Making This Rhinoceros Thunder

on YouTube ↗41m

" summary

Nashorn is a JavaScript runtime in OpenJDK that always compiles to JVM bytecode (no interpreter), using parameter type specialization, static local type inference and optimistic typing to generate tight int/double/object-specialized variants on demand. It uses lazy compilation and on-stack recompile via exception handlers to replace code while running. Practical guidance: reuse a single ScriptEngine, precompile scripts or use single global bindings to cut median latency from hundreds of ms to ~35–60ms; enabling optimistic typing drops median to ~12ms but raises startup from ~3s to ~4.7s (type cache can drop it to ~3.5s).

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" chapters (6)

1. 0:00Introduction to Nashorn
2. 4:19Compiler optimizations
3. 11:16Handling dynamic types
4. 21:08De-optimization mechanism
5. 22:05Integrating with web systems
6. 33:50Advanced tuning and results

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