Nashorn

the hidden weapon of JDK 8

Nashorn

lightweight, high perf JavaScript runtime

successor of Rhino (4x faster, ES5.1)

seamless Java <-> JavaScript integration

JS > bytecode > JVM

Nashorn

performance comparison

Rhino 800ms

Nashorn 200ms

V8 100ms

Nashorn

// instantiate Nashorn engine
NashornScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");

// load and evaluate JavaScript code
try {
    engine.eval(read("path/to/some/javascript/code.js"));
} catch (ScriptException e) {
    throw new RuntimeException(e);
}

// execute a function from the loaded JavaScript file
Object result = engine.invokeFunction("someFunction", someDataObject);

// do something with the retrieved result
doSomethingWith(result);

Spike

prove that

Nashorn + React.js

is a viable approach

?

Spike

✔ ran some JavaScript code through Nashorn

✔ rendered a React component using Nashorn

✔ injected results into Seller login page

(via FreeMarker template)

Spike

demo!