Tester.java

import javax.script.*;
import jdk.nashorn.api.scripting.NashornScriptEngineFactory;
import jdk.nashorn.api.scripting.NashornScriptEngine;

public class Tester {
  static class NashornThread extends Thread {
    private Bindings runner;
    
    NashornThread(String name, Bindings runner){
      super(name);
      this.runner = runner;
    }

    public void run() {
      try {
        for (long i = 0; i < new Long("10000000000"); i++) {
          engine.invokeMethod(runner, "run", i);
          //System.out.println(getName() + ":" + );
        }
      }catch(Exception e ){
        System.out.println("Error: " + e);
      }
    
      System.out.println("Done with " + getName());
    }
  }

  private static final NashornScriptEngineFactory engineFactory = new NashornScriptEngineFactory();
  private static final NashornScriptEngine engine = (NashornScriptEngine) engineFactory.getScriptEngine();

  public static void main(String[] args) throws Exception {
    ScriptEngine e = new ScriptEngineManager().getEngineByName("nashorn");
    Bindings runner = (Bindings) engine.compile("runner = { run: function(foo){ return foo * 2 } }; runner").eval();
    
      
    Tester foo = new Tester();
    NashornThread threads[] = new NashornThread[4];
    for (int i = 0; i < 4; i++) {
      threads[i] = new NashornThread(String.valueOf(i), runner);
      threads[i].start();
    }
  }  
}