Switching from Rhino to Nashorn

Question

I have a Java 7 project which makes a lot of use of Javascript for scripting various features. Until now I was using Rhino as script engine. I would now like to move to Java

Answer 1

Nashorn can not access an inner class when that inner class is declared private, which Rhino was able to do:

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;

public class Test {
   public static void main(String[] args) {
     Test test = new Test();
     test.run();
   }

   public void run() {
      ScriptEngineManager factory = new ScriptEngineManager();
      ScriptEngine engine = factory.getEngineByName("JavaScript");

      Inner inner = new Inner();
      engine.put("inner", inner);

      try {
         engine.eval("function run(inner){inner.foo(\"test\");} run(inner);");
      } catch (ScriptException e) {
         e.printStackTrace();
      }
   }

   private class Inner {
      public void foo(String msg) {
         System.out.println(msg);
      }
   }
}

Under Java8 this code throws following exception:

javax.script.ScriptException: TypeError: kz.test.Test$Inner@117cd4b has no such function "foo" in  at line number 1
    at jdk.nashorn.api.scripting.NashornScriptEngine.throwAsScriptException(NashornScriptEngine.java:564)
    at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:548)