How to List Script Engine Factories with the Java Scripting API

import static java.lang.System.out;

import javax.script.ScriptEngineFactory;
import javax.script.ScriptEngineManager;

public class ScriptingSample {

  public static void main(String[] args) {
    ScriptEngineManager manager = new ScriptEngineManager();

    for (ScriptEngineFactory factory : manager.getEngineFactories())

      for (String name : factory.getNames())
        out.println(name);

  }

}