java Redirecting Jruby ScriptEngine output to a StringWriter Stack Overflow

This appears to work (I'm using 1.6.1, released last week):

  ScriptEngineManager factory =newScriptEngineManager();
  ScriptEngine engine = factory.getEngineByName("jruby");
  StringWriter sw =newStringWriter();
  PrintWriter pw =newPrintWriter(sw);
  engine.getContext().setWriter(pw);
  engine.eval("puts 'hello'");
  System.out.println("output: "+ sw.getBuffer());