title: String expression interpolation support in java scripting engines
body: <p>I'm using groovy/nashorn as java engine but not able to interpolate Strings.</p>
  
  <pre><code>jdk.nashorn.api.scripting.NashornScriptEngine  scriptEngine =(NashornScriptEngine) factory.getEngineByName("nashorn");
  ScriptContext context = scriptEngine.getContext();
  Bindings bindings = context.getBindings(ScriptContext.ENGINE_SCOPE);
  bindings.put("x","Guest");
  engine.eval("Hello, ${x}",context);
  </code></pre>
  
  <p>But I'm getting javax.script.ScriptException.
  Is Sttring interpolation supported?
  Thanks</p>