A DESCRIPTION OF THE PROBLEM :
The doc contains a possible implementation for the call syntax of JavaScript.
This code is wrong for the case of a zero-length argument array.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
String ret = obj;
      ret += "." + m + "(";
      for (int i = 0; i < args.length; i++) {
          ret += args[i];
          if (i < args.length - 1) {
              ret += ",";
          }
      }
      ret += ")";
      return ret;
ACTUAL -
String ret = obj;
      ret += "." + m + "(";
      for (int i = 0; i < args.length; i++) {
          ret += args[i];
          if (i == args.length - 1) {
              ret += ")";
          } else {
              ret += ",";
          }
      }
      return ret;

URL OF FAULTY DOCUMENTATION :
http://java.sun.com/javase/6/docs/api/javax/script/ScriptEngineFactory.html