Can't generate classes that make reference to TemplateServlet. Working ok in console

I am trying to implement the TemplateServlet example. The problem is that groovy plugin does not generate the .class, as soon I make a reference to the class TemplateServlet. Even an explicit import "import groovy.servlet.TemplateServlet" is enough to prevent compilation. If I use "import groovy.servlet.*" there is no matter until I do "new TemplateServlet()"

Libraries I use are:
jetty-6.1.15.jar
jetty-util-6.1.15.jar
Tried both servlet-api-2.5-20081211.jar and servlet-api-2.4.jar
Tried both groovy-all-1.5.7.jar (plugin internal) and groovy-all-1.6.0.jar(downloaded)

The script works fine when I execute it in Groovy Console

Code is:

import org.mortbay.jetty.*;
import org.mortbay.jetty.servlet.*;
import groovy.servlet.*;

def server = new Server(1234);
def root = new Context(server,"/",Context.SESSIONS);
def templateServlet = new TemplateServlet();
def holder = new ServletHolder(templateServlet);
root.setResourceBase(".")
root.addServlet(holder, "*.html")
server.start()