javax.script cannot be resolved

I try to call functions in javascript with java program.  I found some information and tried implement it.  However, I got this error message," [ERROR] Line 5: The import javax.script cannot be resolved".  What's wrong with my code?

I am using JRE 1.6.0.13 with eclipse.

package com.xenia.googleproject.server;
 
import javax.script.*;
import com.xenia.googleproject.client.GreetingService;
import com.google.gwt.user.server.rpc.RemoteServiceServlet;
 
 
/**
 * The server side implementation of the RPC service.
 */
@SuppressWarnings("serial")
public class GreetingServiceImpl extends RemoteServiceServlet implements
		GreetingService {
 
	public String greetServer(String input) {
		String serverInfo = getServletContext().getServerInfo();
		String userAgent = getThreadLocalRequest().getHeader("User-Agent");
		return "Hello, " + input + "!<br><br>I am running " + serverInfo
				+ ".<br><br>It looks like you are using:<br>" + userAgent;
	}
	
	public String getClientAddr(String latitude, String longitude, String city, String country, String country_code, String region){
		String addr = new String();
		ScriptEngineManager mgr = new ScriptEngineManager();
		ScriptEngine jsEngine = mgr.getEngineByName("JavaScript");
		Invocable invEngine = (Invocable)jsEngine;
 
		
		try{
			jsEngine.eval("function getClientLocation(lat, lng, city, country, country_code, region)"
					);
			invEngine.invokeFunction("getClientLocation", latitude, longitude, city, country, country_code, region);
		} catch (ScriptException ex){
			ex.printStackTrace();
		} catch (NoSuchMethodException ex){
			ex.printStackTrace();
		}
		addr = city;
		
		return addr;
	}
}

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