网络连接问题

有人说j2me不支持数字域名？是这样吗？下面这个程序就是把某域名下的配置文件的内容打印在控制台，报错（注：我用的wtk2.5.2，我用nokia的s40 5th模拟器竟然报空指针异常）：
java.lang.IllegalArgumentException: malformed URL
at com.sun.midp.io.HttpUrl.isIPv4Address(+88)
at com.sun.midp.io.HttpUrl.parseAfterScheme(+568)
at com.sun.midp.io.HttpUrl.<init>(+36)
at com.sun.midp.io.j2me.http.Protocol.connect(+18)
。。。
程序本身没问题，我试过别的域名，可以正常打印出内容，这个域名本身也应该没错（以前这个项目做过c#版的就用这个域名，我现在做j2me版）这个问题该怎么解决？域名我又无法改变

import javax.microedition.midlet.*;

import javax.microedition.lcdui.*;

import javax.microedition.io.*;

import java.io.*;



public class HttpTest extends MIDlet implements CommandListener{

	private Command exit,start;

	public static Display display;

	private Form form;



	public HttpTest() {

		display = Display.getDisplay(this);

		exit = new Command("Exit",Command.EXIT,1);

		start = new Command("Start",Command.EXIT,1);

		form = new Form("Customer Ranking");

		form.addCommand(exit);

		form.addCommand(start);

		form.setCommandListener(this);

	}



	 protected void startApp() throws MIDletStateChangeException {

	        display.setCurrent(form);

	 }



	 protected void pauseApp() {



	 }



	 protected void destroyApp(boolean arg0) {



	 }



	

	public void commandAction(Command command,Displayable displayable){

		if(command == exit){

			destroyApp(false);

			notifyDestroyed();

		}

		else if(command == start){

			ThreadTest2 t = new ThreadTest2();

			t.start();

		}

	}

}



class ThreadTest2 extends Thread{

	public void run(){

		StreamConnection connection = null;

		InputStream in = null;

		StringBuffer buffer = new StringBuffer();

		try{



			StringBuffer sb = new StringBuffer();

			sb.append("http://weather.infodo.9251.com/getresource/getresource.aspx?");

            sb.append("city=");

            sb.append("北京");

            sb.append("&");

            sb.append("dtype=");

            sb.append("");

            sb.append("&");

            sb.append("imei=");

            sb.append("");

            sb.append("&");

            sb.append("softe=");

            sb.append("v2.0");

            sb.append("&");

            sb.append("mobile=");

            sb.append("");

            sb.append("&");

            sb.append("syse=");

            sb.append("");

            sb.append("&");

            sb.append("username=");

            sb.append("");

            sb.append("&");

            sb.append("email=");

            sb.append("");

            sb.append("&");

            sb.append("settel=");

            sb.append("");

            sb.append("&");

            sb.append("citylist=");

            sb.append("北京;上海;重庆;");

			

			connection = (StreamConnection)Connector.open(sb.toString());

			in = connection.openInputStream();

			int ch;

			while((ch = in.read()) != -1){

				if(ch != '\n'){

					buffer.append((char)ch);

				}

				else{

					String line = new String(buffer.toString()); 

					

					buffer = new StringBuffer();

					System.out.println(line);

				}

			}

		}catch(IOException error){

			Alert alert = new Alert("Error","Cannot connect",null,null);

			alert.setTimeout(Alert.FOREVER);

			alert.setType(AlertType.ERROR);

			HttpExample.display.setCurrent(alert);

		}catch(Exception e){

			e.printStackTrace();

		}

		

	}

}