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我被这个问题困扰好几天了，请各位帮帮我吧，谢谢！

richluo

发贴: 1
积分: 0

于 2004-11-30 12:35

异常：Cannot create class in system package。是怎么回事啊？
我在学习Nokia一个用sip传输消息的demo。把其中的代码copy到eclipse里面。把包package com.nokia.phone.ri.sip.examples去掉并换成默认的包。没有报错，可是在run的时候却发生错误，错误如下：
Running with storage root DefaultColorPhone
java.lang.NoClassDefFoundError: SendMessage: javax/microedition/sip/SipClientConnectionListener: Cannot create class in system package
at com.sun.midp.midlet.MIDletState.createMIDlet(+14)
at com.sun.midp.midlet.Scheduler.schedule(+52)
at com.sun.midp.main.Main.runLocalClass(+28)
at com.sun.midp.main.Main.main(+116)
Execution completed.
456980 bytecodes executed
3 thread switches
489 classes in the system (including system classes)
2694 dynamic objects allocated (79008 bytes)
3 garbage collections (60308 bytes collected)

代码如下：

import java.util.*;
import java.io.*;
import javax.microedition.io.*;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

import javax.microedition.sip.*;

public class SendMessage extends MIDlet implements CommandListener, SipClientConnectionListener {

private Display display;
private long startTime;
private Form form;
private TextField address;
private TextField subject;
private TextField message;
private Command sendCmd;
private Command exitCmd;

public SendMessage() {
System.out.println("MIDlet: SendMessage starting...");
display=Display.getDisplay(this);
form = new Form("Message example");
address = new TextField("Address", "sip:user@10.128.0.50:5070", 30, TextField.LAYOUT_LEFT);
subject = new TextField("Subject", "test", 30, TextField.LAYOUT_LEFT);
message = new TextField("Message text", "test message...", 30, TextField.LAYOUT_LEFT);
form.append(address);
form.append(subject);
form.append(message);
sendCmd = new Command("Send", Command.ITEM, 1);
form.addCommand(sendCmd);
exitCmd = new Command("Exit", Command.EXIT, 1);
form.addCommand(exitCmd);
form.setCommandListener(this);
}

public void commandAction(Command c, Displayable d) {
if(c == sendCmd) {
Thread t = new Thread() {
public void run() {
sendMessage();
}
};
t.start();
}
if(c == exitCmd) {
destroyApp(true);
}
}

public void startApp() {
display.setCurrent(form);
System.out.println("MIDlet: SendMessage startApp()");
}

private void sendMessage() {
SipClientConnection sc = null;
try {
sc = (SipClientConnection) Connector.open(address.getString());
sc.setListener(this);
String text = message.getString();
sc.initRequest("MESSAGE", null);
sc.setHeader("Subject", subject.getString());
sc.setHeader("Content-Type", "text/plain");
sc.setHeader("Content-Length", ""+text.length());
OutputStream os = sc.openContentOutputStream();
os.write(text.getBytes());
os.close(); // close and send out
startTime = System.currentTimeMillis();

} catch(Exception ex) {
ex.printStackTrace();
}
}

public void notifyResponse(SipClientConnection scc) {
try {
System.out.println("MIDlet: waited "+(System.currentTimeMillis()-startTime)+" secs");
scc.receive(1);
form.append("notifyResponse: "+scc.getStatusCode()+" "+scc.getReasonPhrase());
scc.close();
} catch(Exception ex) {
form.append("MIDlet: exception "+ex.getMessage());
}
}

public void pauseApp() {
System.out.println("MIDlet: pauseApp()");
}
public void destroyApp(boolean b) {
System.out.println("MIDlet: destroyApp()");
notifyDestroyed();
}

}

这到底是怎么回事啊!!大家谁能帮我看看，谢了！

作者	Re:我被这个问题困扰好几天了，请各位帮帮我吧，谢谢！ [Re:richluo]
itren 发贴: 23 积分: 10	于 2004-12-09 15:59 你没有打包成 jar的吧..

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