使用Smack碰到若干问题的解决

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public class XmppTest {        public static void main(String[] args) throws Exception {                String username = "userName@serverName.com";        String password = "your password";                XmppManager xmppManager = new XmppManager("serverName.com", 5222);        System.out.println("连接服务器成功！");        xmppManager.init();        System.out.println("初始化成功！");        xmppManager.performLogin(username, password);        System.out.println("登录成功！");               xmppManager.setStatus(true, "Hello everyone");                String buddyJID = "friend@serverName.com";        String buddyName = "friend";        xmppManager.createEntry(buddyJID, buddyName);                xmppManager.sendMessage("Hello mate", "friend@serverName.com");        System.out.println("发送消息成功！");        boolean isRunning = true;                while (isRunning) {            Thread.sleep(50);        }                xmppManager.destroy();            }}