asmack 注册不了.......大婶，帮帮忙

Question

xmppconn.getConnection().sendPacket(reg);到这就出问题，大婶 。。帮帮忙
一：用的asmack-android-17-0.8.3.jar
二：所有代码
System.out.println("----->register");
Registration reg = new Registration();
reg.setType(IQ.Type.SET);
String bb= xmppconn.getConnection().getServiceName();
reg.setTo(xmppconn.getConnection().getServiceName());
reg.setUsername(username);
reg.setPassword(password);
reg.addAttribute("android", "geolo_createUser_android");
System.out.println("reg:" + reg);
PacketFilter filter = new AndFilter(new PacketIDFilter(
reg.getPacketID()), new PacketTypeFilter(IQ.class));
PacketCollector collector = xmppconn.getConnection()
.createPacketCollector(filter);

            xmppconn.getConnection().sendPacket(reg);
            result = (IQ) collector.nextResult(SmackConfiguration
                    .getPacketReplyTimeout());
            // Stop queuing results
            collector.cancel();// 停止请求results（是否成功的结果）

            if (result == null) {
                Toast.makeText(getApplicationContext(), "服务器没有返回结果",
                        Toast.LENGTH_SHORT).show();
            } else if (result.getType() == IQ.Type.ERROR) {
                if (result.getError().toString()
                        .equalsIgnoreCase("conflict(409)")) {
                    Toast.makeText(getApplicationContext(), "这个账号已经存在",
                            Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(getApplicationContext(), "注册失败",
                            Toast.LENGTH_SHORT).show();
                }
            } else if (result.getType() == IQ.Type.RESULT) {
                Toast.makeText(getApplicationContext(), "恭喜你注册成功",
                        Toast.LENGTH_SHORT).show();
            }

xmppconn的代码如下

private static void openConnection() {
try {
// url、端口，也可以设置连接的服务器名字，地址，端口，用户。
ConnectionConfiguration connConfig = new ConnectionConfiguration(
"xxx.xxx.xxx.xxx", 5222);
connection = new XMPPConnection(connConfig);
connection.connect();
} catch (XMPPException xe) {
xe.printStackTrace();
}
}

public static XMPPConnection getConnection() {
    try {
        if (connection == null) {
            configure(ProviderManager.getInstance());
            openConnection();
        }
    } catch (Exception e) {
        // TODO: handle exception
    }
    return connection;
}