Smack连接到谷歌的XMPP服务(gtalk)引发异常"SASLError使用PLAIN:未授权"

Question

我正在尝试使用SMACK API连接到gmail,但得到以下错误,我在过去的2天内陷入困境.

Exception in thread "main" org.jivesoftware.smack.sasl.SASLErrorException: SASLError using PLAIN: not-authorized
at org.jivesoftware.smack.SASLAuthentication.authenticate(SASLAuthentication.java:348)
at org.jivesoftware.smack.tcp.XMPPTCPConnection.login(XMPPTCPConnection.java:244)
at org.jivesoftware.smack.XMPPConnection.login(XMPPConnection.java:442)

我正在使用smack 4.0.3 jar和Java 7.我的办公网络中没有阻止gmail.我已经厌倦了论坛中提出的所有建议.

1. setting SASLMechanism to PLAIN / DIGEST-MD5.   
2. adding the Thread.sleep delay after connect.  
3. by setting the dummy SSLSocketFactory. 
4. removing the domain name from user name. 

下面是我试图执行的代码.

public class JabberExample {
public static void main(String[] args) throws Exception{

    XMPPTCPConnection con = new XMPPTCPConnection("gmail.com");
    SASLAuthentication.supportSASLMechanism("PLAIN",0);

    con.connect();
    con.login("username", "password");

    Chat chat = ChatManager.getInstanceFor(con).createChat("chatusernam@gmail.com", new MessageListener() {
         public void processMessage(Chat chat, Message message) {
             System.out.println("Received message: " + message);
         }
     });

    chat.sendMessage("Message..!!");

     con.disconnect();
}

}

我希望我能在这里得到一些建议和帮助.

Answer 1

谷歌最近已改用其帐户不允许使用PLAIN和类似方法 - https://support.google.com/accounts/answer/6010255.

如果您想使用此类身份验证机制,则该帐户需要启用它们 - https://www.google.com/settings/security/lesssecureapps