我在网络应用中使用smack 3.2.2将邮件从一个Gmail ID发送到另一个。我的应用程序在我的本地主机（localhost：8080 / app）中工作正常，但当我把它放在远程服务器（www.example.com:8080/App）时，它显示我connection.getUser()为空且login fail because of username and password is incorrect 。但如果用户名和密码不正确，它怎么能在我的localhost中工作？它也抛出
org.jivesoftware.smack.sasl.SASLErrorException：使用PLAIN的SASLError： 未授权的
异常。相同的代码在localhost中有效，但在远程服务器中无效。
connConfig = new ConnectionConfiguration（“talk.google.com”，5222， “gmail.com”）; connection = new XMPPConnection（connConfig）; connection.connect（）;
connConfig.setSASLAuthenticationEnabled（假）; SASLAuthentication.supportSASLMechanism（“PLAIN”，0）;
connection.login（用户名，密码）;
并且还得到了
Error! A startup class specified in smack-config.xml could not be loaded: org.jivesoftware.smackx.ServiceDiscoveryManager
Error! A startup class specified in smack-config.xml could not be loaded: org.jivesoftware.smackx.XHTMLManager
Error! A startup class specified in smack-config.xml could not be loaded: org.jivesoftware.smackx.muc.MultiUserChat
Error! A startup class specified in smack-config.xml could not be loaded: org.jivesoftware.smackx.bytestreams.ibb.InBandBytestreamManager
Error! A startup class specified in smack-config.xml could not be loaded: org.jivesoftware.smackx.bytestreams.socks5.Socks5BytestreamManager
Error! A startup class specified in smack-config.xml could not be loaded: org.jivesoftware.smackx.filetransfer.FileTransferManager
Error! A startup class specified in smack-config.xml could not be loaded: org.jivesoftware.smackx.LastActivityManager
Error! A startup class specified in smack-config.xml could not be loaded: org.jivesoftware.smackx.commands.AdHocCommandManager
Error! A startup class specified in smack-config.xml could not be loaded: org.jivesoftware.smackx.ServiceDiscoveryManager
Error! A startup class specified in smack-config.xml could not be loaded: org.jivesoftware.smackx.XHTMLManager
Error! A startup class specified in smack-config.xml could not be loaded: org.jivesoftware.smackx.muc.MultiUserChat
Error! A startup class specified in smack-config.xml could not be loaded: org.jivesoftware.smackx.bytestreams.ibb.InBandBytestreamManager
Error! A startup class specified in smack-config.xml could not be loaded: org.jivesoftware.smackx.bytestreams.socks5.Socks5BytestreamManager
Error! A startup class specified in smack-config.xml could not be loaded: org.jivesoftware.smackx.filetransfer.FileTransferManager
Error! A startup class specified in smack-config.xml could not be loaded: org.jivesoftware.smackx.LastActivityManager
Error! A startup class specified in smack-config.xml could not be loaded: org.jivesoftware.smackx.commands.AdHocCommandManager
forbidden(403) Username or password not correct.
at org.jivesoftware.smack.NonSASLAuthentication.authenticate(NonSASLAuthentication.java:109)