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android中 的xmpp连接服务器总是出非法状态异常异常是怎么回事?有时候还说服务器找不到?

04-24 00:51:37.885: W/System.err(329): java.lang.IllegalStateException: Not connected to server.
04-24 00:51:37.885: W/System.err(329):  at org.jivesoftware.smack.XMPPConnection.sendPacket(XMPPConnection.java:488)
04-24 00:51:37.885: W/System.err(329):  at org.jivesoftware.smack.NonSASLAuthentication.authenticate(NonSASLAuthentication.java:69)
04-24 00:51:37.895: W/System.err(329):  at org.jivesoftware.smack.SASLAuthentication.authenticate(SASLAuthentication.java:353)
04-24 00:51:37.895: W/System.err(329):  at org.jivesoftware.smack.XMPPConnection.login(XMPPConnection.java:230)
04-24 00:51:37.895: W/System.err(329):  at org.jivesoftware.smack.Connection.login(Connection.java:353)
04-24 00:51:37.895: W/System.err(329):  at com.wxs.model.User.login(User.java:200)
04-24 00:51:37.895: W/System.err(329):  at com.wechat.project.activity.LoginAcitivity$4$1.run(LoginAcitivity.java:78)
04-24 00:51:37.905: W/System.err(329):  at java.lang.Thread.run(Thread.java:1096)
android xmpp openfire
补充:移动开发 ,  Android
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