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我想在我的JSF應用程序中添加額外的功能，用於將消息發送給我公司的聊天用戶。爲了開發這個項目，我使用了NetBeans v7.1，GlassFish v3.1.1和Smack API 3.2.2。在我的Web應用程序中，我創建了CDI ApplicationScoped bean來管理XMPP連接。集成JSF和XMPP
@Named("xmpp")
@ApplicationScoped
public class XMPPBean implements Serializable {
private org.apache.log4j.Logger loggerErr = org.apache.log4j.Logger.getLogger("err");
private XMPPConnection connection = null;
private String chatHostName = "localhost";
private int chatport = 5222;
private String userName = "testuser";
private String userPass = "12345678";
public void connect(){
ConnectionConfiguration config = new ConnectionConfiguration(chatHostName, chatport);
connection = new XMPPConnection(config);
try {
connection.connect();
connection.login(userName, userPass);
} catch (XMPPException e) {
loggerErr.error(e.getMessage(), e);
}
}
public void sendMessage(){
ChatManager chatmanager = connection.getChatManager();
Chat newChat = chatmanager.createChat("[email protected]", new MessageListener() {
@Override
public void processMessage(Chat chat, Message message) {
System.out.println("Received message: " + " "+message.toXML());
}
});
try {
newChat.sendMessage("Howdy!");
} catch (XMPPException e) {
System.out.println("Error Delivering block");
}
}
public void disconnect() {
connection.disconnect();
}
public boolean chackConnection(){
return connection==null?false:connection.isConnected();
}
public String getLoggedinUser() {
if (connection == null)
return "";
return connection.getUser();
}
}
一切工作正常。我可以連接到XMPP服務器，發送和接收消息。但在我的服務器日誌中我會定期檢查例外：
SEVERE: java.lang.NullPointerException
at org.xmlpull.mxp1.MXParser.isNameStartChar(MXParser.java:3157)
at org.xmlpull.mxp1.MXParser.nextImpl(MXParser.java:1253)
at org.xmlpull.mxp1.MXParser.next(MXParser.java:1093)
at org.jivesoftware.smack.PacketReader.parsePackets(PacketReader.java:325)
at org.jivesoftware.smack.PacketReader.access$000(PacketReader.java:43)
at org.jivesoftware.smack.PacketReader$1.run(PacketReader.java:70)
SEVERE: at org.xmlpull.mxp1.MXParser.isNameStartChar(MXParser.java:3157)
SEVERE: at org.xmlpull.mxp1.MXParser.nextImpl(MXParser.java:1253)
SEVERE: at org.xmlpull.mxp1.MXParser.next(MXParser.java:1093)
SEVERE: at org.jivesoftware.smack.PacketReader.parsePackets(PacketReader.java:325)
SEVERE: at org.jivesoftware.smack.PacketReader.access$000(PacketReader.java:43)
SEVERE: at org.jivesoftware.smack.PacketReader$1.run(PacketReader.java:70)
SEVERE: java.lang.NullPointerException
at org.jivesoftware.smackx.commands.AdHocCommandManager$4.connectionClosedOnError(AdHocCommandManager.java:268)
at org.jivesoftware.smack.PacketReader.notifyConnectionError(PacketReader.java:172)
at org.jivesoftware.smack.PacketReader.parsePackets(PacketReader.java:332)
at org.jivesoftware.smack.PacketReader.access$000(PacketReader.java:43)
at org.jivesoftware.smack.PacketReader$1.run(PacketReader.java:70)
SEVERE: at org.jivesoftware.smackx.commands.AdHocCommandManager$4.connectionClosedOnError(AdHocCommandManager.java:268)
SEVERE: at org.jivesoftware.smack.PacketReader.notifyConnectionError(PacketReader.java:172)
SEVERE: at org.jivesoftware.smack.PacketReader.parsePackets(PacketReader.java:332)
SEVERE: at org.jivesoftware.smack.PacketReader.access$000(PacketReader.java:43)
SEVERE: at org.jivesoftware.smack.PacketReader$1.run(PacketReader.java:70)
這種異常出現之後調用XMPP功能或定期用10-15秒的時間間隔。這個錯誤是什麼以及如何解決它？