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我想在我的 JSF 应用程序中添加额外的功能，用于向我公司的聊天用户发送消息。为了开发这个项目，我使用 NetBeans v7.1、GlassFish v3.1.1 和 Smack API 3.2.2。在我的 Web 应用程序中，我创建了 CDI ApplicationScoped bean 来管理 XMPP 连接。

@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("anotheruser@127.0.0.1", 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();                   
    }       

}

一切正常。我可以连接到 XMPP 服务器，发送和接收消息。但是在我的服务器日志中，我会定期看到异常：

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)

此异常出现在调用 XMPP 函数后或每隔 10-15 秒定期出现。这是什么错误以及如何解决？

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1 回答 1

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只是不要忘记断开会话。

检查你的 jabber 连接是否总是在重新部署战争包时断开。

于 2012-07-28T21:27:03.840 回答