如何自动重新连接到XMPP服务器？

Question

我有一个应该与XMPP服务器保持永久连接的应用程序。 但是每隔2或3天，它就会断开连接，并且无法像预期的那样自动与ReconnectionManager重新连接。

我该怎么做才能查看正在发生的事情和/或对此进行更正？

2018-09-20 07:06:10.887 -  WARN - o.j.smack.AbstractXMPPConnection         : Connection closed with error
java.net.SocketException: Connexion terminée par expiration du délai d'attente (Read failed)
        at java.net.SocketInputStream.socketRead0(Native Method)
        at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
        at java.net.SocketInputStream.read(SocketInputStream.java:171)
        at java.net.SocketInputStream.read(SocketInputStream.java:141)
        at sun.security.ssl.InputRecord.readFully(InputRecord.java:465)
        at sun.security.ssl.InputRecord.read(InputRecord.java:503)
        at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:983)
        at sun.security.ssl.SSLSocketImpl.readDataRecord(SSLSocketImpl.java:940)
        at sun.security.ssl.AppInputStream.read(AppInputStream.java:105)
        at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:284)
        at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:326)
        at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)
        at java.io.InputStreamReader.read(InputStreamReader.java:184)
        at java.io.BufferedReader.fill(BufferedReader.java:161)
        at java.io.BufferedReader.read1(BufferedReader.java:212)
        at java.io.BufferedReader.read(BufferedReader.java:286)
        at org.xmlpull.mxp1.MXParser.fillBuf(MXParser.java:2992)
        at org.xmlpull.mxp1.MXParser.more(MXParser.java:3046)
        at org.xmlpull.mxp1.MXParser.nextImpl(MXParser.java:1144)
        at org.xmlpull.mxp1.MXParser.next(MXParser.java:1093)
        at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketReader.parsePackets(XMPPTCPConnection.java:1177)
        at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketReader.access$300(XMPPTCPConnection.java:956)
        at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketReader$1.run(XMPPTCPConnection.java:971)
        at java.lang.Thread.run(Thread.java:748)

这是我的Connection conf（Spring Java风格的配置）：

  @Bean("xmppConnection")
  public XmppConnectionFactoryBean xmppConnectionFactoryBean() {

    XMPPTCPConnectionConfiguration.Builder configBuilder = XMPPTCPConnectionConfiguration.builder();
    configBuilder.setUsernameAndPassword(appProperties.getXmpp().getUsername(), appProperties.getXmpp().getPassword());
    configBuilder.setServiceName(appProperties.getXmpp().getServiceName());
    configBuilder.setHost(appProperties.getXmpp().getHost());
    int port = appProperties.getXmpp().getPort();
    if (port != 0) {
      configBuilder.setPort(port);
    }
    int timeout = appProperties.getXmpp().getTimeout();
    if (timeout != 0) {
      configBuilder.setConnectTimeout(timeout);
    }
    configBuilder.setDebuggerEnabled(appProperties.getXmpp().isDebuggerEnabled());
    XMPPTCPConnectionConfiguration config = configBuilder.build();

    XmppConnectionFactoryBean connectionFactoryBean = new XmppConnectionFactoryBean();
    connectionFactoryBean.setConnectionConfiguration(config);
    connectionFactoryBean.setSubscriptionMode(null);

    return connectionFactoryBean;
  }

这是Spring Integration conf中使用连接的地方：

<int-xmpp:inbound-channel-adapter id="xmppInboundAdapter" channel="xmppInbound" xmpp-connection="xmppConnection" auto-startup="true" />

更新：要审核此问题，我刚刚向xmppConnection添加了一个侦听器：

  @Bean("xmppConnection")
  public XMPPConnection xmppConnection(XmppConnectionFactoryBean xmppConnectionFactoryBean) throws Exception {
    XMPPConnection xmppConnection = xmppConnectionFactoryBean.getObject();
    xmppConnection.addConnectionListener(new ConnectionListener() {

      @Override
      public void reconnectionSuccessful() {
        logger.info("Successfully reconnected to the XMPP server.");
      }

      @Override
      public void reconnectionFailed(Exception arg0) {
        logger.info("Failed to reconnect to the XMPP server.");
      }

      @Override
      public void reconnectingIn(int seconds) {
        logger.info("Reconnecting in " + seconds + " seconds.");
      }

      @Override
      public void connectionClosedOnError(Exception arg0) {
        logger.error("Connection to XMPP server was lost.");
      }

      @Override
      public void connectionClosed() {
        logger.info("XMPP connection was closed.");
      }

      @Override
      public void connected(XMPPConnection connection) {
        logger.info("Connected to XMPP server.");        
      }

      @Override
      public void authenticated(XMPPConnection connection, boolean resumed) {
        logger.info("Authenticated to XMPP server.");        
      }
    });

    return xmppConnection;

  }

更新2：现在启动了审计，我可以看到：

2018-10-03 07:29:39.442 - ERROR - f.e.r.l.i.xmpp.config.XmppManagerConfig  : Connection to XMPP server was lost.

但绝不要“重新连接”或“无法重新连接”。

Answer 1

嗨，我希望您正在使用最新版本的smack 4.3.0

默认情况下，如果突然断开连接，Smack将尝试重新连接。 重新连接管理器将尝试立即重新连接到服务器，并增加尝试之间的延迟，因为连续的重新连接持续失败。

如果要在重新连接管理器等待下一次重新连接时强制重新连接，则可以只使用AbstractXMPPConnection#connect()进行新的尝试。 如果手动尝试也失败，则重新连接管理器仍将继续进行重新连接作业。