Question

我正在使用Smack Java库（版本4.3.1）（JDK 8）。经过一些随机的时间后，我有时会遇到以下异常。有什么办法可以避免吗？

org.jivesoftware.smack.SmackException$NotConnectedException: The connection [...] (117) is no longer connected. done=true smResumptionPossible=false at
org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketWriter.throwNotConnectedExceptionIfDoneAndResumptionNotPossible(XMPPTCPConnection.java:1320) at
org.jivesoftware.smack.tcp.XMPPTCPConnection.throwNotConnectedExceptionIfAppropriate(XMPPTCPConnection.java:359) at 
org.jivesoftware.smack.AbstractXMPPConnection.sendStanza(AbstractXMPPConnection.java:688)

XMPPTCPConnectionConfiguration：

XMPPTCPConnectionConfiguration.builder(
        ).setSecurityMode(
            ConnectionConfiguration.SecurityMode.disabled
        ).setXmppDomain(
            this.domain
        ).setHostAddress(
            InetAddress.getByName(
                this.host
            )
        )
        .allowEmptyOrNullUsernames(
        ).performSaslAnonymousAuthentication(
        ).build();

XMPPTCPConnection：

conn.setReplyTimeout(30 * 1000);
conn.setUseStreamManagement(true);
conn.setUseStreamManagementResumption(true);
conn.connect();
conn.login();

Maven Central工件：

    <artifactId>smack-core</artifactId>
    <version>4.3.1</version>

    <artifactId>smack-tcp</artifactId>
    <version>4.3.1</version>

    <artifactId>smack-extensions</artifactId>
    <version>4.3.1</version>

    <artifactId>smack-java7</artifactId>
    <version>4.3.1</version>

    <artifactId>smack-resolver-dnsjava</artifactId>
    <version>4.3.1</version>

其他信息：问题是conn.isConnected返回true。在内部，Smack在发送节（conn.sendStanza）之前执行以下检查：If（{conn.isConnected）然后if（conn.isSmResumptionPossible）然后sendStanza()。如果conn.isSmResumptionPossible()返回false，则抛出我得到的异常。

Answer 1

安装连接侦听器，如果侦听器的回调告诉您连接断开，则重新连接。

Answer 2

以下是帮助我缓解此问题的原因：

 final XMPPTCPConnection conn = new XMPPTCPConnection(config);  
 conn.setReplyTimeout(30_000);
 conn.setUseStreamManagement(true);
 conn.setUseStreamManagementResumption(true);
 conn.setPreferredResumptionTime(5);
 ReconnectionManager.getInstanceFor(conn).enableAutomaticReconnection();
 PingManager.getInstanceFor(conn).setPingInterval(60);

Smack XMPP-连接不再连接。 done = true smResumptionPossible = false

2 个答案: