“无法解析 Presence 数据包中的扩展数据包”错误，导致断开连接，带有 Smack

Question

我已经实现了一个聊天客户端，它可以永远在线，并向不同的 XMPP 用户发送消息。此客户端连接到 ejabberd 服务器，并使用 Smack 在 java 中实现。

恰好在 1 分钟后，客户端下线，然后在将近 15 秒后重新上线。显示在客户端控制台上的日志如下：

java.io.EOFException: no more data available - expected end tag </stream:stream> to close start tag <stream:stream> from line 1, parser stopped on END_TAG seen...erd.cloudservicesplatform.biz/cspb2\' id=\'t5f8L-12\' type=\'result\'/>... @1:1264
at org.xmlpull.mxp1.MXParser.fillBuf(MXParser.java:3035)
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.PacketReader.parsePackets(PacketReader.java:279)
at org.jivesoftware.smack.PacketReader.access$000(PacketReader.java:44)
at org.jivesoftware.smack.PacketReader$1.run(PacketReader.java:70)
Failed to parse extension packet in Presence packet.
java.io.EOFException: no more data available - expected end tag </stream:stream> to close start tag <stream:stream> from line 1, parser stopped on END_TAG seen
...<query xmlns=\'jabber:iq:version\'/>\n</iq>... @6:6
at org.xmlpull.mxp1.MXParser.fillBuf(MXParser.java:3035)
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.PacketReader.parsePackets(PacketReader.java:279)
at org.jivesoftware.smack.PacketReader.access$000(PacketReader.java:44)
at org.jivesoftware.smack.PacketReader$1.run(PacketReader.java:70)
Failed to parse extension packet in Presence packet.
java.io.EOFException: no more data available - expected end tag </stream:stream> to close start tag <stream:stream> from line 1, parser stopped on END_TAG seen
...=\'cspbox107@dev-ejabberd.cloudservicesplatform.biz\'/></query></iq>... @6:292
at org.xmlpull.mxp1.MXParser.fillBuf(MXParser.java:3035)
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.PacketReader.parsePackets(PacketReader.java:279)
at org.jivesoftware.smack.PacketReader.access$000(PacketReader.java:44)
at org.jivesoftware.smack.PacketReader$1.run(PacketReader.java:70)
Failed to parse extension packet in Presence packet.

Answer 1

3.3.0 之前的 Smack 在收到格式错误的出席信息节时会抛出异常。使用SMACK-390 更改了此行为。

你应该：

• 更新到最新的 Smack 版本（即在撰写本文时为 3.4.1）
• 告知错误节的来源库/程序的开发人员有关该错误的信息

编辑：仔细查看日志后，由于您没有提及使用的 Smack 版本，您似乎也可能只是收到了导致断开连接的格式错误的节（这将是一个不可恢复的错误，即使在 Smack 3.4.1 上）。