Preformatted textSmack-4.4.0-alpha3-SNAPSHOT has ConcurrentModificationException in XmlStringBuilder#appendXmlTo() as shown in aTalk capture log below
believe to be caused by object LazyStringBuilder sb;
2019-10-03 10:00:52.429 18487-19125/org.atalk.android I/aTalk: [23497] org.jivesoftware.smack.AbstractXMPPConnection.notifyConnectionError() Connection was already disconnected when attempting to handle java.util.ConcurrentModificationException
java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.next(ArrayList.java:860)
at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1084)
at org.jivesoftware.smack.util.XmlStringBuilder.appendXmlTo(XmlStringBuilder.java:642)
at org.jivesoftware.smack.util.XmlStringBuilder.write(XmlStringBuilder.java:622)
at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketWriter.writePackets(XMPPTCPConnection.java:1352)
at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketWriter.access$3400(XMPPTCPConnection.java:1159)
at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketWriter$1.run(XMPPTCPConnection.java:1211)
at java.lang.Thread.run(Thread.java:764)
After I applied a simple source changed as below to eliminate ConcurrentModificationException i.e.
private void appendXmlTo(Appendable appendable, XmlEnvironment enclosingXmlEnvironment) throws IOException {
List<CharSequence> sbList = new ArrayList<>();
sbList.addAll(sb.getAsList());
for (CharSequence csq : sbList) {
if (csq instanceof XmlStringBuilder) {
((XmlStringBuilder) csq).appendXmlTo(appendable, enclosingXmlEnvironment);
}
else if (csq instanceof XmlNsAttribute) {
XmlNsAttribute xmlNsAttribute = (XmlNsAttribute) csq;
if (!xmlNsAttribute.value.equals(enclosingXmlEnvironment.getEffectiveNamespace())) {
sb.append(xmlNsAttribute);
enclosingXmlEnvironment = new XmlEnvironment(xmlNsAttribute.value);
}
}
else {
appendable.append(csq);
}
}
}
However user login in still failed as the last stanza sent from aTalk has empty content?
i.e.: <starttls> </starttls>
Any advice what can be the problem.
2019-10-03 11:22:57.620 30907-31230/org.atalk.android D/SMACK: SENT (0):
<stream:stream xmlns='jabber:client' to='atalk.org' xmlns:stream='http://etherx.jabber.org/streams' version='1.0' xml:lang='en-GB'>
2019-10-03 11:22:57.641 30907-31231/org.atalk.android D/SMACK: RECV (0): ?xml version='1.0'?>
<stream:stream id='2565774255654660775' version='1.0' xml:lang='en-GB' xmlns:stream='http://etherx.jabber.org/streams' from='atalk.org' xmlns='jabber:client'>
<stream:features>
<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'>
<required/>
</starttls>
</stream:features>
2019-10-03 11:22:57.645 30907-31230/org.atalk.android D/SMACK: SENT (0):
<starttls>
</starttls>
2019-10-03 11:23:27.607 30907-31231/org.atalk.android D/SMACK: RECV (0):
<stream:error>
<connection-timeout xmlns='urn:ietf:params:xml:ns:xmpp-streams'/>
<text xml:lang='en' xmlns='urn:ietf:params:xml:ns:xmpp-streams'>
Idle connection
</text>
</stream:error>
</stream:stream>