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Presence.toXml() does not write type attribute


Does type attribute in Presence class is an optional field?

In the source code, it does not write to xml when type is available. (in red color)

public XmlStringBuilder toXML() {
XmlStringBuilder buf = new XmlStringBuilder();
if (type != Type.available) {
buf.attribute(“type”, type);

I am new to smack, any help is really appreciated.


The type attribute is implicit and must be omitted if its value is ‘available’.

Available presence is not specified as extra “type” value. A presence is implicitly “available”, if there’s no type attribute.

RFC 6121:

In XMPP, an entity’s availability is signaled when its client generates a stanza with no ‘type’ attribute

<xs:attribute name=‘type’ use=‘optional’>


<xs:restriction base=‘xs:NMTOKEN’>

<xs:enumeration value=‘error’/>

<xs:enumeration value=‘probe’/>

<xs:enumeration value=‘subscribe’/>

<xs:enumeration value=‘subscribed’/>

<xs:enumeration value=‘unavailable’/>

<xs:enumeration value=‘unsubscribe’/>

<xs:enumeration value=‘unsubscribed’/>




But in the RosterListener,

How do I check if a user is available in the RosterListener. presenceChanged(presence) ?

Currently, I call presence.getType() and it always returns unavailable although i set the Presence of the other user to available.

Roster roster = Roster.getInstanceFor(con); roster.addRosterListener(new RosterListener() { // Ignored events public void entriesAdded(Collection<String> addresses) {} public void entriesDeleted(Collection<String> addresses) {} public void entriesUpdated(Collection<String> addresses) {} public void presenceChanged(Presence presence) { System.out.println("Presence changed: " + presence.getFrom() + " " + presence);

if (presence.getType() == Presence.Type.available) {

//update UI

** }** } });

And from Presence.isAvailable()


  • Returns true if the {@link Type presence type} is available (online) and
  • false if the user is unavailable (offline), or if this is a presence packet
  • involved in a subscription operation. This is a convenience method
  • equivalent to getType() == Presence.Type.available. Note that even
  • when the user is available, their presence mode may be {@link Mode#away away},
  • {@link Mode#xa extended away} or {@link Mode#dnd do not disturb}. Use
  • {@link #isAway()} to determine if the user is away.
  • @return true if the presence type is available.
    public boolean isAvailable() {

return type == Type.available;

And Thank you for your fast reply!

As it turn out, my Presence subscribe had a problem.

To get the presenceChanged callback correctly, user need to send Presence(subscribe) to the other user.

Thank you