SpringSource/spring-integration — pull request #650 by smokku (2012-10-12 09:57:16+00:00)
Title: Do not provide fixed XMPP resource string

According to RFC 6120 section 7.6. Server-Generated Resource Identifier if the connecting client does not provide resource string, server will generate RANDOM one for it.
Smack API allows this by providing null resource in XMPPConnection#login(username, password, resource) call. See Smack's SASLAuthentication documentation.