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I think you are missing the implementation of auto accepting Group chat joining Request in your code.Below code is working for AMACK group chat using Openfire Server1. Creating XMPP Connection XMPPTCPConnection connection = new XMPPTCPConnection(config); connection.connect(); connection.login(ID1, password1); Presence presence = new Presence(Presence.Type.available); connection.sendPacket(presen..

What protocols do they use?Application like Whats app,G-talk ,facebook etc they uses XMPP protocol for IM services.What is XMPP?The Extensible Messaging and Presence Protocol (XMPP) is an open technology for real-time communication, using the Extensible Markup Language (XML) as the base format for exchanging information. In essence, XMPP provides a way to send small pieces of XML from one entity..