I want to develop a chat application for my product. Its done in java and spring .
The people in my product have there own domain name.
can you suggest any good third party tool, which is free.
What about XMPP (the open protocol which is used by, amongst others, GTalk)? Have a look at http://code.google.com/appengine/docs/java/xmpp/overview.html
You question is very broad but you could take a look at http://java-source.net/open-source/chat-servers for Open-Source Chat Servers written in Java. But these are actual servers that run and clients connect to. As you mentioned a domain-name you might want a Web Based Chat Solution, check out - http://chipchat.sourceforge.net/ - for this.
Update Users want a Web Based solution using a Comet Approach
Maybe try - http://avricot.com/blog/index.php?post/2009/05/19/AvriChat-%3A-Real-time-Chat-Javascript-Comet-and-Java-Server or - http://cometdaily.com/2009/10/23/concrete-comet-examples/ also shows a example of chat with comment
Please try Google it has all the information you will ever need.
来源：https://stackoverflow.com/questions/5483103/third-party-tool-for-chat