Re: [OT] Recommendation of Instant Messagging System

[Erik Weber]

I just finished putting together a system with a Swing client and 
combined services over XMPP and HTTP.

I think Leon's suggestion of doing your own is not bad, if you are good 
with Sockets, ServerSockets, XML APIs and Threads (find a good tutorial 
on building a chat system such as in the ubiquitous "Thinking in Java"). 
There is also JMS which gives you a low-level core. If you want 
something higher level, just get Smack from jivesoftware.com, which will 
give you an OO interface to Jabber (XMPP). Then get jabberd from 
jabber.org. jabberd 1.4  is small, written in C and gets the job done 
for what you are talking about, so I would start with that. They are 
working on the 2.0 "enterprise" version.

I will warn you that while Smack is a great library (you'll get classes 
such as "Chat", "Packet", "Message", "Presence", etc.), there are some 
pitfalls related to Threading to watch out for. I rewrote about a half 
dozen of the core classes. Fortunately, Smack operates with just two 
main disptach Threads so once you spend some time with the PacketReader 
and XMPPConnection classes, you'll figure it out. Apache license, too.

Erik
masegui wrote:
The requirements are these:
1. A user has a list of the other users in the system. He can click a
button that initiates a conversation with the selected user. The other
user can accept or not the conversation. If accepts, a "chat room" is
opened and now then can have a conversation. The rooms only accept 2
people. We would like a user to be able to have several conversations at
a time, but each conversation only between 2 people.
Thanks in advance.
Miquel Angel Segui
 

<-----Original Message-----> 
From: Leon Rosenberg
Sent: 4/5/2005 10:50:38 AM
To: user@struts.apache.org
Subject: Re: [OT] Recommendation of Instant Messagging System

if your only functionality is to allow users to send each other
   

messages 
 

which are embedded in the site (html, or something, but no 
standalone-desktop solutions) forget about existing systems and 
implement it by yourself. 
I have implemented dozens of such systems over the time, it's normally 
about 100 locs, much less effort than an integration of an existing 
system is. 

maybe you could tell us a bit more, about the requirements of the 
system, so we could give you more specific answer. 

regards 
Leon 

On Wed, 2005-05-04 at 08:13 +0200, Miquel Angel wrote: 
   

We are developing an application (struts 1.1 + Tomcat 5.5 + Java
     

1.4). One 
 

of the requirements is to implement an instant messaging system for
     

the 
 

users of the site (the system should not be very complex). Do you
     

mind to 
 

share your experience in using this system. We are looking for free
     

or non 
 

free systems. 

Thanks in advance. 

Miquel Angel Segui 


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