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Flex application is just a view in your traditional web application. Quite a rich view with embedded MVC in it, but still a view. If you have a your default view in JSP, does it matter how many users open (thru http get request) it simultaneously? I don't think so.
Similarly, it doesn't matter how may user open the same view done if Flex. Sever would send the SWF file to the client browser which will run in the flash player VM in the browser of the client.
Now concurrency is a more valid question! But again, the concern of the concurrency is solved at the web application container level not at the flex/jsp or any other client level.
So it's your Tomcat sever config along with your database performance that would determine the concurrency issues, not whether you client is a servlet/jsp or a flex.
Hope this helps.
Thank you for your reply.
For server performance, is there any difference between tomcat and JRun?
Thanks a lot!
Frankly, I'm not an expert on either of those.
some time ago I played with the Flex data services and JRun and the docu explicitly mentioned that the JRun server should just be used for development environment and not in a productive system. Didn´t found any reason for that, but I think the reason will be that the jrun server has a poor performance in productive system.