Prevent user from making to many requests...

Hallo everybody,
We are using Tomcat 5.0 and have some large jsp's (reports) that consume large memory.
1. Is there an easy way to prevent a user from making to many requests (eg. if he refreshes the page too many times, Tomcat gets an Out-of-memory error).
Of cource increasing the memory is not the answer I'm looking for (already did that).
2. Or may be a way to retrict a user to a certain maximum of memory
This seems like a common problem; anyone have good advice?
Thanks in advance.
Marcus

The main reason for multiple refreshes is the report taking too long to run and users getting impatient? Or is there another reason.
1 - Give the users fair warning. Put a message on the page saying "this report takes time to run. do NOT refresh this page as then the report will take even longer"
2 - You might set it up as a two stage process. Generate the report to a file. Then give them a link to check the progress of the report or load it if it is finished.
That way when they refresh, they don't regenerate the report, but just get back a immediate response that tells them "come back later"
3 - Perhaps you might consider the synchronizer token pattern.
http://www.javaworld.com/javaworld/javatips/jw-javatip136.html
4 - restricting users to max amount of memory would be difficult. How do you tell it is the same user? You could use a session variable, and record how many reports they have currently running, and reject any more then 3-4 requests at one time. But that could be worked around quite easily - just open up a new browser and its a new session.

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