Calling a java class in a JSP file

Hello,
I have a jsp file in which I call a java class.
I work with Tomcat 4.0.1
If I modify the java class and then I execute my JSP, it still be the old version of my class that is executed.
I don't understand why since if I creates a main function and I execute it, it works correctly!
Do you know what is the problem?
Thanks

i also have this problem.when i modify jsp file,it didn't execute inmediately. Then i restart tomcat,but problem also exist.
a few minute age,i execute jsp file again,it can appear the modified jsp.i don't down why
i work tomcat 5.0 windowxp

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Calling a java class in a JSP file

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