I am using Apache1.3.20 with mod_ssl + tomcat3.3 + mod_jk + Solaris 8 + Jdk1.2.2(green threads) I have a simple web application in tomcat. Using apachebenchmarking tool (ab) to generate many requests to my application via apache, I find that the allocated java heap continuously increases. On the other hand, generating many requests to my application directly to tomcat, I find that the allocated java heap remains unchanged. I change my application to a simple jsp. The above scenarios still exists. Can anyone tell me why?? Have I set anything wrong in apache or tomcat?? Thx. and Regards. Steve.