I have Jboss 3.2 with bundled Tomcat, and it will accept no concurrent requests. For example, there is one routine that a session bean occasionally must do that takes about 5 minutes but maybe uses between 10-15% of the CPU.
During this 5 minutes, I cannot make any request of the server. The CPU load stays at 10-15%. As soon as the aforementioned bean is done with its processing, the request goes through.
We're using Cocoon for our front-end. I did try increasing the minProcessors and maxProcessors etc in the tomcat41-service.xml file, but to no avail.