I have the following situation: I am working on a project where I initially used 3 servlets and everything worked great, the problem was when I tried to create a fourth servert. For some reason that I have not been able to understand, no JSP wanted to connect with that last servlet (the classic HTTP Status 404 – Not found: The required resource […] is not available appears), it connects with any of the other three, and with their respective GET and POST, thus demonstrating that the problem is not in Apache Tomcat, but it simply does not do so with this room. It should be noted that I have verified it and indeed I have no writing errors. I don’t know if there is some limitation on the number of servlet options that are allowed to be used, so my project is limited to a maximum of three servlets, or if it is some other kind of problem. As a development environment I am using NetBeans.