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When you compile a JSP page, servlet is generated. Then you can see this servlet by choose View Servlet from popup menu. If you change JSP file, you should be noticed, that Servlet isn't corresponding to the JSP. As good way, how to do it is small text behind the servlet name in editor title. For example [outdated].
Will not be done in Boston
*** Issue 53247 has been marked as a duplicate of this issue. ***
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss