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Let's say that you have a JSP Tag file, so here you can put Java code in order to make some kind of component, the problem is that if you use a class that you change the name using rename refactoring, the JSPs are not updated and throw exceptions at runtime. Refactoring of classes should work for those classes invoked in JSPs
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