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From EE6 Java servlet code generation for JSP page will be OFF by default and generated servlet code is kept only in memory. This is a change and it should be retested that debugging of JSP pages (and generation of underlying Java code) was not impacted in NetBeans by this change and still works.
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