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See the following screenshot attached to issue 129597: http://www.netbeans.org/nonav/issues/showattachment.cgi/60181/updated_screen_cap_of_JSP_errors.JPG Looks like the Struts Tiles library defines a variable propType that is then used in scriptlet code: <tiles:useAttribute name="propertyType" id="propType" classname="java.lang.String" /> JSP editor does not recognize this, and marks the occurrences of propType in the scriptlet as errors. These should be taken into account and supported. Maybe there needs to be some more generic support for variables defined by taglibs? If not and this is Tiles-specific, feel free to reassign to Struts category.
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