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The JSP parser should provide information on variables defined by custom tag handlers. See issue 85957
The information are already provided. You can obtain obtain it from a TagInfo class method TagVariableInfo[] getTagVariableInfos();. The TagInfos you can obtain from TagLibraries infos and the list of used TagLibraries is available through the PageInfo. You have to find out which tags are used in the jsp page. These information is not available now, but you can build it from nodes tree of jsp and custom tags. The solution should work, but probably there should be a support for such cases in the jsp parser. Something like getTagVariableInfos(int offset) in the jsp parser. The jsp parser will find out list of custom tags from the node tree, which has information about jsp and custom tags in a text form. From this tree we should be able to build a stack of used tags (tagInfos) until the offset and collect all variables defined by the used tags. Probably I will not have time to do such support in the jsp parser in NetBeans 6.0 time frame, because it's new functionality, which requires bigger effort.
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