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Created attachment 121065 [details] nb project test case highlighting the issues described Against build 201206180001 JSF Editor happily lives with deprecated methods in a facelet. Code completion (ctrl-space) happily serves up deprecated methods without the strikeout you have in the java editor. Existing references to deprecated methods/properties are not tagged in any way in a facelet. Not underlined in yellow, not marked with a strikeout. Test case attached. It is a big deal on a big project where you have lots of managed beans and lots of facelets.
it is more an enhancement as the JSF/EL support has never done this.
I'm afraid of regressions in this period which "fixing" of this would definitely bring. I'm targeting this for the next release. In any case it's good idea to support this.
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