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If you disable whitelist checking in project properties, existing hint doesn't disappear. It happens only in cloud project (not local WebLogic). To reproduce create servlet, type System.exit(-1);, hint should appear, open project properties, uncheck Oracle Public Cloud in Whitelists category but the hint is still visible in editor.
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