1. Create JSF 1.2 KickStart project.
2. Open faces-config.xml, Tree view.
3. Select faces-config element. At right panel press "Add"(in phase listener part).
4. In Add phase listener dialog print in phaselistener filed "."(dot) symbol.

Look at warning at top of form. It's so strange...

Screenshot attached.

Same thing in element "Application", "Add new resourse bundle", field "Var".
Same thing in element "Component", "Add component", field "Component-type".
Same thing in element "Managed Beans", "Add new managed bean", field "Name".
Same thing in element "Render Kit", "Add new render kit", field "render-kit-id".
Same thing in element "Validators", "Add new validator", field "Validator-id".

Same behavoir shows some Add dialogs in JSF and Struts web.xml config file.
If u put in nessesary * field "."(dot) symbol - strange warning appears.