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Code completion does not display correctly when using a extended object that base is a generic typed. This issue can be shown with Primefaces Demo. Download and setup the PrimeFaces Lazy datatable example from https://www.primefaces.org/showcase/ui/data/datatable/lazy.xhtml. The base example code completion works as expected with the private LazyDataModel<Car> lazyModel; But if you change it to private LazyCarDataModel lazyModel; and change the associated getter. You'll discover that code completion shows LazyDataModel functions and attributes to autocomplete and not the expected car functions and attributes.