Provide a hibernate config with some property elements, which values should be class names. Make these elements empty (in XML terms) like: See that errors (empty class name) are indicated so: . There is no error undelining (underwaving). . Error background color (if any) is set to trailing space, e.g. it starts after "/>" tokens. . Error gutters are provided (this point is Ok). So, editor looks some confusing in this case.