Public types, methods and fields (API) should be documented
When the 'excludeScope' parameter of the Checkstyle 'Javadoc Variable' rule is set to 'private', even public variable are ignored
The "Undocumented API" rule should log a violation when a @Param or @Return tag is missing
We should keep on excluding public static final fields, which are usually self-descriptive and do not need Javadoc.
Manually tested !