Lambda_UnusedMethod.java 12 Method is never used. MethodRef_UnusedMethod.java 12 Method is never used. Lambda_UnusedMethodInHierarchy.java 12 Method is never used as a member of this interface, but only as a member of the implementation class(es). The project will stay compilable if the method is removed from the interface. MethodRef_UnusedMethodInHierarchy.java 14 Method is never used as a member of this interface, but only as a member of the implementation class(es). The project will stay compilable if the method is removed from the interface.