Thanks to you @TwoSteps and all the @_CG_Team, Groovy language seems to build again 
… so pleased !
Unfortunately, as i said in the Happy Numbers forum ([Community Puzzle] Happy Numbers - #40 by Jp82), all my Tests pass successfully in Groovy, in this puzzle too … but none of the Validators 
!
→ Is there another (or the same) mistake in my code ?
Thanks to anyone who can help to solve the problem 
!