I have resolve my problem. It's very odd. It's the place of the operator...
query &= Eq('portal_type', 'J_Product')
query &= Eq('review_state', 'published')
I replace this by :
query = query & Eq('portal_type', 'J_Product')
query = query & Eq('review_state', 'published')
It's work :)
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