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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