Another Repeated column in mapping for entity error

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The message is clear: you have a repeated column in the mapping. That means you mapped the same database column twice. And indeed, you have:

@Column(nullable=false)
private Long customerId;

and also:

@ManyToOne(optional=false)
@JoinColumn(name="customerId",referencedColumnName="id_customer")
private Customer customer;

(and the same goes for productId/product).

You shouldn’t reference other entities by their ID, but by a direct reference to the entity. Remove the customerId field, it’s useless. And do the same for productId. If you want the customer ID of a sale, you just need to do this: 

sale.getCustomer().getId()

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