Hibernate is mapping BigDecimal incorrectly

Question

I have two @Entitys, both with a BigDecimal field as follows:

in one module:

@Entity
@Table(name = "price_range")
public class PriceRange extends AbstractPersistable<Long> {
    @Column(name = "price", precision = 19, scale = 4)
    private BigDecimal price;

and in another module:

@Entity
@Table(name = "invoice_position")
public class InvoicePosition extends AbstractPersistable<Long> {
    @Column(name = "optimized_cost", precision = 19, scale = 4)
    private BigDecimal optimizedCost;

both create tables in my database with the correct precision and scale values:

Table invoice_position
======================
id,optimized_cost, ...
----------------------
optimized_cost   decimal(19,4)

and

Table price_range
=================
id, price, ...
-----------------
price            decimal(19,4)

A Test Frontend saves the values correctly to the database.

However in a unit test, one of the two returns a value with a rounding error:

0.520000000000000017763568394002504646778106689453125

(debugger says: sacle = 51 and precision = 0)

while the other is working fine:

0.5200

(debugger says: scale = 4, precision = 4)

Both values are retrieved from the database in the same way (with an EntityManager building a CriteriaQuery with a CriteriaBuilder inside a JpaRepository):

List<Invoice> invoices = invoiceProvider.findAll();
List<PriceRange> priceRanges = priceRangeProvider.findAll();

What could be the problem here? Or better: Where could it go wrong, if the Entity has the correct scale and precision and the database as well?

I'm quite at a loss here, where can I look for the error?

Solution

Alright, marking this as answered as per comments with the solution being this