Hibernate loss of precision in results when mapping a number (22,21) to BigDecimal

Question

I have this column in my Oracle 11g mapped as NUMBER (21,20), which is mapped in Hibernate as:

@Column(name = \"PESO\", precision = 21, scale = 20, nullable          


        

Answer 1

It's a result of initializing BigDecimal from double:

System.out.println(String.format("%21.20f", new BigDecimal(0.493)); 
// Prints 0,49299999999999999378  

So, when BigDecimal initialized this way is saved in the database, it produces an inaccurate value, which is correctly loaded later.

If BigDecimal is initialized by string or if the value is set directly in Java everything works fine.