We use Persistant-Objects with keys as "String" like this:

public class TestPOJO {
private String key = null;
}

and a mapping with string as type:
<id name="key" type="string" column="test_id".. >
</id>

but our database uses integer, big-integer our guid as type.

is this conversion from integer or bint to string correct and valid ?

Hai

I hope the conversion is worng and invalid.