We might also have a look at {{@Convert}} and {{@Converter}} of JPA 2.1. It is somehow similar to the third option. It also offers an auto-convert option which comes back to the original proposal. I kind of like the idea of aligning the two approaches.
Here are the examples from the JPA spec:
{code}
@Converter
public class BooleanToIntegerConverter implements AttributeConverter<Boolean, Integer> { ... }
@Entity
public class Employee {
@Id long id;
@Convert(converter=BooleanToIntegerConverter.class)
boolean fullTime;
...
}
{code}
{code}
@Converter(autoApply=true)
public class EmployeeDateConverter implements AttributeConverter<com.acme.EmployeeDate, java.sql.Date> {
... }
@Entity
public class Employee {
@Id long id;
...
// EmployeeDateConverter is applied automatically
EmployeeDate startDate;
}
{code}
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