Registering Converters in JPA 2.1 with EclipseLink

Question

On JavaEE environment, I use JPA 2.1 implementation with EclipseLink,

I have some entities that contain enums. So I have created converters for these enume

Answer 1

Give this a try and ensure you have included the correct packages.

Car entity

Stays the same

import javax.persistence.Convert;

@Entity
public class Car implements Serializable {

    [...]

    @Convert(converter = CarColorConverter.class)
    private CarColor    color;

    [...]
}

CarColor Converter

You only need the empty Annotation

import javax.persistence.AttributeConverter;
import javax.persistence.Converter;

@Converter
public class CarColorConverter implements AttributeConverter {
    [...]
}

persistence.xml

You can either

• declare no class at all

or

• declare every class that is involved.

As soon as you need to declare an entity manually (e.g. when it resists in a library) then you also need do declare all other entity/converter classes.

    

        
        com.xyz.model.converters.CarColorConverter

        
        com.xtz.model.Car

        [...]