How to map private fields of parent class when using @ExternalEntity with SubClass, cannot modify parent class or subclass as they are used as an external library.

[ankitchandkaushik]

** Please ask your question and provide whatever background or supporting information you think might be relevant: **
How to map private fields of parent class when using @ExternalEntity with SubClass, cannot modify parent class or subclass as they are used as an external library.

I have a base class...

public abstract class Base {

    private String field1;
    public String getField1() {
        return field1;
    }

    public void setField1(String field1) {
        this.field1 = field1;
    }

}

and Sub class..

public class SubClass extends Base {
    private String field2;
    private String field3;
}

I want to Map SubClass class using @ExternalEntity

@ExternalEntity(target = SubClass.class)
public class MapSubClass {
    private String field1;
    private String field2;
    private String field3;
}

but this produces error

dev.morphia.mapping.MappingException: Mapped field 'field1' on 'MapSubClass' does not match any fields on 'SubClass'

how to fix this issue?

** Please complete the following information: **
Server Version: 5.0
Driver Version: 4.10.2
Morphia Version: 2.3.8

[evanchooly]

You would map using the method lookup.