Hibernate component mapping of an immutable object

Question

I have an immutable object which is a member of a Hibernate persisted object using component mapping. Example, PinDrop corresponds to a table, which has a field of type immutable Point:

public class PinDrop {
    private String name;
    private Point location;
    // Getters and setters for name and location
}

// Immutable Point
public class Point {
    private final double x;
    private final double y;
    // Getters for x and y, no setters
}

In my PinDrop.hbm.xml:

<property name="name" column="name" type="string"/>
<component name="location" class="Point>
    <property name="x" column="location_x" type="double"/>
    <property name="y" column="location_y" type="double"/>
</component>

This doesn't work because at runtime Hibernate complains that Point doesn't have setters for x and y. Is there a way to use an immutable object as a component of a Hibernate persistent object?

Follow-up: I'm not using annotations, but rather hbm.xml. Neither mutable nor immutable are valid attributes on component and property in hbm.xml.

Answer 1

You can tell hibernate to use field access (attribute access=field in your hbm) so hibernate won't complains about missing accessors.

Hibernate use reflection to modify the final fields so it should work.