Hibernate Embedded/Embeddable not null exception

In the owning class:

...
@Embedded
private LatLon location;
...

In the referenced class:

@Embeddable
public class Lat开发者_如何转开发Lon implements Serializable {
    private double lat;
    private double lon;
    ...
}

When I try to save an instance of the owning class with a null value for LatLon:

org.hibernate.PropertyValueException: not-null property references a null or transient value: com.*.location.

What can I do to allow this value to be null in the owning class? I have tried making it Nullable and that had no effect.

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It's caused by the fact that you have double properties in your embeddable class, so that Hibernate generates not null columns for them. Change their types to Double.