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@Embeddable object how to discriminate for an object with blank field [message #669523]

Tue, 10 May 2011 15:07

Massimo Ugues

Messages: 10
Registered: January 2011

Junior Member

Hallo all.

I have an Embeddable object where every field is mapped to a CHAR column on DB.

When I have no data on DB eclipse-link recognizes this and does not instantiate the embeddable object.
But when I have some blank chars on one of the properties the object is created and every properties is defaulted to null (except the one with blank chars that is defaulted to "" since eclipselink trims the trailing blank).

Is possible to configure how eclipse-link should handle the creation of the embeddable object?

Kind regards
Massimo

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Re: @Embeddable object how to discriminate for an object with blank field [message #670042 is a reply to message #669523]

Thu, 12 May 2011 13:48

James Sutherland

Messages: 1939
Registered: July 2009
Location: Ottawa, Canada

Senior Member

This can be configured on the AggregateObjectMapping using the setIsNullAllowed(false) API. This can be set using a DescriptorCustomizer on the Entity referencing the Embeddable.

false - will always create an empty instance, true - will use null if all of the field values are null.

If you need anything more complex than that, you could use property access for the mapping and in your set method check the values of the embedded object.

James : Wiki : Book : Blog : Twitter

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