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From: Stanimir Stamenkov <s7an10@netscape.net>
Newsgroups: comp.lang.java.databases
Subject: Re: JPA: annotations or XML?
Date: Wed, 25 Dec 2013 13:21:07 +0200
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Xref: csiph.com comp.lang.java.databases:659

Tue, 24 Dec 2013 23:11:01 -0500, /Arne Vajhøj/:
> On 12/16/2013 3:48 PM, Ricardo Palomaes wrote:
>
>>                                so I could use them in both JPA and
>> webservice persistence providers in a DAO architecture, with the web
>> service part not having to include any package from JPA?
> 
> Having JPA annotation on classes used outside DAL is a bit ugly.
> 
> An alternative approach is to have both real data classes and DTO
> classes. But that duplicate some code.

May be one could use internally a subclass for the sole purpose of 
declaring:

@Entity
@AttributeOverrides({
    @AttributeOverride(name="foo", column=@Column("FUN")),
    ...
})
@AssociationOverrides({
    @AssociationOverride(name="bar", joinColumns=@JoinColumn("BAR_ID")),
    ...
})
public class MyDatabaseEntity extends MyBean {

    // Nothing in here.

}

Haven't tried it, though.

-- 
Stanimir