Return-Path: Delivered-To: apmail-incubator-open-jpa-dev-archive@locus.apache.org Received: (qmail 69396 invoked from network); 12 Apr 2007 15:58:25 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.2) by minotaur.apache.org with SMTP; 12 Apr 2007 15:58:25 -0000 Received: (qmail 586 invoked by uid 500); 12 Apr 2007 15:58:31 -0000 Delivered-To: apmail-incubator-open-jpa-dev-archive@incubator.apache.org Received: (qmail 559 invoked by uid 500); 12 Apr 2007 15:58:31 -0000 Mailing-List: contact open-jpa-dev-help@incubator.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: open-jpa-dev@incubator.apache.org Delivered-To: mailing list open-jpa-dev@incubator.apache.org Received: (qmail 548 invoked by uid 99); 12 Apr 2007 15:58:31 -0000 Received: from herse.apache.org (HELO herse.apache.org) (140.211.11.133) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 12 Apr 2007 08:58:31 -0700 X-ASF-Spam-Status: No, hits=0.0 required=10.0 tests=UNPARSEABLE_RELAY X-Spam-Check-By: apache.org Received-SPF: pass (herse.apache.org: local policy) Received: from [192.18.42.249] (HELO nwk-ea-fw-1.sun.com) (192.18.42.249) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 12 Apr 2007 08:58:20 -0700 Received: from d1-sfbay-09.sun.com ([192.18.39.119]) by nwk-ea-fw-1.sun.com (8.13.6+Sun/8.12.9) with ESMTP id l3CFw0MR014146 for ; Thu, 12 Apr 2007 08:58:00 -0700 (PDT) Received: from conversion-daemon.d1-sfbay-09.sun.com by d1-sfbay-09.sun.com (Sun Java System Messaging Server 6.2-6.01 (built Apr 3 2006)) id <0JGE00A016VSF700@d1-sfbay-09.sun.com> (original mail from Craig.Russell@Sun.COM) for open-jpa-dev@incubator.apache.org; Thu, 12 Apr 2007 08:58:00 -0700 (PDT) Received: from [129.145.132.34] by d1-sfbay-09.sun.com (Sun Java System Messaging Server 6.2-6.01 (built Apr 3 2006)) with ESMTPSA id <0JGE008UW70KZF50@d1-sfbay-09.sun.com> for open-jpa-dev@incubator.apache.org; Thu, 12 Apr 2007 08:57:56 -0700 (PDT) Date: Thu, 12 Apr 2007 08:57:56 -0700 From: Craig L Russell Subject: Re: state-of-the art attribute initialization in persistent pojos? In-reply-to: <000001c77d19$5fa93e90$140aa8c0@burns> Sender: Craig.Russell@Sun.COM To: open-jpa-dev@incubator.apache.org Message-id: <7FC3568F-0CD3-4A30-845A-8D3F345157D2@SUN.com> MIME-version: 1.0 X-Mailer: Apple Mail (2.752.3) Content-type: multipart/signed; protocol="application/pkcs7-signature"; boundary=Apple-Mail-185-517780583; micalg=sha1 References: <000001c77d19$5fa93e90$140aa8c0@burns> X-Virus-Checked: Checked by ClamAV on apache.org --Apple-Mail-185-517780583 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Hi Hans, On Apr 12, 2007, at 8:43 AM, Hans J. Prueller wrote: > hi, > as you know I am switching from EJB2.1 CMP to JPA (OpenJPA). I'd > like to know the preferred way to perform attribute initialisation > of newly created entity instances, e.g. we initialized our EJB2.1 > CMP entity beans with > > ejbCreate(String cid, Integer someOtherValue) > { > setabc(); > setdef(); > } > > //and ejbPostCreate optionally > > as far as I know, the JPA spec requires a no-arg constructor - so > when providing a constructor with the same args that we have used > in ejbCreate before, we cannot ensure that some developer calls the > no-arg constructor by default. The no-arg constructor can be private. The reason it's required is so the implementation doesn't have to guess what the right values are for final variables. But there's no requirement to make this constructor available to your applications. > > is there any other-more elegant way to force new entity instance > initialization? There's no requirement for an ejbCreate and a separate ejbPostCreate for relationships. So you are really free to do whatever you like for the application contract. Have as many constructors as you like and put whatever initialization into them. Just don't initialize the values of generated fields... Craig > > regards, > > HANS > > =========================== > virtually hanzz... > > http://hanzz.zapto.org (personal) > http://www.cse.dmu.ac.uk/~hansp > (research) Craig Russell Architect, Sun Java Enterprise System http://java.sun.com/products/jdo 408 276-5638 mailto:Craig.Russell@sun.com P.S. A good JDO? 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