Return-Path: Delivered-To: apmail-db-jdo-dev-archive@www.apache.org Received: (qmail 49276 invoked from network); 22 Jul 2006 23:42:26 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (209.237.227.199) by minotaur.apache.org with SMTP; 22 Jul 2006 23:42:26 -0000 Received: (qmail 48105 invoked by uid 500); 22 Jul 2006 23:42:25 -0000 Mailing-List: contact jdo-dev-help@db.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: jdo-dev@db.apache.org Delivered-To: mailing list jdo-dev@db.apache.org Received: (qmail 48093 invoked by uid 99); 22 Jul 2006 23:42:25 -0000 Received: from asf.osuosl.org (HELO asf.osuosl.org) (140.211.166.49) by apache.org (qpsmtpd/0.29) with ESMTP; Sat, 22 Jul 2006 16:42:25 -0700 X-ASF-Spam-Status: No, hits=0.0 required=10.0 tests=UNPARSEABLE_RELAY X-Spam-Check-By: apache.org Received-SPF: pass (asf.osuosl.org: local policy) Received: from [192.18.42.249] (HELO nwkea-pix-1.sun.com) (192.18.42.249) by apache.org (qpsmtpd/0.29) with ESMTP; Sat, 22 Jul 2006 16:42:23 -0700 Received: from d1-sfbay-05.sun.com ([192.18.39.115]) by nwkea-pix-1.sun.com (8.13.6+Sun/8.12.9) with ESMTP id k6MNg2uG018532 for ; Sat, 22 Jul 2006 16:42:03 -0700 (PDT) Received: from conversion-daemon.d1-sfbay-05.sun.com by d1-sfbay-05.sun.com (Sun Java System Messaging Server 6.2-4.02 (built Sep 9 2005)) id <0J2T00N01W8W1500@d1-sfbay-05.sun.com> (original mail from Craig.Russell@Sun.COM) for jdo-dev@db.apache.org; Sat, 22 Jul 2006 16:42:02 -0700 (PDT) Received: from [192.168.0.10] (c-24-6-172-77.hsd1.ca.comcast.net [24.6.172.77]) by d1-sfbay-05.sun.com (Sun Java System Messaging Server 6.2-4.02 (built Sep 9 2005)) with ESMTPSA id <0J2T00FA7WI2Q660@d1-sfbay-05.sun.com> for jdo-dev@db.apache.org; Sat, 22 Jul 2006 16:42:02 -0700 (PDT) Date: Sat, 22 Jul 2006 16:42:00 -0700 From: Craig L Russell Subject: Advisory: JDO2 Annotation Metadata In-reply-to: <44C0B5BD.6000706@versant.com> Sender: Craig.Russell@Sun.COM To: JDO Expert Group , Apache JDO project Message-id: <4D1586C5-AE43-418A-82F1-F9C77F4FA88E@Sun.COM> MIME-version: 1.0 X-Mailer: Apple Mail (2.752.2) Content-type: multipart/signed; protocol="application/pkcs7-signature"; boundary=Apple-Mail-218--789137924; micalg=sha1 References: <200607050848.02232.andy@jpox.org> <44C0B5BD.6000706@versant.com> X-Virus-Checked: Checked by ClamAV on apache.org X-Spam-Rating: minotaur.apache.org 1.6.2 0/1000/N --Apple-Mail-218--789137924 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed I'd like to get a sense of the community on this proposal based on the recent discussion on the alias. Please provide some feedback. This would be for a JDO 2.1 Maintenance Release. [+1] Right direction, detailed planning can proceed [-1] We need something different (please specify the direction) Proposal: JDO2 will define a complete set of annotations Annotations will be declared in two different packages; jdo annotations would contain only object model metadata, not mapping metadata: * javax.jdo.annotation.jdo * javax.jdo.annotation.orm Annotation documentation will focus on mapping between annotations and the existing xml metadata and will use the identical semantics of xml metadata Compliant implementations that support JDK1.5 will be required to accept annotated classes' metadata If annotated classes are used with xml metadata, xml metadata will override annotation metadata. JDO2 will define interoperability with EJB3/JPA annotations Compliant implementations can optionally use @Entity annotations instead of JDO annotations Mapping from EJB3/JPA to JDO will be defined so as to improve portability of applications from one JDO implementation to others If both JDO and EJB3/JPA annotations are used in the same class we need to choose between: * JDO annotations will override EJB3/JPA annotations * This is illegal 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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