Had a quick look into (1). The "target" parameter is not supported by that version of the Ant task currently in use. If I change the class name of the Ant task from "org.jvnet.jaxb2_commons.xjc.XJC2Task" into "com.sun.tools.xjc.XJC2Task", the "target" parameter is recognized and setting it to "2.0" causes no required() attribute to be generated for @XmlElementRef.
Do you remember why that task from JAXB Commons is used rather than the original XJC one? 2015-04-02 15:19 GMT+02:00 Steve Ebersole <st...@hibernate.org>: > After considering this some more, I think moving to Java 8 as baseline is > just not reasonable yet. And tbh I just do not see a compelling reason to > move to Java 7 as the baseline. So if reasonably possible I would still > like to remain backwards compatible with Java 6. > > The only hurdle I believe is this JAXB point. I see 2 options... > > 1) Make certain our code is compatible with JAXB 2.0. I am not well versed > enough in JAXB features between its versions yet to know how good of an > idea this is. > > 2) make our codr compatible with the newer JAXB version. This works as-is > in Java 7 and 8 runtimes. For use in Java 6 runtimes, users would need to > update the JAXB used in their JDK/JRE. Doing so is a well defined process > using endorsed libs. See > http://docs.oracle.com/javase/6/docs/technotes/guides/standards/index.html > > I think option (1) is the way to go, but do not have a lot of experience > here. What do y'all think? > On Apr 1, 2015 6:34 AM, "Steve Ebersole" <st...@hibernate.org> wrote: > > > Baseline on Java 8? Hmm... Well thanks for tempting me :) > > > > What do you mean by "be able to experiment with significant API > > improvements"? > > > > On Tue, Mar 31, 2015 at 7:18 PM, Sanne Grinovero <sa...@hibernate.org> > > wrote: > > > >> I wouldn't disagree on requiring Java 7. > >> I probably wouldn't disagree with Java 8 either, after all we're not > >> removing older versions of Hibernate from any download location and > >> we'll still support and maintain some older versions. It would > >> actually be nice to have the latest ORM version to be able to > >> experiment with significant API improvements. > >> > >> FYI Hibernate Search is requiring Java 7 already, and our CI servers > >> are already testing our projects with JDK9 as well. > >> > >> That said, Java 6 is still being supported by some vendors. Not by > >> Oracle, but Red Hat and SAP will support it for much longer. > >> > >> -- Sanne > >> > >> On 1 April 2015 at 01:04, Steve Ebersole <st...@hibernate.org> wrote: > >> > So we now have to deal with a multi-jdk build in Hibernate ORM. We > need > >> > Java 8 in order to compile the new hibernate-java8 module. > >> > > >> > I wanted to remain compatible with Java 6 for the rest. However, I > ran > >> > into a snag there because of JAXB which we now use (in conjunction > with > >> > StAX) to process XML in ORM. ANyway, the JAX generation creates a > model > >> > that is only compatible with Java 7. I have not yet had time to > >> > investigate this deeply. But it has to do with a change in the > >> definition > >> > of javax.xml.bind.annotation.XmlElement and a change in its definition > >> > between 1.6 and 1.7 to add a new > >> > attribute javax.xml.bind.annotation.XmlElement#required. > >> > > >> > If anyone is familiar with this situation, I'd love to hear some > options > >> > before I spend a lot of time investigating it. > >> > > >> > The other option is that we say we are going to drop Java 6 support > >> since > >> > it has been unsupported now for, what, 3 years? > >> > _______________________________________________ > >> > hibernate-dev mailing list > >> > hibernate-dev@lists.jboss.org > >> > https://lists.jboss.org/mailman/listinfo/hibernate-dev > >> > > > > > _______________________________________________ > hibernate-dev mailing list > hibernate-dev@lists.jboss.org > https://lists.jboss.org/mailman/listinfo/hibernate-dev > _______________________________________________ hibernate-dev mailing list hibernate-dev@lists.jboss.org https://lists.jboss.org/mailman/listinfo/hibernate-dev
