[hibernate-dev] Java 6, 7 and 8... oh my!

[Gunnar Morling]

Hi,

Can you share the exact exception/error you get when using the generated
model with Java 6? The required() attribute already exists as of Java 6 [1].

You should be able to make the generated code Java 6 compatible by either
setting the right options for XJC (the JAXB code generator) or in the worst
case by falling back to an older version of XJC. I had a quick look, this
setting looks promising:

    -target (2.0|2.1): Avoid generating code that relies on any JAXB
2.1|2.2 features. This will allow the generated code to run with JAXB 2.0
runtime (such as JavaSE 6.)

That being said, I think it'd be fine to require Java 7 for ORM 5. OGM,
Search and also many other libraries have done that move by now.

--Gunnar

[1]
http://docs.oracle.com/javase/6/docs/api/javax/xml/bind/annotation/XmlElement.html#required()



2015-04-01 2:04 GMT+02:00 Steve Ebersole <steve at hibernate.org>:

> 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?
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