users@jaxb.java.net

Re: How to force JAXB to generate correct output for derived classes

From: Sergey Beryozkin <sergey.beryozkin_at_iona.com>
Date: Tue, 21 Jul 2009 07:13:42 -0700 (PDT)

I don't quite follow it.

I'm simply asking why the method which has already been generated and is
available on the ObjectFactory is ignored, what is the point of generating
such methods ?

I'm also asking when such ObjectFactory JAXBElement getters are being used ?
Consider a set of classes being generated from a schema, like the one Karen
provided. It's not always possible to go and add @XmlRootElement to every
generated class. So I thought that is where ObjectFactory would help, as
guess what, it already has all the JAXBElement getters generated.

So why is it that such a getter is not picked up ? I'm about to provide to
provide a generic JAXBElement wrapper facility anyway but I'd like to
understand why ObjectFactory is not being utilized

cheers, Sergey


Wolfgang Laun-2 wrote:
>
> On Tue, Jul 21, 2009 at 3:29 PM, Sergey Beryozkin
> <sergey.beryozkin_at_iona.com
>> wrote:
>
>>
>> Hi
>>
>> thanks. Can you explain please why a similar method in ObjectFactory is
>> not
>> picked up ?
>
>
> Because tailors sell you a suit and not cloth, needle and yarn ;-)
>
> Seriously now: the generated code is supposed the regular case of a schema
> binding.
> If you want to add all sorts of extensions - where do you draw the line?
>
> -W
>
>
>>
>> The generated factory does have a method returning JAXBElement<BaseType>.
>> I thought that if I remove @XmlRootElement on BaseType/DerivedType then
>> this
>> method will be picked up, but it's not, JAXB does expect DerivedType to
>> have
>> @XmlRootElement, when DerivedType is serialized directly.
>>
>> Do such ObjectFactory methods used only when class members of List
>> type/etc
>> are being serialized ?
>> cheers, Sergey
>>
>>
>> Wolfgang Laun-2 wrote:
>> >
>> > With this simple method
>> >
>> > <T> JAXBElement<T> wrap( String ns, String tag, T o ){
>> > QName qtag = new QName( ns, tag );
>> > Class<?> clazz = o.getClass();
>> > @SuppressWarnings( "unchecked" )
>> > JAXBElement<T> jbe = new JAXBElement( qtag, clazz, o );
>> > return jbe;
>> > }
>> >
>> > you do
>> > DerivedType doc = of.createDerivedType();
>> > JAXBElement<DerivedType> jbe = wrap( "", "base", doc );
>> >
>> > and you'll get
>> >
>> > <base xsi:type="DerivedType" xmlns:xsi="
>> > http://www.w3.org/2001/XMLSchema-instance">
>> > ...
>> > </base>
>> >
>> > -W
>> >
>> > On Tue, Jul 21, 2009 at 2:21 PM, Qzpmwo <qzpmwo_at_gmail.com> wrote:
>> >
>> >>
>> >> As I understand, since I did not specify substitution group correct
>> xml
>> >> should be:
>> >>
>> >> <base xsi:type="derivedType>...</base>
>> >>
>> >> Let me know if my understanding of XSD/XML is wrong.
>> >>
>> >> Thanks
>> >> --- Karen
>> >>
>> >>
>> >> Wolfgang Laun-2 wrote:
>> >> >
>> >> > What do you see that is wrong?
>> >> > -W
>> >> >
>> >> >
>> >> >
>> >> > On Mon, Jul 20, 2009 at 7:05 PM, Qzpmwo <qzpmwo_at_gmail.com> wrote:
>> >> >
>> >> >>
>> >> >> Hi,
>> >> >>
>> >> >> I'm having a problem with derived schema types and XML generated by
>> >> JAXB.
>> >> >>
>> >> >> Basically I'm having a schema like:
>> >> >>
>> >> >> <xs:schema>
>> >> >>
>> >> >> <xs:complexType name="BaseType">
>> >> >> <xs:sequence>
>> >> >> </xs:sequence>
>> >> >> </xs:complexType>
>> >> >>
>> >> >> <xs:complexType name="DerivedType">
>> >> >> <xs:complexContent>
>> >> >> <xs:extension base="BaseType">
>> >> >> <xs:sequence>
>> >> >> </xs:sequence>
>> >> >> </xs:extension>
>> >> >> </xs:complexContent>
>> >> >> </xs:complexType>
>> >> >>
>> >> >> <xs:complexType name="ListType">
>> >> >> <xs:sequence>
>> >> >> <xs:element name="item" type="BaseType"
>> minOccurs="0"
>> >> >> maxOccurs="unbounded" />
>> >> >> </xs:sequence>
>> >> >> </xs:complexType>
>> >> >>
>> >> >> <xs:element name="base" type="BaseType" />
>> >> >> <xs:element name="derived" type="DerivedType" />
>> >> >> <xs:element name="list" type="ListType" />
>> >> >>
>> >> >> </xs:schema>
>> >> >>
>> >> >> XJC is used to generate java classes from this schema.
>> >> >>
>> >> >> 1) @XmlSeeAlso pointing to DerivedType class and @XmlRootElement
>> >> >> annotations have been added to BaseType java class code
>> >> >> 2) @XmlRootElement has been added to DerivedType java class code
>> >> >> 3) @XmlRootElement has been added to ListType java class code
>> >> >>
>> >> >> Right xml is produced when I'm using ListType
>> >> >>
>> >> >> <list>
>> >> >> <base xsi:type="DerivedType">...</base>
>> >> >> ...
>> >> >> </list>
>> >> >>
>> >> >> But when I'm trying to get single object of the DerivedType, I see
>> >> wrong
>> >> >> xml
>> >> >> (since I'm not using substitution group):
>> >> >>
>> >> >> <derived>...</derived>
>> >> >>
>> >> >> So question: Is there a way to force JAXB return correct xml?
>> >> >>
>> >> >> Thanks in advance
>> >> >> --- Karen
>> >> >> --
>> >> >> View this message in context:
>> >> >>
>> >>
>> http://www.nabble.com/How-to-force-JAXB-to-generate-correct-output-for-derived-classes-tp24573728p24573728.html
>> >> >> Sent from the java.net - jaxb users mailing list archive at
>> >> Nabble.com.
>> >> >>
>> >> >>
>> >> >>
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>> >> >>
>> >> >
>> >> >
>> >>
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>
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