jaxb - annotating the addition of an attribute to an element -

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i'm upgrading java object has xml representation in spirit:

<myobjects>     <myobject uid="42" type="someenum">         <name>waldo</name>         <description>yada yada</description>         <myelement>some_string</myelement>         ...     </myobject>     ... </myobjects>

myelement optional - can null in java / omitted in xml.
i'm adding field only relevant if myelement has actual value (and keep compatibility previous xml, it's optional in itself)

i'm trying avoid this:

    <myelement>some_string</myelement>     <myattr>foo</myattr>

and prefer this:

    <myelement myattr="foo">some_string</myelement>

but banging head 2 days on how annotate it.

  • i thought of marking xmltransient , let xmlanyelement catch instead while unmarshalling - seems cause problem when marshalling object java xml.
  • i tried creating xmladapter element - unmarshal method gets inner content ("some_string"). am missing technique?
  • is there way to element string ("<myelement myattr=\"foo\">some_string</myelement>") , process myself?
  • do recommend other approach?

you can use eclipselink jaxb (moxy) @xmlpath extension accomplish this:

import javax.xml.bind.annotation.xmlaccesstype; import javax.xml.bind.annotation.xmlaccessortype; import javax.xml.bind.annotation.xmlattribute; import javax.xml.bind.annotation.xmlrootelement;  import org.eclipse.persistence.oxm.annotations.xmlpath;  @xmlrootelement @xmlaccessortype(xmlaccesstype.field) public class myobject {      @xmlattribute     private int uid;      @xmlattribute     private string type;      private string name;      private string description;      private string myelement;      @xmlpath("myelement/@myattr")     private string myattr;  }

this class interact following xml:

<myobject uid="42" type="someenum">     <name>waldo</name>     <description>yada yada</description>     <myelement myattr="foo">some_string</myelement> </myobject>

using following demo code:

import java.io.file;  import javax.xml.bind.jaxbcontext; import javax.xml.bind.marshaller; import javax.xml.bind.unmarshaller;  public class demo {      public static void main(string[] args) throws exception {         jaxbcontext jc = jaxbcontext.newinstance(myobject.class);          file file = new file("input.xml");         unmarshaller unmarshaller = jc.createunmarshaller();         myobject myobject = (myobject) unmarshaller.unmarshal(file);          marshaller marshaller = jc.createmarshaller();         marshaller.setproperty(marshaller.jaxb_formatted_output, true);         marshaller.marshal(myobject, system.out);     }  }

to specify moxy jaxb implementation need include file called jaxb.properties in same package model classes following entry:

javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.jaxbcontextfactory

for more information on moxy's xpath based mapping see:


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