XmlElementRef ignored if inside XmlElementWrapper #40

gkresic · 2015-04-22T07:20:51Z

It seams that JaxbAnnotationIntrospector is ignoring @XmlElementRef annotations if they are coupled with @XmlElementWrapper. For example, take this two simple beans:

@XmlRootElement
@XmlAccessorType(XmlAccessType.NONE)
public class Foo {

    @XmlElement
    public int getCount() { return count; }
    public void setCount(int count) { this.count = count; }

    @XmlElementWrapper(name="data")
    @XmlElementRef
    public List<Bar> getBars() { return bars; }
    public void setBars(List<Bar> bars) { this.bars = bars; }

    private int count;
    private List<Bar> bars;

}

@XmlRootElement
@XmlAccessorType(XmlAccessType.NONE)
public class Bar {

    @XmlElement
    public String getFirst() { return first; }
    public void setFirst(String first) { this.first = first; }

    @XmlElement
    public String getSecond() { return second; }
    public void setSecond(String second) { this.second = second; }

    private String first;
    private String second;

}

and this data:

Foo foo = new Foo();
foo.setCount(7);
    List<Bar> bars = new ArrayList<Bar>();
        Bar one = new Bar();
        one.setFirst("One");
        one.setSecond("Only");
    bars.add(one);
        Bar two = new Bar();
        two.setFirst("Two");
        two.setSecond("Trees");
    bars.add(two);
foo.setBars(bars);

When serialized to XML (using JAXB.marshal(...)) output is fine:

<foo>
    <data>
        <bar>
            <first>One</first>
            <second>Only</second>
        </bar>
        <bar>
            <first>Two</first>
            <second>Trees</second>
        </bar>
    </data>
    <count>7</count>
</foo>

However, when serializing to JSON (using ObjectMapper.writeValue(...)) whole
"data" part is missing and output is just:

{
  "count" : 7
}

I've found out, that I can get correct JSON output if I use @XmlElement
instead of @XmlElementRef on Foo.bars:

@XmlRootElement
@XmlAccessorType(XmlAccessType.NONE)
public class Foo {

    @XmlElement
    public int getCount() { return count; }
    public void setCount(int count) { this.count = count; }

    @XmlElementWrapper(name="data")
    @XmlElement
    public List<Bar> getBars() { return bars; }
    public void setBars(List<Bar> bars) { this.bars = bars; }

    private int count;
    private List<Bar> bars;

}

Output:

{
  "count" : 7,
  "data" : [ {
    "first" : "One",
    "second" : "Only"
  }, {
    "first" : "Two",
    "second" : "Trees"
  } ]
}

Unfortunatelly, changing @XmlElementRef to @XmlElement is not viable
solution in complex project.

Note: in all above examples MapperFeature.USE_WRAPPER_NAME_AS_PROPERTY_NAME
was set to true.

The text was updated successfully, but these errors were encountered:

cowtowncoder added this to the 2.5.3 milestone Apr 23, 2015

cowtowncoder closed this as completed in a76a830 Apr 23, 2015

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XmlElementRef ignored if inside XmlElementWrapper #40

XmlElementRef ignored if inside XmlElementWrapper #40

gkresic commented Apr 22, 2015

XmlElementRef ignored if inside XmlElementWrapper #40

XmlElementRef ignored if inside XmlElementWrapper #40

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gkresic commented Apr 22, 2015