Jackson XML Annotations: String element with attribute

Question

I can't seem to find a way to make a Pojo Using the jackson-xml annotations that would generate xml like the following:

<Root>
    <Element1 ns="xxx">
        <Element2 ns="yyy">A String</Element2>
    </Element1>
</Root>

The closest I can seem to come is the following:

Root POJO :

public class Root {
    @JacksonXmlProperty(localName = "Element1")
    private Element1 element1;

    public String getElement1() {
        return element1;
    }

    public void setElement1(String element1) {
        this.element1 = element1;
    }
}

Element1 POJO :

public class Element1 {
    @JacksonXmlProperty(isAttribute = true)
    private String ns = "xxx";
    @JacksonXmlProperty(localName = "Element2")
    private Element2 element2;

    public String getElement2() {
        return element2;
    }

    public void setElement2(String element2) {
        this.element2 = element2;
    }
}

Element2 POJO :

public class Element2 {
    @JacksonXmlProperty(isAttribute = true)
    private String ns = "yyy";
    private String value;

    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }
}

But this returns back the following:

<Root>
    <Element1 ns="xxx">
        <Element2 ns="yyy"><value>A String</value></Element2>
    </Element1>
</Root>

The element tags around "A String" I do not want to display.

Answer 1

You should use JacksonXmlText annotation for value field.

public class Element2 
{
    @JacksonXmlProperty(isAttribute = true)
    private String ns = "yyy";
    @JacksonXmlText
    private String value;

    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }
}  

then XML will looks like

<Root>
    <Element1 ns="xxx">
        <Element2 ns="yyy">A String</Element2>
    </Element1>
</Root>

Answer 2

For Kotlin, you need to use @field annotation use-site targets:

data class Element2(
        @field:JacksonXmlProperty(isAttribute = true)
        val ns: String = "yyy",
        @field:JacksonXmlText
        val value: String? = null
)

If you don't like defining initial values for ns and value properties by yourself then use Kotlin no-args plugin , which generates a default constructor instead.

Answer 3

Unfortunately I'm unable to comment but I did want to make a note about flyingAssistant's answer in case anyone else ran into the same issue I was having. You can't add @JacksonXmlText to a constructor property. This feature may be added in build 2.13 based off of this issue reported in the GitHub repo. So for now you'll have to do this

data class Element2(@field:JacksonXmlProperty(isAttribute = true) val ns: String = "yyy") {
    @field:JacksonXmlText
    val value: String? = null
}