Wsdl2Java generates class with protected List<JAXBElement<?>> content

Question

We are trying to integrate with the service published in https://www2.agenciatributaria.gob.es/static_files/common/internet/dep/taiif/wsdl/ixgd/DpiNtnlDeclaration_v1.0.wsdl

We have configured our gradle-based springboot application using the plugin 'com.github.bjornvester.wsdl2java'

When the tools generates the classes for the AddresType from

    <xsd:complexType name="Address_Type">
        <xsd:sequence>
            <xsd:element name="CountryCode">
                <xsd:annotation>
                    <xsd:documentation>This data element provides the country code associated with the entity’s (or person’s) address.</xsd:documentation>
                </xsd:annotation>
                <xsd:simpleType>
                    <xsd:restriction base="iso:CountryCode_Type">
                        <xsd:minLength value="1"/>
                        <xsd:maxLength value="2"/>
                    </xsd:restriction>
                </xsd:simpleType>
            </xsd:element>
            <xsd:choice>
                <xsd:element name="AddressFree" type="stf:StringMin1Max4000_Type">
                    
                </xsd:element>
                <xsd:sequence>
                    <xsd:element name="AddressFix" type="dpi:AddressFix_Type"/>
                    <xsd:element name="AddressFree" type="stf:StringMin1Max4000_Type" minOccurs="0">
                    </xsd:element>
                </xsd:sequence>
            </xsd:choice>
        </xsd:sequence>
        <xsd:attribute name="legalAddressType" type="stf:OECDLegalAddressType_EnumType" use="optional">

        </xsd:attribute>
    </xsd:complexType>

the output is:

...
    @XmlElementRefs({
        @XmlElementRef(name = "CountryCode", namespace = "urn:oecd:ties:dpi:v1", type = JAXBElement.class, required = false),
        @XmlElementRef(name = "AddressFree", namespace = "urn:oecd:ties:dpi:v1", type = JAXBElement.class, required = false),
        @XmlElementRef(name = "AddressFix", namespace = "urn:oecd:ties:dpi:v1", type = JAXBElement.class, required = false)
    })
    protected List<JAXBElement<?>> content;
...

And when we try to do the java to xml, the application raises an exception saying:

Caused by: com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `jakarta.xml.bind.JAXBElement` (no Creators, like default constructor, exist): cannot deserialize from Object value (no delegate- or property-based Creator)

Is there a way to solve it?

We have tried with xjb bindings, trying to rename a property or setting our own implementation, but looks like the xpath (it is a wsdl, that imports an xsd that also imports another xsd) is not being picked up.

We are expecting a class that offers a list in the way of getCountryCodeOrAddressFreeOrAddressFix()

---

Edit:

Ok, we found out that there were also methods on the objectFactory to create the different elements that are part of the 'content' list. And we ended up using them.

Answer 1

Ok, so we ended up using a bindings.xjb and replace the generated class with one of our own.

<jaxb:bindings version="3.0"
               xmlns:jaxb="https://jakarta.ee/xml/ns/jaxb"
               xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <jaxb:bindings
            schemaLocation="https://www2.agenciatributaria.gob.es/static_files/common/internet/dep/taiif/xsd/ixgd/DPIXML_v1.0.xsd"
            node="xsd:complexType[@name='Address_Type']">
        <jaxb:class ref="com.package.name.to.our.implementation.AddressType"/>
    </jaxb:bindings>

</jaxb:bindings>

and in the build.gradle

wsdl2java {
    cxfVersion.set("4.0.3")
    wsdlDir.set(layout.projectDirectory.dir("src/main/resources/wsdl"))
    generatedSourceDir.set(layout.buildDirectory.dir("aeat/generated"))
    bindingFile.set(layout.projectDirectory.file("src/main/resources/wsdl/binding.xjb"))
}

We did try using the simplify plugin suggested by Laurent, but we were getting errors like "compiler was unable to honor this simplify:as-element-property customization"