Spring Jaxb2XmlEncoder can not encode JAXBElement

Affects: \

---

Spring boot: 3.3.0

I'm trying to use WebClient to send XML date using Jaxb.

I have generate my classes using jaxb2-maven-plugin it seems that this plugin don't add @XmlRootElement on classes.

Without this annotation the Jaxb marshaler don't want to serialize my data with this error impossible to serialize type “xxxxxx” as an element, as it has no @XmlRootElement annotation.

The other way to serialize data is to use JAXBElement, but the JAXBElement is not supported by Jaxb2XmlEncoder, the can encode method say:

if (super.canEncode(elementType, mimeType)) {
    Class<?> outputClass = elementType.toClass();
    return (outputClass.isAnnotationPresent(XmlRootElement.class) ||
            outputClass.isAnnotationPresent(XmlType.class));
}
else {
    return false;
}

to work properly, I have create a customer encoder with this code:

public class CustomXmlEncoder extends Jaxb2XmlEncoder {

    @Override
    public boolean canEncode(ResolvableType elementType, MimeType mimeType) {
        if (elementType.isAssignableFrom(JAXBElement.class)) {
            return true;
        }
        return super.canEncode(elementType, mimeType);
    }
}

I don't know is there is a reason to not support JAXBElement while this issue https://github.com/spring-projects/spring-framework/issues/30552 provides support on serialization process.

Thanks for your help

Comment From: deblockt

A project to reproduce the issue has been created here: spring-jaxb-error-main.zip

Comment From: sbrannen

Hi @deblockt,

Thanks for raising the issue.

Please note, however that there is no need to create an issue and subsequently a PR for that issue.

In light of that, I am closing this issue as:

• superseded by PR #32977