Spring Boot可以将Xml响应主体转换为Java对象，但是不能将Java对象转换为Xml请求主体

Question

When i am trying to send a request with the content-type application/vnd.vmware.vcloud.session+xml;version=5.6 spring boot gives the below exception:

Request processing failed; nested exception is org.springframework.web.client.RestClientException:
Could not write request: no suitable HttpMessageConverter found for request type [com.vmware.vcloud.v1.SessionType] and content type [application/vnd.vmware.vcloud.session+xml;version=5.6]

But when i get a response from the server with the same content-type spring-boot successfully converts the response to SessionType object.

Why spring boot gives the above exception when i am trying send a request?

Answer 1

I found the problem. Jaxb2RootElementHttpMessageConverter can read classes that are annotated with @XmlRootElement or @XmlType .

But it can write only classes that are annotated with @XmlRootElement . Since my classes are not annotated with @XmlRootElement its canWrite method returns false .

@Override
public boolean canRead(Class<?> clazz, MediaType mediaType) {
    return (clazz.isAnnotationPresent(XmlRootElement.class) || clazz.isAnnotationPresent(XmlType.class)) &&
            canRead(mediaType);
}

@Override
public boolean canWrite(Class<?> clazz, MediaType mediaType) {
    return (AnnotationUtils.findAnnotation(clazz, XmlRootElement.class) != null && canWrite(mediaType));
}