Could not write request: no suitable HttpMessageConverter found for request type

[benam.badshah]

I get the below exception when trying to call a rest service using RestTemplate. I am using MarshallingHttpMessageConverter with Jaxb2Marshaller

Exception in thread "main" org.springframework.web.client.RestClientException: Could not write request: no suitable HttpMessageConverter found for request type [com.mycompany.server.jaxb.device.ModelType] and content type [application/xml]
	at org.springframework.web.client.RestTemplate$HttpEntityRequestCallback.doWithRequest(RestTemplate.java:597)
	at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:436)
	at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:415)
	at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:391)
	at com.mycompany.client.rest.DeviceClient.createModel(DeviceClient.java:36)
	at com.mycompany.client.Main.main(Main.java:13)

My client code is below..

                ModelType model = getModel(modelNum, devType, devSubtype);
		URI url = null;
		url = new URI("http://localhost:8080/rest/model");
		HttpHeaders	headers = getHeaders();
		HttpEntity<ModelType> reqEntity = new HttpEntity<ModelType>(model, headers);
		ResponseEntity<String> respEntity = restTemplate.exchange(url, HttpMethod.PUT, reqEntity, String.class);
		respEntity.getBody();

And I am pasting my application.xml below..

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:p="http://www.springframework.org/schema/p"
	xmlns:util="http://www.springframework.org/schema/util"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd
		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsd">


	<bean name="deviceClient" class="com.mycompany.client.rest.DeviceClient">
		<property name="restTemplate" ref="restTemplate"/>
	
	</bean>
	
	<bean id="restTemplate" class="org.springframework.web.client.RestTemplate">
 
        <property name="messageConverters">
            <list>
            	<bean class="org.springframework.http.converter.StringHttpMessageConverter"/>
                <bean class="org.springframework.http.converter.xml.MarshallingHttpMessageConverter">
                    <property name="marshaller" ref="jaxbMarshaller"/>
                    <property name="unmarshaller" ref="jaxbMarshaller"/>
                </bean>
                <bean class="org.springframework.http.converter.FormHttpMessageConverter"/>
            </list>
        </property>
    </bean>
 
    <bean id="jaxbMarshaller" class="org.springframework.oxm.jaxb.Jaxb2Marshaller">
    	<property name="classesToBeBound">
    		<list>
    			<value>com.mycompany.server.jaxb.device.ModelType</value>
    		</list>
    	</property>
    </bean>
</beans>

If my change my cilent code to use HttpEntity<String> instead of HttpEntity<ModelType> everything works fine and I am able to get a response back.

ModelType model = getModel(modelNum, devType, devSubtype);
		URI url = null;
		url = new URI("http://localhost:8080/rest/model");
		HttpHeaders	headers = getHeaders();
		HttpEntity<String> reqEntity = new HttpEntity<String>("hello world", headers);
		ResponseEntity<String> respEntity = restTemplate.exchange(url, HttpMethod.PUT, reqEntity, String.class);
		respEntity.getBody();

The issue seems to be supports method in Jaxb2Marshaller. The 'unmarshaller' in the code below is of type Jaxb2Marshaller and the line this.unmarshaller.supports(clazz) returns false. I do not have code for the Jaxb2Marshaller and could not dig in any further.

@Override
	public boolean supports(Class<?> clazz) {
		return this.unmarshaller.supports(clazz);
	}

I will try to find the source code and investigate further. But if anybody knows the solution, any answer is greatly appreciated.

Thanks,
Benam

[benam.badshah]

I found the solution after downloading the source code spring-oxm and stepping through. Its a JAXB issue. The JAXB compiler did not add the @XMLRootElement annotation to the ModelType class that it generated. I added it manually for now (though not ideal) and progressed a bit further. I think there are more JAXB issues that need to be fixed.