Exception in thread "main" org.apache.cxf.interceptor.Fault: .No message body writer found for class : class com.company.datatype.normal.MyObject.
    at org.apache.cxf.jaxrs.client.ClientProxyImpl$BodyWriter.handleMessage(ClientProxyImpl.java:523)
    at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:263)
    at org.apache.cxf.jaxrs.client.ClientProxyImpl.doChainedInvocation(ClientProxyImpl.java:438)
    at org.apache.cxf.jaxrs.client.ClientProxyImpl.invoke(ClientProxyImpl.java:177)
    at $Proxy13.execute(Unknown Source)
    at com.company.JaxTestClient.main(JaxTestClient.java:26)
Caused by: org.apache.cxf.jaxrs.client.ClientWebApplicationException: .No message body writer found for class : class com.company.datatype.normal.MyObject.
    at org.apache.cxf.jaxrs.client.AbstractClient.reportMessageHandlerProblem(AbstractClient.java:491)
    at org.apache.cxf.jaxrs.client.AbstractClient.writeBody(AbstractClient.java:401)
    at org.apache.cxf.jaxrs.client.ClientProxyImpl$BodyWriter.handleMessage(ClientProxyImpl.java:515)
    ... 5 more

JaxExample jaxExample = JAXRSClientFactory.create( "http://localhost:8111/", JaxExample.class );
MyObject before = ...
MyObject after = jaxExample.execute( before );

@POST
@Path( "execute" )
@Produces( "application/json" )
MyObject execute( MyObject myObject );

//TestApi parts
@GET
@Path ( "test" )
@Produces ( "application/json" )
public Demo getDemo () {
    Demo d = new Demo ();
    d.id = 1;
    d.name = "test";
    return d;
}

//client config for a TestApi interface
List providers = new ArrayList ();
JSONProvider jsonProvider = new JSONProvider ();
Map<String, String> map = new HashMap<String, String> ();
map.put ( "http://www.myserviceapi.com", "myapi" );
jsonProvider.setNamespaceMap ( map );
providers.add ( jsonProvider );
TestApi proxy = JAXRSClientFactory.create ( url, TestApi.class,
    providers, true );

Demo d = proxy.getDemo ();
if ( d != null ) {
    System.out.println ( d.id + ":" + d.name );
}

//the Demo class
@XmlRootElement ( name = "demo", namespace = "http://www.myserviceapi.com" )
@XmlType ( name = "demo", namespace = "http://www.myserviceapi.com",
    propOrder = { "name", "id" } )
@XmlAccessorType ( XmlAccessType.FIELD )
public class Demo {

    public String name;
    public int id;
}

@Produces ( "application/json" )
@Consumes ( "application/json" )
@Provider
public class XstreamJsonProvider implements MessageBodyReader<Object>,
    MessageBodyWriter<Object> {

@Override
public boolean isWriteable ( Class<?> type, Type genericType,
    Annotation[] annotations, MediaType mediaType ) {
    return MediaType.APPLICATION_JSON_TYPE.equals ( mediaType )
        && type.equals ( Demo.class );
}

@Override
public long getSize ( Object t, Class<?> type, Type genericType,
    Annotation[] annotations, MediaType mediaType ) {
    // I'm being lazy - should compute the actual size
    return -1;
}

@Override
public void writeTo ( Object t, Class<?> type, Type genericType,
    Annotation[] annotations, MediaType mediaType,
    MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream )
    throws IOException, WebApplicationException {
    // deal with thread safe use of xstream, etc.
    XStream xstream = new XStream ( new JettisonMappedXmlDriver () );
    xstream.setMode ( XStream.NO_REFERENCES );
    // add safer encoding, error handling, etc.
    xstream.toXML ( t, entityStream );
}

@Override
public boolean isReadable ( Class<?> type, Type genericType,
    Annotation[] annotations, MediaType mediaType ) {
    return MediaType.APPLICATION_JSON_TYPE.equals ( mediaType )
        && type.equals ( Demo.class );
}

@Override
public Object readFrom ( Class<Object> type, Type genericType,
    Annotation[] annotations, MediaType mediaType,
    MultivaluedMap<String, String> httpHeaders, InputStream entityStream )
    throws IOException, WebApplicationException {
    // add error handling, etc.
    XStream xstream = new XStream ( new JettisonMappedXmlDriver () );
    return xstream.fromXML ( entityStream );
}
}

//now your client just needs this
List providers = new ArrayList ();
XstreamJsonProvider jsonProvider = new XstreamJsonProvider ();
providers.add ( jsonProvider );
TestApi proxy = JAXRSClientFactory.create ( url, TestApi.class,
    providers, true );

Demo d = proxy.getDemo ();
if ( d != null ) {
    System.out.println ( d.id + ":" + d.name );
}

<?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:jaxrs="http://cxf.apache.org/jaxrs"
xmlns:cxf="http://cxf.apache.org/core"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://cxf.apache.org/jaxrs http://cxf.apache.org/schemas/jaxrs.xsd
    http://cxf.apache.org/core http://cxf.apache.org/schemas/core.xsd">

<import resource="classpath:META-INF/cxf/cxf.xml" />

<jaxrs:server id="TestApi">
    <jaxrs:serviceBeans>
        <ref bean="testApi" />
    </jaxrs:serviceBeans>
    <jaxrs:providers>
        <bean id="xstreamJsonProvider" class="webtests.rest.XstreamJsonProvider" />
    </jaxrs:providers>
</jaxrs:server>

<bean id="testApi" class="webtests.rest.TestApi">
</bean>

</beans>

return MediaType.APPLICATION_JSON_TYPE.getType ().equals ( mediaType.getType () )
    && MediaType.APPLICATION_JSON_TYPE.getSubtype ().equals ( mediaType.getSubtype () )
    && type.equals ( Demo.class );

org.apache.cxf.jaxrs.servlet.CXFNonSpringJaxrsServlet

jaxrs.serviceClasses
jaxrs.providers

<servlet>
    <servlet-name>cxfservlet</servlet-name>
    <servlet-class>org.apache.cxf.jaxrs.servlet.CXFNonSpringJaxrsServlet</servlet-class>
    <init-param>
        <param-name>jaxrs.serviceClasses</param-name>
        <param-value>webtests.rest.TestApi</param-value>
    </init-param>
    <init-param>
        <param-name>jaxrs.providers</param-name>
        <param-value>webtests.rest.XstreamJsonProvider</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

<init-param>
  <param-name>jaxrs.providers</param-name>
  <param-value>
      org.apache.cxf.jaxrs.provider.JSONProvider
      (writeXsiType=false)
  </param-value>
</init-param>

<jaxrs:client id="serviceId"
    serviceClass="classname"
    address="">
    <jaxrs:providers>
        <bean class="org.codehaus.jackson.jaxrs.JacksonJsonProvider">
            <property name="mapper" ref="jacksonMapper" />
        </bean>
    </jaxrs:providers>
</jaxrs:client>

<bean id="jacksonMapper" class="org.codehaus.jackson.map.ObjectMapper">
</bean>

<dependency>
        <groupId>org.apache.cxf</groupId>
        <artifactId>cxf-rt-rs-extension-providers</artifactId>
        <version>3.0.2</version>
    </dependency>

    <dependency>
        <groupId>org.codehaus.jackson</groupId>
        <artifactId>jackson-jaxrs</artifactId>
        <version>1.9.0</version>
    </dependency>

<jaxrs:providers>
        <bean class="org.codehaus.jackson.jaxrs.JacksonJaxbJsonProvider" />
    </jaxrs:providers>