Custom Provider not being invoked

[semecxf]

I am trying to send javax.security.auth.Subject as json, but I am getting
JAXRSOutInterceptor            WARN  No message body writer has been found
for response class Subject.
I added a provider so that I could create my json but my provider is not
being called?

I follow sample code in this doc
(http://cxf.apache.org/docs/jax-rs-basics.html) to implement my provider.
Any idea?

Here is my spring xml sample

 <bean id="isProvider" class="com.SubjectProvider"/>
    <bean id="jsonProvider"
class="org.apache.cxf.jaxrs.provider.JSONProvider"> 
        <property name="ignoreNamespaces" value="true" /> 
    </bean> 
    
     <jaxrs:server address="/subjectResource">
                <jaxrs:serviceBeans>
                        <ref bean="subject" />
                </jaxrs:serviceBeans>
                <jaxrs:providers>
         <ref bean="isProvider" />
          <ref bean="jsonProvider" /> 
    </jaxrs:providers>
    
        </jaxrs:server>

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