Unmarshall Exception error in using Jersey Java to call rest Apis

Hi,
I am using Jersey to call the REST API in rails.
I am having two tables as

blogpost(id,title,desc)
comment(id,commentdata)

I am trying to write a method in java to post a comment and my url is

/api/blogs/comment.xml?title=&comment=

THe method i am using is

public BlogBean postComment(String title, String comment) {
System.out.println(title+""+comment);
// Create a multivalued map to store the parameters to be send in
the REST call
MultivaluedMap<String, String> newBlogParam = new
MultivaluedMapImpl();

   newBlogParam.add("title", "testingapiblogposttitle");
   newBlogParam.add("comment", "aaaaaaaaaaaaaa");

   BlogBean blogBean = null;



   try {

       blogBean =

webResource.path(ConfigurationUtil.POST_COMMENT).header(ConfigurationUtil.AUTHENTICATION_HEADER,
authentication)
.type(MediaType.APPLICATION_FORM_URLENCODED_TYPE).accept(MediaType.APPLICATION_XML_TYPE).post(BlogBean.class,
newBlogParam);

   } catch (UniformInterfaceException uie) {
          if (uie.getResponse().getStatus() == 401) {
              System.out.println("Can not authenticate user

"+ConfigurationUtil.userName +
“. Please check your username/password and try
again.” );
} else {

            System.out.println("Error when trying to talk to app. "
  •               "HTTP status code
    

"+uie.getResponse().getStatus()+“returned. Finishing.”);

          }
          return null;
      } catch (ClientHandlerException che) {
        System.out.println("Error when trying to talk toapp. Network

issues? " +
"Please check the following message and try again later:
"+che.getMessage());
return null;
}

   return blogBean;

}
where ConfigurationUtil.POST_COMMENT= “api/blogs/comment.xml”

xmlrootelement i am using is “blogpost”

When i run this one i am getting error as

Exception in thread “main” javax.ws.rs.WebApplicationException:
javax.xml.bind.UnmarshalException: unexpected element (uri:"",
local:“message”). Expected elements are <{}blogpost>


Caused by: javax.xml.bind.UnmarshalException: unexpected element
(uri:"", local:“message”). Expected elements are <{}blogpost>

Why i am getting this error . How to avoid this??
Pls give suggestions