Jersey 2.26 Cliente Post JSON, Sempre Retorna Bad Request

@XmlRootElement(name = "category")
@XmlAccessorType(XmlAccessType.FIELD)
public class Category implements Serializable {

	private static final long serialVersionUID = -7270841066593156958L;

	private String code;
	private String name;
 ....
}

	
               Client c = ClientBuilder.newClient();
		c.register(LoggingFilter.class);

		Builder builder = c.target("http://api.skyhub.com.br").path("/categories").request(MediaType.APPLICATION_JSON);

		builder.accept(MediaType.APPLICATION_JSON);

		usuarioB2W.autenticar(builder);

		Response response = builder.post(Entity.entity(category, MediaType.APPLICATION_JSON));