Jackson が遅延フェッチされた Hibernate オブジェクトをシリアル化しないようにするにはどうすればよいですか?

@Configuration
@EnableWebMvc
public class MyConfigClass extends WebMvcConfigurerAdapter{

    public MappingJackson2HttpMessageConverter jacksonMessageConverter(){
        MappingJackson2HttpMessageConverter messageConverter = new MappingJackson2HttpMessageConverter();
        ObjectMapper mapper = new ObjectMapper();
        mapper.registerModule(new Hibernate4Module());
        messageConverter.setObjectMapper(mapper);
        return messageConverter;
    }

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        converters.add(jacksonMessageConverter());
        super.configureMessageConverters(converters);
    }
}

public @ResponseBody User getUser(@PathVariable String username) {
        
    User user = userService.getUser(username);
        
    return user;
        
}

<bean class="com.pastelstudios.json.HibernateAwareObjectMapper">

<mvc:message-converters>
    <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
        <property name="objectMapper" ref="hibernateAwareObjectMapper" />
    </bean>
</mvc:message-converters>