Spring 4 Controller not converting JSON to Java class

I'm tryng to convert JSON into a java class using Spring. When I execute the code I get 400 bad request. If I replace User java object (@RequestBody final **User** user) with generic java Oject (@RequestBody final **Object** user), I get the json string as parameter.

Here's my code.

Javascript:

register : function(usr,pwd) {
    var user = {username : usr, password: pwd}
    return $http({
        method: 'POST',
        url: '/SpringSecurityRememberMeAnnotationExample/newuser',
        contentType: "application/json",
        data:user
    });
    /*
    return $http.post('/SpringSecurityRememberMeAnnotationExample/newuser', user).then(function(response) {
        return response.data;
    });
    */
},

Controller:

@Controller
@Scope("request")
public class HomeController {

    @RequestMapping(value = "/newuser", method = RequestMethod.POST)
    @ResponseBody public User SaveUser(@RequestBody final User user){
        System.out.println("username: ");// + user.username);
        System.out.println("password: ");// + user.password);
        return null;
    }

spring-mvc.xml

<mvc:annotation-driven/>
<mvc:default-servlet-handler/>

<!-- Login Interceptor -->
<mvc:interceptors>
    <mvc:interceptor>
        <mvc:mapping path="/**"/>
        <bean class="com.websystique.springsecurity.interceptor.LoginInterceptor"/>
    </mvc:interceptor>
    <!-- workaround to fix IE8 problem -->
    <bean id="webContentInterceptor"
          class="org.springframework.web.servlet.mvc.WebContentInterceptor">
        <property name="cacheSeconds" value="0"/>
        <property name="useExpiresHeader" value="true"/>
        <property name="useCacheControlHeader" value="true"/>
        <property name="useCacheControlNoStore" value="true"/>
    </bean>
</mvc:interceptors>

<!-- i18n -->
<bean id="messageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
    <property name="useCodeAsDefaultMessage" value="true"/>
    <property name="basename" value="WEB-INF/i18n"/>
    <property name="defaultEncoding" value="UTF-8"/>
    <property name="fileEncodings" value="UTF-8" />
</bean>
<bean id="localeResolver" class="org.springframework.web.servlet.i18n.FixedLocaleResolver">
    <property name="defaultLocale" value="it"/>
    <property name="useCodeAsDefaultMessage" value="true"/>
</bean>

<!-- Exception handler -->
<bean id="exceptionResolver"
      class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
  <property name="exceptionMappings">
    <props>
      <prop key="LoginRequiredException">          
        public/loginRequired
      </prop>
      <prop key="ResourceNotFoundException">          
        public/notFound
      </prop>
    </props>
  </property>
  <property name="defaultErrorView" value="rescues/general" />
</bean>

<!-- View Handler -->
<bean id="jspViewResolver"
    class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="viewClass"
        value="org.springframework.web.servlet.view.JstlView" />
    <property name="prefix" value="/WEB-INF/views/" />
    <property name="suffix" value=".jsp" />
    <property name="order" value="0" />
</bean>
<bean id="jacksonMessageConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter" />
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
    <property name="messageConverters">
        <list>
            <ref bean="jacksonMessageConverter"/>
        </list>
    </property>
</bean>

Thank you!

Adding POM.XML config, json part

<!-- JSon -->
        <dependency>
            <groupId>com.fasterxml.jackson.jaxrs</groupId>
            <artifactId>jackson-jaxrs-json-provider</artifactId>
            <version>2.6.4</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.6.4</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.6.4</version>
        </dependency>
        <dependency>
            <groupId>org.codehaus.jackson</groupId>
            <artifactId>jackson-mapper-asl</artifactId>
            <version>1.9.13</version>
        </dependency>