Spring @Autowired injection doesn't work : DAO is always null

I am working on an EAR with actions handled by Struts and beans by Spring. This EAR includes 3 .jar files, the references of the commons files (DS/US/DAO), and a .war, myProjectWeb.

Code :

The Struts action (in myProjectWeb) :

public class MyAction extends DispatchAction {

    private IMyPreferencesDS myPreferences;

    protected ActionForward executeAction(ActionMapping mapping, ActionForm form, 
        HttpServletRequest request, HttpServletResponse response) throws Exception {
        // newValue is got from my form
        myPreferences.updatePreferences(newValue);
    }
}

The different DSs (in myProject-commons) :

IMyPreferencesDS :

public interface IMyPreferencesDS extends IAbstractDSGeneric<MyDTO> {

    void updatePreferences(String newValue) throws JrafDomainException;

}

MyPreferencesDS :

public class MyPreferencesDS implements IMyPreferencesDS {

    @PersistenceContext(unitName="myPersistenceUnit")
    private EntityManager entityManager;

    @Autowired
    @Qualifier("myPreferencesDAOBean")
    private IMyPreferencesDAO mainDao;

    @Transactional(rollbackFor = JrafDomainRollbackException.class, 
        noRollbackFor = JrafDomainNoRollbackException.class)
    public void updatePreferences(String newValue) throws JrafDomainException {

        mainDao.setNewPreferencesValue(newValue);

    }
}

IMyPreferencesDAO :

public interface IMyPreferencesDAO extends IAbstractDAOGeneric<MyEntity> {

    void setNewPreferencesValue(String newValue) throws JrafDaoException;

}

MyPreferencesDAO :

public class MyPreferencesDAO extends AbstractDAOGenericImpl<MyEntity> implements IMyPreferencesDAO {

    public void setNewPreferencesValue(String newValue) throws JrafDaoException {
        StringBuilder strQuery = new StringBuilder();
        strQuery.append("update MYBASE.MYTABLE ");
        strQuery.append("set");
        strQuery.append(" PREFS=:newValue, ");

        final Query myQuery = getEntityManager().createNativeQuery(strQuery.toString(), MyEntity.class);
        myQuery.setParameter("newValue", newValue);

        try {
            return myQuery.executeUpdate();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Config :

In myProjectWeb :

struts-config :

<form-bean name="MyForm" type="com.my.MyForm"/>
<action input="/media/modificationPopup.jsp" name="MyForm" path="/media/prefModif" 
    scope="request" type="org.springframework.web.struts.DelegatingActionProxy" 
    validate="true"/>

actions-dependencies :

<bean name="/media/prefModif" class="com.my.action.MyAction" scope="singleton">
    <property name="myPreferences" ref="myPreferencesDS" />
</bean> 

application-context-spring :

<beans xmlns="http://ift.tt/GArMu6"
    xmlns:xsi="http://ift.tt/ra1lAU"
    xmlns:tx="http://ift.tt/OGfeU2"
    xmlns:p="http://ift.tt/1jdM0fE"
    xmlns:context="http://ift.tt/GArMu7"
    xmlns:jee="http://ift.tt/OpNaZ5"
    xsi:schemaLocation="http://ift.tt/GArMu6 
    http://ift.tt/GAf8ZW 
    http://ift.tt/OGfeU2 
    http://ift.tt/OGffan 
    http://ift.tt/GArMu7 
    http://ift.tt/1bb5cbf 
    http://ift.tt/OpNaZ5 
    http://ift.tt/OGffai">

    <!-- Enterprise layer's dependencies -->
    <import resource="classpath:ioc/0-ref-commons-enterpriselayer-dependencies.xml" />

    <bean id="springLocator" class="com.afklm.jraf.bootstrap.locator.SpringLocator"></bean>

    <bean id="persistenceUnitManager" class="org.springframework.orm.jpa.persistenceunit.DefaultPersistenceUnitManager">
        <property name="persistenceXmlLocations">
            <list>
                <value>classpath*:META-INF/persistence-web.xml</value>
            </list>
        </property>
    </bean>

    <bean id="myEmf" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="persistenceUnitManager" ref="persistenceUnitManager" />
        <property name="persistenceUnitName" value="myPersistenceUnit" />
    </bean>

    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="myEmf" />
    </bean>

    <tx:annotation-driven transaction-manager="transactionManager" />

    <context:component-scan base-package="com.my.action" /> 
</beans>

0-ref-commons-enterpriselayer-dependencies.xml is contained into the commons jar :

<beans xmlns="http://ift.tt/GArMu6"
   xmlns:xsi="http://ift.tt/ra1lAU"
   xsi:schemaLocation="http://ift.tt/GArMu6 http://ift.tt/1cQAoMK">
    <import resource="1-ref-commons-ds-dependencies.xml"/>
    <import resource="2-ref-commons-us-dependencies.xml"/>
    <import resource="3-ref-commons-daos-dependencies.xml"/>
</beans>

It contains the requested DS and DAO, like this :

In 1-ref-commons-ds-dependencies.xml

<!-- MyPreferencesDS Component -->
<bean id="myPreferencesDS" class="com.commons.ds.MyPreferencesDS" scope="prototype">
</bean>

In 3-ref-commons-daos-dependencies.xml

<!-- MyPreferencesDAO Component -->
<bean id="myPreferencesDAOBean" class="com.commons.daos.MyPreferencesDAO" scope="prototype">
</bean>

All the libs are in my EAR :

And imported into my Web .war :

My EAR's module assembling :

Ok here it is... But when I try to call this line in MyPreferencesDS :

mainDao.setNewPreferencesValue(newValue);

mainDao is always null and I get a NullPointerException... Seems like the @Autowired injection doesn't work there.

Thanks for your help...