package com.rdbs.impl;
...
@Repository("domainDao")
public class DomainDaoImpl implements DomainDao {
    private static final Logger LOG = LoggerFactory.getLogger(DomainDaoImpl.class);

    // Hibernate-JPA entity manager
    @PersistenceContext
    private EntityManager entityManager;

    @Transactional(readOnly=true)
    @Override
    public Persons findPersonsById(long id) {
        LOG.info("[RDBS] findPersonsById: {}", id);
        TypedQuery<Persons> query = entityManager.createNamedQuery("findPersonsById", Persons.class);
        query.setParameter("id", id);

        return query.getSingleResult();
    }
    ...
}

...
<context:annotation-config/>
<bean id="domainDao" class="com.rdbs.impl.DomainDaoImpl"/>
...

package com.app.worker;
...
public class Extractor {
    @Resource(name = "domainDao")
    private DomainDao domainDao;
    ...

package com.app.worker;
...
public class Extractor {
    @Autowired
    @Qualifier("domainDao")
    private DomainDao domainDao;

    public Extractor() {
        GenericXmlApplicationContext ctx = new GenericXmlApplicationContext();
        ctx.load("classpath:META-INF/worker-context.xml");
        ctx.refresh();

        domainDao = ctx.getBean("domainDao", DomainDao.class);
    }
...
}

    <!-- Context: scanning -->
    <context:component-scan base-package="com.app.worker"/>
    <context:annotation-config/>

    <import resource="rdbs-context.xml"/>

    <!-- Context: scanning -->
    <context:component-scan base-package="com.app.worker"/>
    <context:annotation-config/>

    <import resource="rdbs-context.xml"/>

    <bean id="domainDao" class="com.rdbc.impl.DomainDaoImpl"/>

    <bean id="extractor" class="com.app.Extractor"/>

package com.rdbs.impl;

@Service("domainDao")
@Repository
@Transactional
public class DomainDaoImpl implements DomainDao {
    private static final Logger LOG = LoggerFactory.getLogger(DomainDaoImpl.class);

    // Hibernate-JPA entity manager
    @PersistenceContext
    private EntityManager entityManager;

    @Transactional(readOnly=true)
    @Override
    public Persons findPersonsById(long id) {
        LOG.info("[RDBS] findPersonsById: {}", id);
        TypedQuery<Persons> query = entityManager.createNamedQuery("findPersonsById", Persons.class);
        query.setParameter("id", id);

        return query.getSingleResult();
    }

    // Другие методы
    ...
}

package com.rdbs.dao;

public interface DomainDao {
    Persons findPersonsById(long id);
    ...
}

package com.rdbs.entity;

@Entity
@Table(name="persons")
@Access(AccessType.FIELD)
@NamedQueries({
        @NamedQuery(name="findPersonsById", query="SELECT p FROM Persons p WHERE p.id = :id"),
        ...
})
public class Persons implements Serializable {
    @Id
    @GeneratedValue
    private Long id;
    ...

    // Сеттеры, геттеры
}

@Service("extractor")
public class Extractor {
    @Autowired
    @Qualifier("domainDao")
    private DomainDao domainDao;
    ...
}

    <!-- Context: scanning -->
    <context:component-scan base-package="..."/>
    <context:annotation-config/>

    <import resource="rdbs-context.xml"/>

    <bean id="domainDao" class="com.rdbs.impl.DomainDaoImpl"/>

public class Scanner {
    private Extractor extractor;
    private DomainDao domainDao;

    public Scanner() {
        GenericXmlApplicationContext ctx = new GenericXmlApplicationContext();
        ctx.load("classpath:META-INF/worker-context.xml");
        ctx.refresh();

        // Извлекаем и внедряем
        extractor = ctx.getBean("extractor", Extractor.class);
        domainDao = extractor.getDomainDao();

        // Проверяем
        System.out.println(extractor);
        System.out.println(domainDao);
    }
}