@Entity
class User {
...
}

@Entity
class Product implement AuditLog {
   public User getCreatedUser() {
      ...
   }
}

class AuditLogInterceptor extends EmptyInterceptor {
   public boolean onSave(Object entity, Serializable id, Object[] state, String[] propertyNames,
      Type[] types) {
      User user = userDao.getActiveUser();
      Date now = DateHelper.getCurrentDateTime();
      myentity.setCreatedBy(user);
      myentity.setCreatedDate(now);
      ...
   }
}

ApplicationContext.xml

<bean class="org.springframework.orm.hibernate4.LocalSessionFactoryBean" id="sessionFactory"
    destroy-method="destroy">
    <property name="dataSource" ref="datasource" />
    <property name="packagesToScan">
      <list>
        <value>org.dolphin.entity</value>
      </list>
    </property>
    <property name="hibernateProperties">
      <props>
        <prop key="hibernate.dialect">${hibernate.dialect}</prop>
        <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
      </props>
    </property>
    <property name="entityInterceptor" ref="auditLogInterceptor" />
  </bean>