Advanced Spring example

public class AuthenticationService {
  private UserManager[] managers;
  public setUserManagers(UserManager[] managers) {
    this.manager = manager;
  }
  public boolean authenticate(String name, String password) {
    for (int i=0; i<managers.size(); i++) {
      if (manager.exists(name)) {
        User user = manager.get(name);
        return user.getPassword().equals(password);
      }
    }
    return false;
  }
}

<beans>
  <bean id="authenticationService" class="example.AuthenticationService">
    <property name="userManagers">
      <list>
        <ref bean="simpleUserManager"/>
        <ref bean="otherUserManager"/>
      </list>
    </property>
  </bean>
  <bean id="simpleUserManager" class="example.SimpleUserManager"/>
  <bean id="otherUserManager" class="example.OtherUserManager"/>
</beans>

ListableBeanFactoryImpl beanFactory = new ListableBeanFactoryImpl();
MutablePropertyValues asPvs = new MutablePropertyValues();
List userManagerList = new ManagedList();
userManagerList.add(new RuntimeBeanReference("simpleUserManager"));
userManagerList.add(new RuntimeBeanReference("otherUserManager"));
asPvs.addPropertyValue("userManagers", userManagerList);
beanFactory.registerBeanDefinition("authenticationService", 
  new RootBeanDefinition(AuthenticationService.class, asPvs, true));
beanFactory.registerBeanDefinition("simpleUserManager", 
  new RootBeanDefinition(SimpleUserManager.class, null, true));
beanFactory.registerBeanDefinition("otherUserManager",
   new RootBeanDefinition(SimpleUserManager.class, null, true));
// same as before
  ...