constructor in my controller is called twice, the setter only once

[olze oli]

i have a controller which has a dao (lectureDao) in it

applicationContext:

   <bean id="viewController" class="Controller.ViewController" >
        <property name="lectureDao" ref="lectureDao" />
    </bean>

    <bean id="lectureDao" class="DaoImpl.LectureDaoImpl" >
        <property name="entityManagerFactory" ref="entityManagerFactory"/>
    </bean>  

first, the constructor ViewController() is called, then setLectureDao and then again the ViewController() constructor and i have no idea why this happens.
i tried it with lazy loading but that didnt change anything - and because of the second constructor call the lectureDao is always null when i try to access it.
it is set correctly when the constructor has been called once.

its a liferay portlet and i use the org.springframework.web.portlet.DispatcherPortlet (in portlet.xml) as my dispatcher
can someone give me any hint whats going on? how i could fix this?

[olze oli]

i found the problem
in my MontyBrogan-portlet.xml i defined the bean with:
<bean id="viewController" class="Controller.ViewController"></bean>

so first applicationContext called the setter and then the MontyBrogan-portlet called the constructor which set lectureDao to null