Nullpointer exception with IOC inheritance

[vator]

I'm getting a nullpointer exception in the MenuController class when when the property rightFrame calls a function.

MenuController extends AdminController which again extends BaseController and the property rightFrame is set in BaseController and overridden in AdminController through bean injection inapplicationContext.xml.

Why am I getting a nullpointer exception? Can anyone help?

applicationContext.xml

<bean id="baseController" class="controllers.BaseController">
    <property name="rightFrame" ref="defaultRightFrame" />
  </bean>

  <bean id="adminController" class="controllers.AdminController" parent="baseController">
    <property name="rightFrame" ref="adminRightFrame" />
  </bean>

  <bean id="defaultRightFrame" class="util.RightFrameImpl" />
  <bean id="adminRightFrame" class="util.AdminRightFrameImpl" />

BaseController

public class BaseController {
  protected RightFrame rightFrame;

  public BaseController(){}

  public RightFrame getRightFrame() { return rightFrame; }

  public void setRightFrame(RightFrame rightFrame) {
    this.rightFrame = rightFrame;
  }
}

AdminController

public class AdminController extends BaseController {}

MenuController

public class MenuController extends AdminController {

  @RequestMapping("/admin/viewMainMenu.do")
  public String viewAdminMenu(HttpServletRequest request, ModelMap model) {

    rightFrame.setTest("This is a test"); //rightFrame is NULL!!!!!!

    return "viewAdminMainMenu";
  }
}

Interface RightFrame

public interface RightFrame {
 public void setTest(String test);
}

AdminRightFrameImpl

public class AdminRightFrameImpl implements RightFrame{
  private String test;

  @Override
  public void setTest(String t){
    test = t;
  }

}

[amiladomingo]

Is it a problem with the way you have configured the MenuController bean in your application context?

BTW you have forgot to post the MenuController configuration