NullPointerException When trying to Get Session Scoped Bean data in another ManagedBean

Question

hello
i wont to access to some data in my session scoped bean from a request bean so when i try to get this data all i get is 
com.sun.faces.mgbean.ManagedBeanCreationException: An error occurred performing resource injection
on managed bean «discussionlaoder»
in the end of the exception there is
Caused by: java.lang.NullPointerException at Hiber.discussionlaoder.init(discussionlaoder.java:35)
this is my code:
1-the request scoped bean
@ManagedBean
@RequestScoped
public class discussionlaoder {
  private MyadmninHelper halper;
@ManagedProperty(value="#{serviceBean}")
     private ServicesBean  serviceBean;
    @PostConstruct
    public void init() {
      halper=getServiceBean().getHalper();  // line 35
//seter and geter code
2-the sesions scoped bean
@ManagedBean (eager=true)
@SessionScoped
public class ServicesBean {
    private MyadmninHelper halper;
//seter and geter code
am using glassfish server 3.1
thank's for help

Answer 1

What you need to do is fix all those typos in your code, then you don't have to override names.
- the proper Java class name is DiscussionLoader, not discussionlaoder (fix english typo also)
- if you want to inject a class named ServicesBean, then also call the property the same.
@ManagedProperty
public ServicesBean servicesBean;
But what you're doing now is call the class 'ServicesBean' and then in your managed bean declaration you seem to change your mind and it should all of a sudden be 'serviceBean'. Well then rename the class so you don't have your typo anymore!