Doubt in Getting and Adding ManagedBean from FacesContext???

Question

Hi all,
I would like to know the proper way to get a managedBean instance from FacesContext.
let us consider the ways i follow normally
Way 1.
Mbean mBean=  (Mbean )FacesContext.getCurrentInstance().getExternalContext().getSessionMap().get(managedBean);
          if(mBean== null){
                    mBean = new Mbean();
                    FacesContext.getCurrentInstance().getExternalContext().getSessionMap().put(managedBean,mBean );
     Way 2.
Mbean  mBean = (Mbean)((ValueBinding) getValueBinding(getElExpr(beanName))).getValue(getFacesContext());Those two ways mentioned above are used to get the managed bean Mbean from context level,my query is which one out of
these two ways is the best?
what exactly getValueBinding(getElExpr(beanName))).getValue(getFacesContext()); line does?
Thanks in advance,
sundar.

Answer 1

Way 1 will break if you change the scope of the bean in the faces-config.xml. Way 2 won't.
Here are more ways: [http://balusc.blogspot.com/2006/06/communication-in-jsf.html#AccessingAnotherManagedBean].
If you're using JSF 1.1, I would use the createValueBinding approach. If you're using JSF 1.2, I would use the evaluateExpressionGet approach. But I more prefer the approach of injecting the one bean as a managed property of the other bean: [http://balusc.blogspot.com/2006/06/communication-in-jsf.html#InjectingManagedBeansInEachOther].