How to get managedbean property from another bean in JSF

Question

I searched similar questions but I'm a bit confused. I have a login page, so LoginBean also which is;

@ManagedBean(name = "loginBean")
@SessionScoped
public class LoginBean implements Serializable {    
    private String password="";
    private String image="";
    @ManagedProperty(value = "#{loginBeanIdentityNr}")
    private String identityNr="";
...

after success, navigates to orderlist page, so I have also OrderBean.

@ManagedBean(name = "OrderBean")
@SessionScoped
       public class OrderBean {
            List<Ordery> sdList;

            public List<Order> getSdList() {

                try {

                    String identityNr ="";
                    ELContext elContext = FacesContext.getCurrentInstance().getELContext();
                    LoginBean lBean = (LoginBean) FacesContext.getCurrentInstance().getApplication().getELResolver().getValue(elContext, null, "loginBean");
                    identityNr =lBean.getIdentityNr();
                    sdList = DatabaseUtil.getOrderByIdentityNr(identityNr);
    ...
    }

I don't need the whole LoginBean, just ManagedProperty "loginBeanIdentityNr". But this code below doesn't work (of course);

identityNr = (String) FacesContext.getCurrentInstance()
                        .getApplication().getELResolver()
                        .getValue(elContext, null, "loginBeanIdentityNr");

this time it returns null to me. I think if I need whole bean property, I can inject these beans, right? So, do you have any suggestions for this approach? can<f:attribute> be used?

Answer 1

The @ManagedProperty declares the location where JSF should set the property, not where JSF should "export" the property. You need to just inject the LoginBean as property of OrderBean.

public class OrderBean {

    @ManagedProperty(value="#{loginBean}")
    private LoginBean loginBean; // +setter

    // ...
}

This way you can access it in the OrderBean by just

loginBean.getIdentityNr();

---

Alternatively, if you make your OrderBean request or view scoped, then you can also set only the identityNr property.

public class OrderBean {

    @ManagedProperty(value="#{loginBean.identityNr}")
    private String identityNr; // +setter

    // ...
}

---

Unrelated to the concrete problem: initializing String properties with an empty string is a poor practice.