setting hidden variable to entity

now I need help with setting variable. I have two entities Season and Tournament, tournament belongs to season. So now I created one season and I see the list of this season. I have here one button "select" which should save actual season to session scope:

public String selectSezona(Sezona sezona){
        this.sezona = sezona;
        return "index";
    }

so now I have selected one season and now I wanna created tournament in this season but I dont wanna select season so I write this:

<h:inputHidden value="#{turnaje.turnaj.setSezona(sezony.sezona)}" />

this is hidden input text which should assign actual season to this tournament but this wont work :( . Error is: javax.el.PropertyNotWritableException . I see that season is set because I see its name. How tou figure this issue ? please help thx

edit:

I also have getter and setter in tournament

@ManyToOne
private S开发者_如何学编程ezona sezona;

public Sezona getSezona() {
        return sezona;
    }

    public void setSezona(Sezona sezona) {
        this.sezona = sezona;
    }

but why should I have method setSezona without parameter ?

Well, you have a selectSezona(...) method, but not a setSezona(...).

In fact, your hidden field would require a property as its value, not a method. Your setSezona(...) doesn't return anything, however, JSF needs a way to get the initial value. Thus, you'd need to change the expression to #{turnaje.turnaj.sezona}.

You'd still get an error, since JSF can't convert between String and Sezona, so you also need to provide a converter to your hidden field.