JSF request scope with get parameter

Question

i know there are many similar threads but no like mine:

I have a requestscope bean:

@ManagedBean @RequestScoped public class Bean implements Serializable{ private String username = ""; //managed by textbox private String password = ""; //managed by textbox private String id ="-"; //Load the Parameter as usual: @PostConstruct public void fetchParams(){ System.out.println("FETCH PARAMS"); FacesContext facesContext = FacesContext.getCurrentInstance(); String id = facesContext.getExternalContext().getRequestParameterMap().get("id"); if(id == null || id.length() == 0) return; setId(id); } // getters & setters public void doSomething(){ //executed when clicked on the sumbit-button on the jsf-site StaticFunctions.doSomething(this); } }

The code does following: it retrieves the get-parameter "id" and saves it into String id (confirmed by string.out....).

But when the method doSomething() is executed and the previously stored "id" is read and returns "-" (like nothing happened).

why is this so?

Community · Accepted Answer · 2017-05-23 10:25:28Z

Your ManagedBean is @RequestScoped and will be destroyed at the end of the request. When doSomething() is executed the user submitted the form and started a new request. So you should see "FETCH PARAMS" twice in the console because two Beans are created but for the second request id is null.

You can find a detailed explanation about the four JSF-Scopes here.

but is there any solution for my problem? how can i execute doSomething() correctly? username and password are executed correctly... only the id makes problems (because it doesn't have a textfield or anything?

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