jsf - Applying request values to entity bean loaded with id from inputHidden before other fields -

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i have facelet template with:

<f:metadata>     <o:viewparam name="id" value="#{homebean.id}" /> </f:metadata>                  <h:form>     <h:inputhidden value="#{homebean.id}" />     <h:inputtext value="#{homebean.user.firstname}" />     <h:commandbutton value="submit" action="#{homebean.onsave()}" /> </h:form>

and request scoped bean with:

@named @requestscoped public class homebean {     private integer id;     private user user;      public void setid(integer id) {       system.out.println("setid called");       user = // code loading user entity bean supplied id     }      // other accessors id , user }

initial page load works well, entity loaded , displayed in form, inputhidden set entity id. problem submit throws: 

javax.el.propertynotfoundexception - target unreachable, base expression '. user' resolved null

probably because getuser called before setid. how can solve this? have request scoped bean, know can solved @ least viewaccess scoped bean.

edit: noticed exception thrown in process validations phase, thought exception thrown in update model values phase. changed "private user" "private user user = new user()" , it's ok, feels little weird.

regards, pavel

the omnifaces <o:viewparam> sets request parameter in initial request , not in postbacks. intented used @viewscoped beans request parameter isn't unnecessarily been validated, converted , updated on every single postback (because it's still present in view scoped bean). api documentation , showcase example explicitly mentions should used view scoped beans.

you've there request scoped bean trashed , recreated on every single request, on postbacks same view. user property disappears , falls default null on every subsequent postback request.

there 2 ways fix it:

  1. replace <o:viewparam> <f:viewparam>. call setter on every request, on postbacks.

  2. replace @named @requestscoped @managedbean @viewscoped, way bean live long you're interacting same view. or if insist in using cdi, use @named @conversationscoped instead, have manage begin , end of conversation yourself.


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