Jsf / Spring request scoped bean -

as don't have experience in javaee programming , hasve noone ask, ask you. have 1 thing in code don't , think it's implemented in wrong way. managed bean request scoped. in jsf use rich:picklist takes data list.

@scope("request") public class mybean{      private list<string> sourcelist;      ....            public list<string> getsourcelist() {             //if (sourcelist == null)    <--- has no sence in request scoped bean              { sourcelist = service.loadlist();              }              return sourcelist;      }  ....  } 

i have submit button store data.

the problem is, each time when page actions (e.g. clicking submit button) method invoked every time , goes service layer, dao , database. seems not correct solution. how avoid it? thanks' answers.

if you're on jsf 2.0, can use new view scope @viewscoped.

@managedbean @viewscoped public class bean {      private list<foo> foos;      @ejb     private fooservice fooservice;      @postconstruct     public void init() {         foos = fooservice.list();     }      public list<foo> getfoos() {         return foos;     }  } 

when you're still on jsf 1.x, it's know richfaces' <a4j:keepalive> , tomahawk's <t:savestate> have same effect on request scoped bean above code design (i.e. not load data in getter):

<a4j:keepalive beanname="#{bean}" /> 

and

<t:savestate beanname="#{bean}" /> 

i haven't used new richfaces' @keepalive annotation, concerning docs, should behave same well.