jsf - Why my session scoped managed bean is not retaining value of property? -


i have session scoped managed bean propety:

private escalamensalstruct escalaorigem;

which set manually in method, let say, setescalaorigem(escalamensalstruct ems), when call method 

 public void sugerirdobra()     {         (final escalamensalstruct escaladiaria : cache.getinstance().getlistaescaladiaria())         {             if (escaladiaria.getlinha().equals(this.escalaorigem.getlinha()))             {                 if (escaladiaria.getfim() <= escaladiaria.getinicio())                 {                     this.listadobra.add(escaladiaria);                 }             }         }     }

escalaorigin null. bean viewscoped , changed sessionscoped thinking solve problem, continues trow nullpointerexception in first if. i'm 100% sure setescalaorigin method not receiving null, dont know else be.

edit: following code in button calld sugerirdobra , setting escalaorigem null. thats changing attribute's name without changing setter name.

<f:setpropertyactionlistener value="#{null}"     target="#{escaladiariatrocacontroller.escalaparatrocaorigem}"> </f:setpropertyactionlistener>


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