primefaces - Set to null JSF spinner -

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in project using spinner jsf primefaces library. i'm trying when textbox cleared value set null, set minimum value defined.

somebody can give me hint or direction?

i trying make onblur event didn't workout.

try : should prevent 0 affected variable when leaving empty in view, , set null.

<h:outputlabel for="spinner1" value="enter integer : " />   <p:spinner id="spinner1" value="#{bean.number1}" >       <p:ajax listener="#{bean.spinner1changed}" /> </p:spinner>

with :

integer number1; //  + getter/setter  public void spinner1changed(ajaxbehaviorevent event) {     if (number1 == null) number1 = null; }

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