call validator class from java file

[moyphus]

Hi to all,

              i want to call validator class from java file

<h:selectOneMenu id="prcompname1" validator="#{empmasterHome.validateComponentName}" value="#{sys.prcompId}" rendered="#{sys.prcompId==null}">
     <f:selectItem itemLabel="#{messages.Select}" itemValue="select"/>
     <f:selectItems value="#{empmasterHome.getComponentName(i)}"/>
     <a:support event="onchange" reRender="prcompNameField,calcType,prCompDesc,AmountField" ajaxSingle="true" action="#{empmasterHome.getCompDesc(sys.prcompId,i)}"/>
</h:selectOneMenu>

validator="#{empmasterHome.validateComponentName}"

Instead of this i want to call
now its asking for

this.validateComponentName(facescontext,UIcomponent,value)

what value to be passed on

(facescontext,UIComponent,value)

from Java.. How's it possible.....