Java Development Tools

hi am geting two same error when validation,i what to display only one error message

am in jdeveloper 11.1.1.6.0,am geting duplicate validation error message

this is how am doing validation

<af:inputText value="#{bindings.Organisationname.inputValue}"
                                  simple="true"
                                  columns="20"
                                  maximumLength="#{bindings.Organisationname.hints.precision}"
                                  shortDesc="#{bindings.Organisationname.hints.tooltip}"
                                  id="it1" autoSubmit="true" required="true"
                                  validator="#{pageFlowScope.orgvalidation.chkOrgName}"
                                  label="Organisation Name">
                      <f:validator binding="#{bindings.Organisationname.validator}"/>
                    </af:inputText>





public String checkName(String orgname){



ResultSet rs;



Row curPerson;



String value= null;



OrgAppModuleImpl am =(OrgAppModuleImpl)ADFUtils.getApplicationModuleForDataControl("OrgAppModuleDataControl");



try {



System.out.println("valueadded "+orgname.toUpperCase());



value =am.findbyOrgname(orgname.toUpperCase().trim());



System.out.println("valueadded "+value);







} 




catch (Exception e) {







e.printStackTrace();



}



return value;




}





public void chkOrgName(FacesContext facesContext, UIComponent uIComponent,



Object object) {



// Add event code here...



String value =(String)object;



String evalue=  checkName(value);



if( evalue == null){







}else{



FacesMessage message = new FacesMessage();



message.setSeverity(FacesMessage.SEVERITY_ERROR);



message.setSummary("Organisation Name already exists.");



FacesContext context =  FacesContext.getCurrentInstance();



context.addMessage("esecurity", message);



throw new ValidatorException(message);



}