oracle adf - Input text validation when is empty -

i have 3 dependent text boxes. is, department, class , subclass. when department fill class of inputtext enable , when preecho class subclass enable. make process not had difficulties. however, can not make reverse process when delete, example, value of department should put disable class , delete value. not because events, when empty not trigger new event , therefore not enter else if. text boxes have autosuggest behavior , class depends on chosen department , subclass of class. class , subclass have associated partialtriggers.

my code of input text department (with valuechangelistener setdepartment()):

 public void setdepartment(valuechangeevent valuechangeevent) {          dciteratorbinding dc2 = (dciteratorbinding)evaluteel("#{bindings.scpclassview1iterator}");         viewobject vo2 = dc2.getviewobject();         vo2.applyviewcriteria(vo2.getviewcriteriamanager().getviewcriteria("scpclassviewcriteria"));         if (it7.getvalue() == null) {             vo2.ensurevariablemanager().setvariablevalue("p_dept", null);         } else {             string deptiddesc = valuechangeevent.getnewvalue().tostring();             int indexofseparator = deptiddesc.indexof("-");             string deptid = deptiddesc.substring(0, indexofseparator - 1);             vo2.ensurevariablemanager().setvariablevalue("p_dept", deptid);         }         vo2.executequery();         if (valuechangeevent.getnewvalue().tostring().isempty()) {             getit8().setdisabled(true);         }  else {             getit8().setdisabled(false);         }  

did try run code in debug mode , set breakpoint inside setdepartment method? confirm whether setdepartment method invoked on clearing off data department input. also, looking @ code, feel throw exception when input empty. if (it7.getvalue() == null) evaluate false when clear off data, it7 have blank value instead. here need use if (valuechangeevent.getnewvalue().tostring().isempty())