There are multiple ways to get the value of Selectonechoice's value,and the most simple way is using this method:



    public void reff(ValueChangeEvent valueChangeEvent) {
        DCBindingContainer dc = (DCBindingContainer)BindingContext.getCurrent().getCurrentBindingsEntry();
        DCIteratorBinding iter=dc.findIteratorBinding("EmployeesView1Iterator");
        AttributeBinding attr = (AttributeBinding)dc.getControlBinding("deptid1");
       iter.getViewObject().setWhereClause("department_id=:maindeptid");
       iter.getViewObject().defineNamedWhereClauseParam("maindeptid", null, null);
        iter.getViewObject().setNamedWhereClauseParam("maindeptid", valueChangeEvent.getNewValue());
        System.out.println("Old value is"+attr);
       iter.executeQuery();


My Selectonechoice component's source:

<af:selectOneChoice value="#{bindings.deptid1.inputValue}"
                                            label="#{bindings.DepartmentId.label}"
                                            required="#{bindings.DepartmentId.hints.mandatory}"
                                            shortDesc="#{bindings.DepartmentId.hints.tooltip}" id="soc1"
                                            autoSubmit="true" valueChangeListener="#{refresh.reff}">
                            <f:selectItems value="#{bindings.DepartmentId.items}" id="si1"/>
                        </af:selectOneChoice>