Get selected value from a select one choice in the bean

I'm trying to do with the SelectOneChoice valueChangeListener and this is the code of my method, I'm using jdeveloper11g if alguin can help as I need the value you selected in the bean
public void cambioCombo(ValueChangeEvent valueChangeEvent) {
CoreSelectOneChoice csoc = (CoreSelectOneChoice) valueChangeEvent.getSource();
List childList = csoc.getChildren();
for (int i = 0; i < childList.size(); i++) {
if (childList.get(i) instanceof CoreSelectItem){
CoreSelectItem csi = (CoreSelectItem) childList.get(i);
if (((String)csi.getValue()).equals((String) valueChangeEvent.getNewValue()) ){
System.out.println("------------>"+csi.getLabel());
I get the following error when running the application and selecting in my select one choice
oracle.adf.view.rich.component.rich.input.RichSelectOneChoice cannot be cast to org.apache.myfaces.trinidad.component.core.input.CoreSelectOneChoice

This is an example of some code that i wrote.
public void changeDesc(ValueChangeEvent valueChangeEvent) {
// Add event code here...
System.out.println("value "+ valueChangeEvent.getNewValue().toString());
//System.out.println("old value "+ valueChangeEvent.getOldValue().toString());
if (valueChangeEvent.getNewValue().toString().equals("Area Uno")){
this.descripcion.setValue("RR.HH");
} else {
this.descripcion.setValue("Finanzas");
AdfFacesContext.getCurrentInstance().addPartialTarget(this.descripcion);
For get the Value select in the "SelectOneChice" component i use this: valueChangeEvent.getNewValue().toString()
cheers

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