How to detect JBO Exception from within Apps Module Custom Method ?

Question

Hi all,
I have a custom method in apps module (AM) to set "Status" attribute to "A' in an antity, this is for approval.
Also there is a rule that the transaction cannot be approved if it is already cancelled by another user (in multi user environment).
The problem is :
If the AM custom method fail (because it throws JBOException in the entity setter method), How can I know that it fails ?
and report it back to the backing beans that call the custom method ?
Thank you for your help,
xtanto
Below is the code :
1. create a custom method in AM to do : setStatus ("A") ;
public void approve(){
ViewObject bphVo = findViewObject("BpHView1");
BpHViewRowImpl vBphViewRow = (BpHViewRowImpl)bphVo.getCurrentRow();
vBphViewRow.setStatus("A");
2. Do a validation inside setStatus method of the entity :
public void setStatus(String value) {
if (! getCancel() == true )
setAttributeInternal(STATUS, value);
else
throw new JboException("Error ! transaction already cancelled");
3. On backing beans :
public String approveButton_action() {
BindingContainer bindings = getBindings();
OperationBinding operationBinding =
bindings.getOperationBinding("approve");
Object result = operationBinding.execute();
if (!operationBinding.getErrors().isEmpty()) {
System.out.println("There is JBO Error !!");
return null;
else{
commitButton_action();
return "back";
}

Answer 1

Try this code:
approveButtonAction()  {
String navigationString = null;
try {
Object result = operationBinding.execute();
naviagionString = success;
catch (JboException e) {
   navigationString = null;
   (DCBindingContainer)bc.cacheException(e);
} finally {
if(navigationString != null)
  return commitButtonAction();
else
  return navigationString;
}