UIInput.getValue returns old value

[Jan Bols]

I have a form with 2 fields field1 and field2. During validation field2  
inspects the value of field1 for a null value:
          UIInput uiField1 = (UIInput) toValidate.findComponent("field1");
          String field1Value = (String) uiField1.getValue();
          if (field1Value == null) {
            uiField1.setValid(false);
            message = "Error";
	    context.addMessage(uiField1.getClientId(context), new  
FacesMessage(message));
          }
The problem is that uiField1.getValue() returns the old value instead of  
the updated value. This only happens when the user deletes the value of  
field1. If the user specifies antoher (not null) value in field1  
uiField1.getValue() does return the correct new value.

Am I doing something wrong? Is this a bug?

Jan Bols