Oracle OAF : Displaying Exception Messages (Oracle Application Framework or OA Framework)

public void processFormRequest(OAPageContext pageContext, OAWebBean webBean)
{
  super.processFormRequest(pageContext, webBean);
  if(pageContext.getParameter("Condition1")!=null)
   {
    String name=pageContext.getParameter("ItemAttributeID");
 /* This will throw an error with the message name entered in ItemAttributeID */
    throw new OAException(name,OAException.ERROR);
/*  throw new OAException("Custom Message",OAException.ERROR); */
   }
  if(pageContext.getParameter("Condition2")!=null)
   {
    String name=pageContext.getParameter("ItemAttributeID");
 /* This will give us the confirmation message entered in ItemAttributeID */
    throw new OAException(name,OAException.CONFIRMATION);
   }
  if(pageContext.getParameter("Condition3")!=null)
   {
    String name=pageContext.getParameter("ItemAttributeID");
 /* This will give us the warning message entered in ItemAttributeID */
    throw new OAException(name,OAException.WARNING);
   }
 
    if(pageContext.getParameter("Condition4")!=null)
   {
    String name=pageContext.getParameter("ItemAttributeID");
 /* This will give us the warning message entered in ItemAttributeID */
    throw new OAException(message, OAException.INFORMATION);
   }

}