Declarative Exception Handling

• The login() method in the SecurityService class may throw an InvalidLoginException
• However, this method is not protected by an enclosing try-catch
• This is permissible since the enclosing execute() method is declared to throw a general Exception
• How does Struts know what to do with an InvalidLoginException?
  • Consults the global-exceptions element in struts-config.xml
  • This element specifies the property name (attribute key) under which to find an error message in the resource bundle