error handling / exception handling

Does anyone know how error handling can be customized in Web Dynpro?

Currently they just mention three "standardized" messages that can be shown to the user: standard, warning and error. Also, they emphasize form validation instead of going into the guts of error handling.

Does anyone know how to log these errors, handle the stack trace, take different actions based on any errors (exceptions), etc.?

Thanks for your help!