Edit

vaddin allows setting an com.vaadin.server.ErrorHandler for UIs and components. The caveat with this builtin appraoch is that there is only one com.vaadin.server.ErrorHandler for any type of errors. Therefore it would make sense to implement a DelegatingErrorHandler to which handlers for specific types of errors can be registered:

class DelegatingErrorHandler implements ErrorHandler {

 Map<<? extends Exception>, ErrorTypeHandler<? extends Exception>> handlerMap;

 ErrorHandler defaultHandler;

 public void error(ErrorEvent event){

    if(handlerMap.get(type) = null){
      handlerMap.get(type).handleError(
    } else {
       defaultHandler.error(event);
    }

 public <E extends Exception> void registerHandler(Class<E> type, ErrorTypeHandler<E> handler){
    handlerMap.put(type, handler);
 }
}

class abstract ErrorTypeHandler<E extends Exception> implements ErrorHandler {


  public final void error(ErrorEvent event){
     handleError((E)event);
  }

  public abstract void handleError(<E> event);
}

something like this.