ExceptionHandling

Exception Handling : 

differnce between classNotFoundException and noClassDefError(similar to noBeanDefinationException in spring.)

try
catch 
finally 

checked excption 
unchecked excpetion 

custom exception special catogery.
can be created in 2 ways 
-- extending Exception Class -- for checked while complie time.
   Public class InsufficientFundException extends Exception{
     public InsufficientFundException(String message){
      super(message);
     }
   }
-- extending RuntimeException Class -- for runtime No need to check at run time.
   Public class InvalidAccountException extends RuntimeException{
     public InvalidAccountException(String message){
      super(message);
     }
   }



gloabl exception 
in spring we use a special case were @ControllerAdvice and @ExceptionHandler
 here @ControlerAdvice is a class level excpetion.
      @ExceptionHandler in is a method level exception. (it can also accomidate multiple classes at the same time to handle.)