Create your own Custom Exception

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public class CustomExceptionExample {        public static void main(String[] args) {            // We demonstrate with a short password          try {               CustomExceptionExample.checkPass("pass");           } catch (InvalidPassException e) {               e.printStackTrace();           }                         // We demonstrate with no password           try {                CustomExceptionExample.checkPass(null);           } catch (InvalidPassException e) {               e.printStackTrace();           }             }             // Our business method that check password validity and throws InvalidPassException       public static void checkPass(String pass) throws InvalidPassException {           int minPassLength = 5;           try {                if (pass.length() < minPassLength)                   throw new InvalidPassException("The password provided is too short");           } catch (NullPointerException e) {              throw new InvalidPassException("No password provided", e);           }       }   }        // A custom business exception    class InvalidPassException extends Exception {            InvalidPassException() {       }             InvalidPassException(String message) {          super(message);       }              InvalidPassException(String message, Throwable cause) {           super(message, cause);       }   }