Create your own Custom Exception

  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);  
     }  
 }