Java custom exception

Question

I have successfully implemented a custom exception using below code

CarNotFoundException.Java

 public class CarNotFoundException extends Exception 
       {        
            private static final long serialVersionUID = 1L;

            public CarNotFoundException(String msg) {
                super(msg);
            }
        }

Car.Java

public static CarProvider getInstanceByProvider(String provider) throws CarNotFoundException {
        if(!provider.equals(Constants.BMW || Constants.B||Constants.C{ 
            throw new CarNotFoundException("Car Not Found");
            }   
        return carProvider;
    }

CarTest.java

        try 
        {
          carProvider = Car.getInstanceByProvider(provider);    
        } catch (CarNotFoundException e) {
            e.printstacktrace();
        }

What I want to do ?

Instead of e.printStackTrace(); when I calle.getMessage(), I get nothing(blank).

How I can make custom e.getMessage() ?

Edit : I got my answer, I missed System.out.println()

Thanks for helping..!

Your custom exception seems to be CarNotFoundException, but you're catching a ProviderNotFoundException. The e.getMessage() will work just fine with the code in CarNotFoundException. — Kayaman
– Kayaman, Commented Nov 26, 2016 at 9:03
Are you sure you are calling e.getMessage() ? There is no problem with the code you are showing above. — Vasu
– Vasu, Commented Nov 26, 2016 at 9:31
e.getMessage() will get the message. Are you printing it? System.out.println(e.getMessage()); — denvercoder9
– denvercoder9, Commented Nov 26, 2016 at 9:36

PVR · Accepted Answer · 2016-11-26 09:36:23Z

1

Override getMessage() method in your custom exception

public class CarNotFoundException extends Exception 
{        
     private static final long serialVersionUID = 1L;

     public String message;

     public CarNotFoundException(String msg) {
         this.message = msg;
     }

  // Overrides Exception's getMessage()
     @Override
     public String getMessage(){
         return message;
     }
 }

edited Nov 26, 2016 at 9:36

answered Nov 26, 2016 at 9:22

PVR

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9 Comments

Prakash P Over a year ago

tried this but not working

public class CarNotFoundException extends Exception {  	private static final long serialVersionUID = 1L; 	 	private String message; 	 	public CarNotFoundException(String message) { 		 		this.message = message; 	} 	 	@Override 	public String getMessage() { 		return message;	 	} }

PVR Over a year ago

What message you get?

Prakash P Over a year ago

I get nothing, blank message

PVR Over a year ago

Write System.out.print(e.getMessage());

Mark Rotteveel Over a year ago

This is totally unnecessary, as similar code already exists in Throwable.

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