Java Community | Help. Code. Learn.•6mo ago

how to properly handle case when theres no records in the db table?

hey guys. so i have my CustomerRepo in my service and i want to handle a scenario when there are no customers with given id. so far i have this:

Optional<Customer> customer=customerRepository.findById(Long.valueOf(paymentInformationRequest.getClientId()));
        if (customer.isEmpty()) {
            log.info("BGWService.createPaymentInformation. no customer with id: {}", paymentInformationRequest.getClientId());
            throw new IllegalArgumentException("BGWService.createPaymentInformation. no customer with id:"+paymentInformationRequest.getClientId());
        }

Optional<Customer> customer=customerRepository.findById(Long.valueOf(paymentInformationRequest.getClientId()));
        if (customer.isEmpty()) {
            log.info("BGWService.createPaymentInformation. no customer with id: {}", paymentInformationRequest.getClientId());
            throw new IllegalArgumentException("BGWService.createPaymentInformation. no customer with id:"+paymentInformationRequest.getClientId());
        }

but i was wondering if i can do smth better? thx

20 Replies

JavaBot•6mo ago

⌛ This post has been reserved for your question.

Hey @bambyzas! Please use /close or the Close Post button above when your problem is solved. Please remember to follow the help guidelines. This post will be automatically closed after 300 minutes of inactivity.

TIP: Narrow down your issue to simple and precise questions to maximize the chance that others will reply in here.

tjoener•6mo ago

use .orElseThrow on optional to throw an exception Preferably an exception you define yourself that means that a customer isn't found CustomerNotFoundException or something similar. This you can catch in a @ControllerAdvice And then do the logging there

bambyzasOP•6mo ago

u mean smth like this?

@ControllerAdvice
public class RestResponseEntityExceptionHandler extends ResponseEntityExceptionHandler {
    @ExceptionHandler(value={IllegalArgumentException.class, IllegalStateException.class})
    protected ResponseEntity<Object> handleConflict(RuntimeException runtimeException, WebRequest webRequest) {
        String bodyOfResponse = "This should be application specific";
        return handleExceptionInternal(runtimeException, bodyOfResponse,new HttpHeaders(), HttpStatus.CONFLICT, webRequest);
    }
}

@ControllerAdvice
public class RestResponseEntityExceptionHandler extends ResponseEntityExceptionHandler {
    @ExceptionHandler(value={IllegalArgumentException.class, IllegalStateException.class})
    protected ResponseEntity<Object> handleConflict(RuntimeException runtimeException, WebRequest webRequest) {
        String bodyOfResponse = "This should be application specific";
        return handleExceptionInternal(runtimeException, bodyOfResponse,new HttpHeaders(), HttpStatus.CONFLICT, webRequest);
    }
}

tjoener•6mo ago

It's been a while, I'd have to look all that up, but yeah, something along those lines But don't do it for IllegalArgument or IllegalState Make your own exceptions so you have a clear definition of what went wrong

bambyzasOP•6mo ago

i have :

@ControllerAdvice
@Slf4j
public class RestResponseEntityExceptionHandler extends ResponseEntityExceptionHandler {
    @ExceptionHandler(value={IllegalArgumentException.class})

    protected ResponseEntity<Object> handleNoCustomerException(RuntimeException runtimeException, WebRequest webRequest) {
        //todo write custom exception when client doesnt exist

        log.info("BGWService.createPaymentpaymentConfirmation. NoCustomerException");

        String responseBody = "Customer with id"+;
        return handleExceptionInternal(runtimeException, responseBody,new HttpHeaders(), HttpStatus.CONFLICT, webRequest);
    }
}

@ControllerAdvice
@Slf4j
public class RestResponseEntityExceptionHandler extends ResponseEntityExceptionHandler {
    @ExceptionHandler(value={IllegalArgumentException.class})

    protected ResponseEntity<Object> handleNoCustomerException(RuntimeException runtimeException, WebRequest webRequest) {
        //todo write custom exception when client doesnt exist

        log.info("BGWService.createPaymentpaymentConfirmation. NoCustomerException");

        String responseBody = "Customer with id"+;
        return handleExceptionInternal(runtimeException, responseBody,new HttpHeaders(), HttpStatus.CONFLICT, webRequest);
    }
}

and i have a question. how to pass argument to this contoller advice? can i pass it when throwing an exception?

tjoener•6mo ago

Yes, with a custom exception you can have as many arguments as you want

JavaBot•6mo ago

💤 Post marked as dormant

This post has been inactive for over 300 minutes, thus, it has been archived. If your question was not answered yet, feel free to re-open this post or create a new one. In case your post is not getting any attention, you can try to use /help ping. Warning: abusing this will result in moderative actions taken against you.

bambyzasOP•6mo ago

but how do i know if i need checked or unchecked exception?

tjoener•6mo ago

That's up to you. There's merit in both

bambyzasOP•6mo ago

but i dont even understand how they work and whats the difference the more i read the less i understand

tjoener•6mo ago

Checked exceptions you have to either catch or declare explicitly (think IOException). Unchecked you don't (think IllegalArgumentException)

bambyzasOP•6mo ago

yes, i read that too, but it still doesnt explain a thing

tjoener•6mo ago

That's the difference

bambyzasOP•6mo ago

tjoener•6mo ago

That's literally the difference between the two Nothing more I can explain You can ask a new question so other people can help. I'm sure plenty of people have opinions on when to use one or the other

bambyzasOP•6mo ago

then maybe you can explain how to pass arguments to my custom exception? i have this so far:

            throw new NoCustomerException("BGWService.createPaymentInformation. no customer with id:"+paymentInformationRequest.getClientId());

            throw new NoCustomerException("BGWService.createPaymentInformation. no customer with id:"+paymentInformationRequest.getClientId());

but idk how to pass arguments

tjoener•6mo ago

An exception is just a class, so you can add fields and constructor parameters

bambyzasOP•6mo ago

so i added another field:

public class NoCustomerException extends Exception {
    public NoCustomerException(String message, String clientId ) {
        super(message);
    }
}

public class NoCustomerException extends Exception {
    public NoCustomerException(String message, String clientId ) {
        super(message);
    }
}

an i use it like this:

 throw new NoCustomerException("BGWService.createPaymentInformation. no customer with id:"+paymentInformationRequest.getClientId(),paymentInformationRequest.getClientId());

 throw new NoCustomerException("BGWService.createPaymentInformation. no customer with id:"+paymentInformationRequest.getClientId(),paymentInformationRequest.getClientId());

but how to access the clientId here?

@ControllerAdvice
@Slf4j
public class RestResponseEntityExceptionHandler extends ResponseEntityExceptionHandler {
    @ExceptionHandler(value={NoCustomerException.class})
    protected ResponseEntity<Object> handleNoCustomerException(RuntimeException runtimeException, WebRequest webRequest) {
        log.info("BGWService.createPaymentpaymentConfirmation. NoCustomerException");

        String responseBody = "Customer with id"+;
        return handleExceptionInternal(runtimeException, responseBody,new HttpHeaders(), HttpStatus.CONFLICT, webRequest);
    }

}

@ControllerAdvice
@Slf4j
public class RestResponseEntityExceptionHandler extends ResponseEntityExceptionHandler {
    @ExceptionHandler(value={NoCustomerException.class})
    protected ResponseEntity<Object> handleNoCustomerException(RuntimeException runtimeException, WebRequest webRequest) {
        log.info("BGWService.createPaymentpaymentConfirmation. NoCustomerException");

        String responseBody = "Customer with id"+;
        return handleExceptionInternal(runtimeException, responseBody,new HttpHeaders(), HttpStatus.CONFLICT, webRequest);
    }

}

tjoener•6mo ago

Use the right exception as the parameter to that method

JavaBot•6mo ago

💤 Post marked as dormant

This post has been inactive for over 300 minutes, thus, it has been archived. If your question was not answered yet, feel free to re-open this post or create a new one. In case your post is not getting any attention, you can try to use /help ping. Warning: abusing this will result in moderative actions taken against you.

Gaming

Programming

how to properly handle case when theres no records in the db table?

Did you find this page helpful?