src/main/java/dev/submelon/pantry/CustomControllerAdvice.java


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package dev.submelon.pantry;

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.NoSuchElementException;

@ControllerAdvice
class CustomControllerAdvice {
    @ExceptionHandler(NoSuchElementException.class)
    public ResponseEntity<ErrorResponse> handleNullPointerExceptions(
        NoSuchElementException e
    ) {
        HttpStatus status = HttpStatus.NOT_FOUND;

        return new ResponseEntity<>(
            new ErrorResponse(status, e.getMessage()),
            status
        );
    }

    @ExceptionHandler(Exception.class)
    public ResponseEntity<ErrorResponse> handleExceptions(
        Exception e
    ) {
        HttpStatus status = HttpStatus.INTERNAL_SERVER_ERROR;

        // converting the stack trace to String
        StringWriter stringWriter = new StringWriter();
        PrintWriter printWriter = new PrintWriter(stringWriter);
        e.printStackTrace(printWriter);
        String stackTrace = stringWriter.toString();

        return new ResponseEntity<>(
            new ErrorResponse(
              status, 
              e.getMessage(), 
              stackTrace // specifying the stack trace in case of 500s
            ),
            status
        );
    }
}