Spring Boot Exception Handling: How to Handle Errors like a Pro

Spring Boot is an open-source Java-based framework that provides a simplified and opinionated approach to building enterprise-grade applications quickly and easily. It is built on top of the popular Spring Framework and provides a range of features and capabilities that make it easier to create standalone, production-ready Spring-based applications. Click here to know every detail of spring boot

How to handle exceptions in Spring Boot ?

Please refer the given link to understand how to build a REST API in spring boot, This blog will ground your fundamentals and will help you understand the exception handling in spring boot better.

Here's an example of how to handle exceptions in a Spring Boot application:

1. Create a custom exception class:

	public class CustomException extends RuntimeException {
    public CustomException(String message) {
        super(message);
    }
}

2. Create an exception handler:

@ControllerAdvice
public class CustomExceptionHandler {
    @ExceptionHandler(CustomException.class)
    public ResponseEntity<Object> handleException(
        CustomException ex, WebRequest request) {

        String message = ex.getMessage();
        ErrorDetails errorDetails = new ErrorDetails(
            new Date(), message, request.getDescription(false));

        return new ResponseEntity<>(errorDetails, HttpStatus.INTERNAL_SERVER_ERROR);
    }
}

3. Define the ErrorDetails class:

public class ErrorDetails {
    private Date timestamp;
    private String message;
    private String details;

    public ErrorDetails(Date timestamp, String message, String details) {
        super();
        this.timestamp = timestamp;
        this.message = message;
        this.details = details;
    }

    public Date getTimestamp() {
        return timestamp;
    }

    public String getMessage() {
        return message;
    }

    public String getDetails() {
        return details;
    }
}

4. Throw the custom exception in your application:

@GetMapping("/example")
public String example() {
    throw new CustomException("Example custom exception");
}

In this example, we created a custom exception class called CustomException that extends the RuntimeException class. We then created an exception handler using @ControllerAdvice and @ExceptionHandler annotations, which handles the CustomException and returns an ErrorDetails object with the error message, timestamp, and details of the request.

Finally, we threw the CustomException in our application to simulate an error scenario, which triggers the exception handler to return the error details. This is just a basic example, but you can customize the exception handling to suit your specific needs.

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