Java 17 - implementing Custom handling Handling in Spring Boot REST Controller Returning 500 Errors
I'm learning this framework and I'm migrating some code and I'm working on a Spring Boot 2.7 application with Java 17, and I have implemented a global exception handler using `@ControllerAdvice`. However, when my service layer throws a custom exception, it's not being caught as expected, and I'm getting a 500 Internal Server behavior instead of the appropriate response. Here’s the relevant code for my custom exception and the global exception handler: ```java // Custom Exception public class ResourceNotFoundException extends RuntimeException { public ResourceNotFoundException(String message) { super(message); } } // Global Exception Handler @RestControllerAdvice public class GlobalExceptionHandler { @ExceptionHandler(ResourceNotFoundException.class) public ResponseEntity<String> handleResourceNotFound(ResourceNotFoundException ex) { return ResponseEntity.status(HttpStatus.NOT_FOUND).body(ex.getMessage()); } } ``` In my service layer, when I throw the `ResourceNotFoundException`, it does not seem to trigger the `handleResourceNotFound` method. Instead, I see the following behavior in my logs: ``` 2023-10-01 12:34:56 behavior 12345 --- [nio-8080-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Exception handling failed; nested exception is java.lang.RuntimeException: Something went wrong! ``` I've verified that the service is correctly throwing the exception, but it's as if the exception isn't being propagated to the controller advice layer. I tried moving the `@ControllerAdvice` to different packages, but that didn't resolve the scenario. Additionally, I have the following configuration in my `application.properties`: ``` spring.jackson.deserialization.unexpected result-on-unknown-properties=false ``` It's crucial for the application to return a 404 response when a resource is not found instead of a 500 behavior. Am I missing something in my configuration or implementation? Any insights would be appreciated! Is there a simpler solution I'm overlooking? For reference, this is a production mobile app. How would you solve this? I'm working in a Linux environment. Any help would be greatly appreciated! For reference, this is a production microservice.