Error handling

src/main/java/me/braydon/mc/exception/ExceptionControllerAdvice.java

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+package me.braydon.mc.exception;
+
+import lombok.NonNull;
+import me.braydon.mc.model.response.ErrorResponse;
+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 org.springframework.web.bind.annotation.ResponseStatus;
+
+/**
+ * Advice for handling raised exceptions.
+ *
+ * @author Braydon
+ */
+@ControllerAdvice
+public final class ExceptionControllerAdvice {
+    @ExceptionHandler(Exception.class)
+    public ResponseEntity<?> handleException(@NonNull Exception ex) {
+        HttpStatus status = HttpStatus.INTERNAL_SERVER_ERROR; // Get the HTTP status
+        if (ex.getClass().isAnnotationPresent(ResponseStatus.class)) { // Get from the @ResponseStatus annotation
+            status = ex.getClass().getAnnotation(ResponseStatus.class).value();
+        }
+        String message = ex.getLocalizedMessage(); // Get the error message
+        if (message == null) { // Fallback
+            message = "An internal error has occurred.";
+        }
+        return new ResponseEntity<>(new ErrorResponse(status, message), status);
+    }
+}

src/main/java/me/braydon/mc/exception/impl/ResourceNotFoundException.java

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+package me.braydon.mc.exception.impl;
+
+import lombok.experimental.StandardException;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+/**
+ * This exception is raised
+ * when a resource is not found.
+ *
+ * @author Braydon
+ */
+@StandardException
+@ResponseStatus(HttpStatus.NOT_FOUND)
+public final class ResourceNotFoundException extends RuntimeException { }