Removed most exception handlers from spring-rest-full (except the ones used in other articles) and moved them to spring-boot-rest

spring-boot-rest/src/main/java/com/baeldung/web/error/RestResponseEntityExceptionHandler.java

@@ -0,0 +1,86 @@
+package com.baeldung.web.error;
+
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.http.converter.HttpMessageNotReadableException;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.context.request.WebRequest;
+import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler;
+
+import com.baeldung.web.exception.MyDataAccessException;
+import com.baeldung.web.exception.MyDataIntegrityViolationException;
+import com.baeldung.web.exception.MyResourceNotFoundException;
+
+@ControllerAdvice
+public class RestResponseEntityExceptionHandler extends ResponseEntityExceptionHandler {
+
+    public RestResponseEntityExceptionHandler() {
+        super();
+    }
+
+    // API
+
+    // 400
+    /*
+     *  Some examples of exceptions that we could retrieve as 400 (BAD_REQUEST) responses:
+     *  Hibernate's ConstraintViolationException
+     *  Spring's DataIntegrityViolationException
+     */
+    @ExceptionHandler({ MyDataIntegrityViolationException.class })
+    public ResponseEntity<Object> handleBadRequest(final MyDataIntegrityViolationException ex, final WebRequest request) {
+        final String bodyOfResponse = "This should be application specific";
+        return handleExceptionInternal(ex, bodyOfResponse, new HttpHeaders(), HttpStatus.BAD_REQUEST, request);
+    }
+
+    @Override
+    protected ResponseEntity<Object> handleHttpMessageNotReadable(final HttpMessageNotReadableException ex, final HttpHeaders headers, final HttpStatus status, final WebRequest request) {
+        final String bodyOfResponse = "This should be application specific";
+        // ex.getCause() instanceof JsonMappingException, JsonParseException // for additional information later on
+        return handleExceptionInternal(ex, bodyOfResponse, headers, HttpStatus.BAD_REQUEST, request);
+    }
+
+    @Override
+    protected ResponseEntity<Object> handleMethodArgumentNotValid(final MethodArgumentNotValidException ex, final HttpHeaders headers, final HttpStatus status, final WebRequest request) {
+        final String bodyOfResponse = "This should be application specific";
+        return handleExceptionInternal(ex, bodyOfResponse, headers, HttpStatus.BAD_REQUEST, request);
+    }
+
+
+    // 404
+    /*
+     *  Some examples of exceptions that we could retrieve as 404 (NOT_FOUND) responses:
+     *  Java Persistence's EntityNotFoundException
+     */
+    @ExceptionHandler(value = { MyResourceNotFoundException.class })
+    protected ResponseEntity<Object> handleNotFound(final RuntimeException ex, final WebRequest request) {
+        final String bodyOfResponse = "This should be application specific";
+        return handleExceptionInternal(ex, bodyOfResponse, new HttpHeaders(), HttpStatus.NOT_FOUND, request);
+    }
+
+    // 409
+    /*
+     *  Some examples of exceptions that we could retrieve as 409 (CONFLICT) responses:
+     *  Spring's InvalidDataAccessApiUsageException
+     *  Spring's DataAccessException
+     */
+    @ExceptionHandler({ MyDataAccessException.class})
+    protected ResponseEntity<Object> handleConflict(final RuntimeException ex, final WebRequest request) {
+        final String bodyOfResponse = "This should be application specific";
+        return handleExceptionInternal(ex, bodyOfResponse, new HttpHeaders(), HttpStatus.CONFLICT, request);
+    }
+
+    // 412
+
+    // 500
+
+    @ExceptionHandler({ NullPointerException.class, IllegalArgumentException.class, IllegalStateException.class })
+    /*500*/public ResponseEntity<Object> handleInternal(final RuntimeException ex, final WebRequest request) {
+        logger.error("500 Status Code", ex);
+        final String bodyOfResponse = "This should be application specific";
+        return handleExceptionInternal(ex, bodyOfResponse, new HttpHeaders(), HttpStatus.INTERNAL_SERVER_ERROR, request);
+    }
+
+}

spring-boot-rest/src/main/java/com/baeldung/web/exception/MyDataAccessException.java

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+package com.baeldung.web.exception;
+
+public final class MyDataAccessException extends RuntimeException {
+
+    public MyDataAccessException() {
+        super();
+    }
+
+    public MyDataAccessException(final String message, final Throwable cause) {
+        super(message, cause);
+    }
+
+    public MyDataAccessException(final String message) {
+        super(message);
+    }
+
+    public MyDataAccessException(final Throwable cause) {
+        super(cause);
+    }
+
+}

spring-boot-rest/src/main/java/com/baeldung/web/exception/MyDataIntegrityViolationException.java

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+package com.baeldung.web.exception;
+
+public final class MyDataIntegrityViolationException extends RuntimeException {
+
+    public MyDataIntegrityViolationException() {
+        super();
+    }
+
+    public MyDataIntegrityViolationException(final String message, final Throwable cause) {
+        super(message, cause);
+    }
+
+    public MyDataIntegrityViolationException(final String message) {
+        super(message);
+    }
+
+    public MyDataIntegrityViolationException(final Throwable cause) {
+        super(cause);
+    }
+
+}

spring-boot-rest/src/main/java/com/baeldung/web/exception/MyResourceNotFoundException.java

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+package com.baeldung.web.exception;
+
+public final class MyResourceNotFoundException extends RuntimeException {
+
+    public MyResourceNotFoundException() {
+        super();
+    }
+
+    public MyResourceNotFoundException(final String message, final Throwable cause) {
+        super(message, cause);
+    }
+
+    public MyResourceNotFoundException(final String message) {
+        super(message);
+    }
+
+    public MyResourceNotFoundException(final Throwable cause) {
+        super(cause);
+    }
+
+}