added api and resource not found exceptions with global exception han…

…dler

src/main/java/com/vedasole/ekartecommercebackend/exception/APIException.java

@@ -0,0 +1,10 @@
+package com.vedasole.ekartecommercebackend.exception;
+
+public class APIException extends RuntimeException {
+
+    public APIException() { }
+
+    public APIException(String message) {
+        super(message);
+    }
+}

src/main/java/com/vedasole/ekartecommercebackend/exception/GlobalExceptionHandler.java

@@ -0,0 +1,57 @@
+package com.vedasole.ekartecommercebackend.exception;
+
+import com.vedasole.ekartecommercebackend.payload.ApiResponse;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.validation.FieldError;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+import java.util.HashMap;
+import java.util.Map;
+
+@RestControllerAdvice
+public class GlobalExceptionHandler {
+
+    @ExceptionHandler(ResourceNotFoundException.class)
+    public ResponseEntity<ApiResponse> resourceNotFoundExceptionHandler(
+            ResourceNotFoundException ex
+    ){
+        String message = ex.getMessage();
+        ApiResponse apiResponse = new ApiResponse(message, false);
+
+        return new ResponseEntity<>(
+                apiResponse,
+                HttpStatus.NOT_FOUND
+        );
+    }
+
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    public ResponseEntity<Map<String, String>> methodArgumentNotValidExceptionHandler(
+            MethodArgumentNotValidException ex
+    ){
+        HashMap<String, String> errorList = new HashMap<>();
+
+        ex.getAllErrors().forEach(e -> {
+            String objectName = ((FieldError)e).getField();
+            String message = e.getDefaultMessage();
+            errorList.put(objectName, message);
+        });
+
+        return new ResponseEntity<>(errorList, HttpStatus.BAD_REQUEST);
+    }
+
+    @ExceptionHandler(APIException.class)
+    public ResponseEntity<ApiResponse> APIExceptionHandler(APIException ex) {
+
+        String message = ex.getMessage();
+        ApiResponse apiResponse = new ApiResponse(message, true);
+
+        return new ResponseEntity<>(
+                apiResponse,
+                HttpStatus.BAD_REQUEST
+        );
+
+    }
+
+}

src/main/java/com/vedasole/ekartecommercebackend/exception/ResourceNotFoundException.java

@@ -0,0 +1,38 @@
+package com.vedasole.ekartecommercebackend.exception;
+
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+public class ResourceNotFoundException extends RuntimeException {
+
+    private String resourceName;
+    private String fieldName;
+    private String fieldValue;
+
+    public ResourceNotFoundException(String resourceName,
+                                     String fieldName,
+                                     String fieldValue) {
+
+        super(String.format("%s not found with %s : %s",
+                resourceName, fieldName, fieldValue));
+
+        this.setResourceName(resourceName);
+        this.setFieldName(fieldName);
+        this.setFieldValue(fieldValue);
+    }
+
+    public ResourceNotFoundException(String resourceName,
+                                     String fieldName,
+                                     Long fieldValue) {
+
+        super(String.format("%s not found with %s : %s",
+                resourceName, fieldName, fieldValue));
+
+        this.setResourceName(resourceName);
+        this.setFieldName(fieldName);
+        this.setFieldValue(fieldValue.toString());
+    }
+
+}