feat(order, store, user): 전역 에러 핸들링 클래스 추가

- RestControllerAdvice 추가
- 사용자 에러 클래스 (CustomException)
- Spring Validation Exception (BindException, MethodArgumentNotValidException)

user-service/src/main/java/com/justpickup/userservice/global/exception/CustomException.java

@@ -0,0 +1,14 @@
+package com.justpickup.userservice.global.exception;
+
+import lombok.Getter;
+
+@Getter
+public class CustomException extends RuntimeException {
+
+    private ErrorEnum errorEnum;
+
+    protected CustomException(ErrorEnum errorEnum) {
+        super(errorEnum.getMessage());
+        this.errorEnum = errorEnum;
+    }
+}

user-service/src/main/java/com/justpickup/userservice/global/exception/ErrorEnum.java

@@ -0,0 +1,17 @@
+package com.justpickup.userservice.global.exception;
+
+import com.fasterxml.jackson.annotation.JsonFormat;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import org.springframework.http.HttpStatus;
+
+@Getter
+@AllArgsConstructor
+@JsonFormat(shape = JsonFormat.Shape.OBJECT)
+public enum ErrorEnum {
+
+    NOT_EXIST_USER(HttpStatus.CONFLICT, "존재하지 않은 사용자입니다.");
+
+    private final HttpStatus httpStatus;
+    private final String message;
+}

user-service/src/main/java/com/justpickup/userservice/global/exception/GlobalExceptionHandler.java

@@ -0,0 +1,74 @@
+package com.justpickup.userservice.global.exception;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.validation.BindException;
+import org.springframework.validation.BindingResult;
+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;
+
+@RestControllerAdvice
+@Slf4j
+public class GlobalExceptionHandler {
+
+    @ExceptionHandler(CustomException.class)
+    public ResponseEntity<ErrorBody> customExceptionHandler(CustomException ce) {
+        ErrorEnum errorEnum = ce.getErrorEnum();
+
+        log.warn("##################################################");
+        log.warn("## CustomException = {}", errorEnum);
+        log.warn("##################################################");
+
+        HttpStatus errorHttpStatus = errorEnum.getHttpStatus();
+
+        return ResponseEntity.status(errorHttpStatus)
+                .body(new ErrorBody(errorEnum.getMessage(), errorHttpStatus.getReasonPhrase()));
+    }
+
+    @ExceptionHandler(BindException.class)
+    public ResponseEntity<ErrorBody> bindExceptionHandler(BindException exception) {
+        return getValidationErrorBody(exception);
+    }
+
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    public ResponseEntity<ErrorBody> methodArgumentNotValidExceptionHandler(MethodArgumentNotValidException exception) {
+        return getValidationErrorBody(exception);
+    }
+
+    private ResponseEntity<ErrorBody> getValidationErrorBody(BindException exception) {
+        BindingResult bindingResult = exception.getBindingResult();
+
+        StringBuilder builder = new StringBuilder();
+        bindingResult.getFieldErrors()
+                .forEach(fieldError -> {
+                    builder.append("[");
+                    builder.append(fieldError.getField());
+                    builder.append("](은)는 ");
+                    builder.append(fieldError.getDefaultMessage());
+                    builder.append(" 입력된 값: [");
+                    builder.append(fieldError.getRejectedValue());
+                    builder.append("]");
+                });
+
+        ErrorBody errorBody = new ErrorBody(builder.toString(), HttpStatus.BAD_REQUEST.getReasonPhrase());
+
+        log.warn("##################################################");
+        log.warn("## getValidationErrorBody = {}", errorBody);
+        log.warn("##################################################");
+
+        return ResponseEntity.status(HttpStatus.BAD_REQUEST)
+                .body(errorBody);
+    }
+
+    @Data @NoArgsConstructor @AllArgsConstructor
+    static class ErrorBody {
+        private String message;
+        private String httpStatus;
+    }
+}