fix: validation 과정에서 NullPointException이 발생할 수 있는 버그 수정

src/main/java/com/playkuround/playkuroundserver/global/validation/EnumValidator.java

@@ -15,16 +15,13 @@ public void initialize(ValidEnum constraintAnnotation) {
     @Override
     public boolean isValid(String value, ConstraintValidatorContext context) {
         Object[] enumValues = this.annotation.enumClass().getEnumConstants();
-
         if (enumValues != null) {
             for (Object enumValue : enumValues) {
-                // 대소문자 구분하지 않기
-                if (value.equalsIgnoreCase(enumValue.toString())) {
+                if (enumValue.toString().equalsIgnoreCase(value)) {
                     return true;
                 }
             }
         }
-
         return false;
     }
 }

src/main/java/com/playkuround/playkuroundserver/global/validation/LatitudeValidator.java

@@ -11,6 +11,7 @@ public void initialize(Latitude constraintAnnotation) {
 
     @Override
     public boolean isValid(Double value, ConstraintValidatorContext context) {
+        if (value == null) return false;
         return -90 <= value && value <= 90;
     }
 

src/main/java/com/playkuround/playkuroundserver/global/validation/LongitudeValidator.java

@@ -11,6 +11,7 @@ public void initialize(Longitude constraintAnnotation) {
 
     @Override
     public boolean isValid(Double value, ConstraintValidatorContext context) {
+        if (value == null) return false;
         return -180 <= value && value <= 180;
     }
 

src/main/java/com/playkuround/playkuroundserver/global/validation/ValidEnum.java

@@ -2,6 +2,7 @@
 
 import jakarta.validation.Constraint;
 import jakarta.validation.Payload;
+
 import java.lang.annotation.ElementType;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
@@ -12,7 +13,7 @@
 @Retention(RetentionPolicy.RUNTIME)
 public @interface ValidEnum {
 
-    String message() default "Enum 에 없는 값입니다.";
+    String message() default "잘못된 데이터입니다.";
 
     Class<?>[] groups() default {};
 

src/test/java/com/playkuround/playkuroundserver/JavaTest.java

@@ -0,0 +1,23 @@
+package com.playkuround.playkuroundserver;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.AssertionsForClassTypes.assertThatThrownBy;
+
+public class JavaTest {
+
+    @Test
+    @DisplayName("Wrapper가 null일 때는 비교 연산자를 사용할 수 없다.(NullPointerException)")
+    void wrapperTest() {
+        Double value = null;
+
+        assertThatThrownBy(() -> {
+            boolean result = value <= 90.0;
+        }).isInstanceOf(NullPointerException.class);
+
+        assertThatThrownBy(() -> {
+            boolean result = value == 90.0;
+        }).isInstanceOf(NullPointerException.class);
+    }
+}