Fixing some errors on test execution

Author: luismr

src/main/java/dev/luismachadoreis/flighttracker/server/ping/domain/Ping.java

@@ -9,6 +9,7 @@
 
 import java.time.Instant;
 import java.util.UUID;
+import java.util.Arrays;
 
 @Entity
 @Getter
@@ -160,17 +161,27 @@ public record Position(
     public static class IntegerArrayConverter implements AttributeConverter<Integer[], String> {
         @Override
         public String convertToDatabaseColumn(Integer[] attribute) {
-            if (attribute == null) return "";
-            return String.join(",", java.util.Arrays.stream(attribute)
+            if (attribute == null) {
+                return null;
+            }
+            if (attribute.length == 0) {
+                return "";
+            }
+            return String.join(",", Arrays.stream(attribute)
                 .map(String::valueOf)
                 .toArray(String[]::new));
         }
 
         @Override
         public Integer[] convertToEntityAttribute(String dbData) {
-            if (dbData == null || dbData.isEmpty()) return new Integer[0];
-            return java.util.Arrays.stream(dbData.split(","))
-                .map(Integer::valueOf)
+            if (dbData == null) {
+                return null;
+            }
+            if (dbData.isEmpty()) {
+                return new Integer[0];
+            }
+            return Arrays.stream(dbData.split(","))
+                .map(Integer::parseInt)
                 .toArray(Integer[]::new);
         }
     }