From 8e1693862a96dac9e6a728cb8f2d06bb8905670f Mon Sep 17 00:00:00 2001
From: Ian Knight <128476114+knighto82@users.noreply.github.com>
Date: Mon, 13 Jan 2025 16:55:30 +0000
Subject: [PATCH] Mutations.

---
 .../io/github/jpmorganchase/fusion/model/VarArgsHelper.java  | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/main/java/io/github/jpmorganchase/fusion/model/VarArgsHelper.java b/src/main/java/io/github/jpmorganchase/fusion/model/VarArgsHelper.java
index e230dea..4effb2d 100644
--- a/src/main/java/io/github/jpmorganchase/fusion/model/VarArgsHelper.java
+++ b/src/main/java/io/github/jpmorganchase/fusion/model/VarArgsHelper.java
@@ -27,12 +27,13 @@ public static Map<String, Object> initializeMap() {
     }
 
     public static Set<String> getFieldNames(Set<String> exclusions, Class<?> resourceClass) {
+        Set<String> mutated = new HashSet<>(exclusions);
         if (null != resourceClass) {
-            exclusions.addAll(Arrays.stream(resourceClass.getDeclaredFields())
+            mutated.addAll(Arrays.stream(resourceClass.getDeclaredFields())
                     .map(Field::getName)
                     .filter(n -> !"this$0".equals(n))
                     .collect(Collectors.toSet()));
         }
-        return exclusions;
+        return mutated;
     }
 }