diff --git a/src/test/java/org/kohsuke/github/AotIntegrationTest.java b/src/test/java/org/kohsuke/github/AotIntegrationTest.java
index 5273f8ac9a..d37b062136 100644
--- a/src/test/java/org/kohsuke/github/AotIntegrationTest.java
+++ b/src/test/java/org/kohsuke/github/AotIntegrationTest.java
@@ -63,18 +63,20 @@ public void testIfAllRequiredClassesAreRegisteredForAot() throws IOException {
         Stream<String> generatedAotConfigClassNames = Stream.concat(generatedReflectConfigStreamOfClassNames,
                 generatedSerializationStreamOfNames);
 
-        generatedAotConfigClassNames.forEach(generatedReflectionConfigClassName -> {
+        List<String> missingClasses = generatedAotConfigClassNames
+                .filter(name -> !providedReflectionAndNoReflectionConfigNames.contains(name))
+                .collect(Collectors.toList());
+
+        if (!missingClasses.isEmpty()) {
             try {
-                if (!providedReflectionAndNoReflectionConfigNames.contains(generatedReflectionConfigClassName)) {
-                    fail(String.format(
-                            Files.readString(
-                                    Path.of("./target/test-classes/reflection-and-serialization-test-error-message")),
-                            generatedReflectionConfigClassName));
-                }
+                String errorTemplate = Files
+                        .readString(Path.of("./target/test-classes/reflection-and-serialization-test-error-message"));
+                String classList = missingClasses.stream().map(name -> "  - " + name).collect(Collectors.joining("\n"));
+                fail(String.format(errorTemplate, classList));
             } catch (IOException e) {
                 throw new RuntimeException(e);
             }
-        });
+        }
 
     }
 
diff --git a/src/test/resources/reflection-and-serialization-test-error-message b/src/test/resources/reflection-and-serialization-test-error-message
index a60293d3e6..54fe199ecf 100644
--- a/src/test/resources/reflection-and-serialization-test-error-message
+++ b/src/test/resources/reflection-and-serialization-test-error-message
@@ -1,19 +1,21 @@
-The class "%1$s" needs to be configured or excluded for reflection / serialization and was not mentioned in one of the following resources:
+The following classes need to be configured or excluded for reflection / serialization:
 
-Please do one of the following:
-1. add "%1$s" to serialization.json and / or reflect-config.json
-2. add "%1$s" to no-reflect-and-serialization-list 
+%1$s
 
-DO NOT do both. 
+For each class, please do one of the following:
+1. add it to serialization.json and / or reflect-config.json
+2. add it to no-reflect-and-serialization-list
+
+DO NOT do both.
 
 Option 1:
-The class is serialized or reflected over. Includes "GH*" classes the are populated using Jackson.
-Does not include Builders and other classes that are only used locally. 
+The class is serialized or reflected over. Includes "GH*" classes that are populated using Jackson.
+Does not include Builders and other classes that are only used locally.
 
 src/main/resources/META-INF/reflect-config.json - example:
 
   {
-    "name": "%1$s",
+    "name": "org.kohsuke.github.GHExample",
     "allPublicFields": true,
     "allDeclaredFields": true,
     "queryAllPublicConstructors": true,
@@ -31,7 +33,7 @@ src/main/resources/META-INF/reflect-config.json - example:
 src/main/resources/META-INF/serialization.json - example:
 
   {
-    "name": "%1$s"
+    "name": "org.kohsuke.github.GHExample"
   }
 
 Option 2:
@@ -39,7 +41,7 @@ The class is not serialized or reflected over. This is less common.
 
 src/test/resources/no-reflect-and-serialization-list - example:
 
-  %1$s
+  org.kohsuke.github.GHExample