diff --git a/independent-projects/bootstrap/runner/src/main/java/io/quarkus/bootstrap/runner/RunnerClassLoader.java b/independent-projects/bootstrap/runner/src/main/java/io/quarkus/bootstrap/runner/RunnerClassLoader.java
index 02c7c100e23c2..d02b6cf0a8dfc 100644
--- a/independent-projects/bootstrap/runner/src/main/java/io/quarkus/bootstrap/runner/RunnerClassLoader.java
+++ b/independent-projects/bootstrap/runner/src/main/java/io/quarkus/bootstrap/runner/RunnerClassLoader.java
@@ -32,7 +32,8 @@ public final class RunnerClassLoader extends ClassLoader {
     private final Set<String> nonExistentResources;
     // the following two fields go hand in hand - they need to both be populated from the same data
     // in order for the resource loading to work properly
-    private final Set<String> fullyIndexedDirectories;
+    // normally this field would be a set, but it only contains 2 elements, so making it a list is actually better
+    private final List<String> fullyIndexedDirectories;
     private final Map<String, ClassLoadingResource[]> directlyIndexedResourcesIndexMap;
 
     //Mutations protected by synchronization on the field value itself:
@@ -42,7 +43,7 @@ public final class RunnerClassLoader extends ClassLoader {
 
     RunnerClassLoader(ClassLoader parent, Map<String, ClassLoadingResource[]> resourceDirectoryMap,
             Set<String> parentFirstPackages, Set<String> nonExistentResources,
-            Set<String> fullyIndexedDirectories, Map<String, ClassLoadingResource[]> directlyIndexedResourcesIndexMap) {
+            List<String> fullyIndexedDirectories, Map<String, ClassLoadingResource[]> directlyIndexedResourcesIndexMap) {
         super(parent);
         this.resourceDirectoryMap = resourceDirectoryMap;
         this.parentFirstPackages = parentFirstPackages;
diff --git a/independent-projects/bootstrap/runner/src/main/java/io/quarkus/bootstrap/runner/SerializedApplication.java b/independent-projects/bootstrap/runner/src/main/java/io/quarkus/bootstrap/runner/SerializedApplication.java
index b3e8b88bdc60a..a838802f51db3 100644
--- a/independent-projects/bootstrap/runner/src/main/java/io/quarkus/bootstrap/runner/SerializedApplication.java
+++ b/independent-projects/bootstrap/runner/src/main/java/io/quarkus/bootstrap/runner/SerializedApplication.java
@@ -11,7 +11,6 @@
 import java.nio.file.Path;
 import java.nio.file.attribute.BasicFileAttributes;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Collection;
 import java.util.Enumeration;
 import java.util.HashMap;
@@ -20,7 +19,6 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
-import java.util.function.BiConsumer;
 import java.util.jar.Attributes;
 import java.util.jar.JarFile;
 import java.util.jar.Manifest;
@@ -36,7 +34,7 @@ public class SerializedApplication {
 
     public static final String META_INF_VERSIONS = "META-INF/versions/";
     // the files immediately (i.e. not recursively) under these paths should all be indexed
-    private static final Set<String> FULLY_INDEXED_PATHS = new LinkedHashSet<>(Arrays.asList("", "META-INF/services"));
+    private static final List<String> FULLY_INDEXED_PATHS = List.of("", "META-INF/services");
 
     private static final int MAGIC = 0XF0315432;
     private static final int VERSION = 2;
@@ -210,7 +208,8 @@ private static List<String> writeJar(DataOutputStream out, Path jar) throws IOEx
                 if (!entry.getName().contains("/")) {
                     hasDefaultPackage = true;
                     if (!entry.getName().isEmpty() && FULLY_INDEXED_PATHS.contains("")) {
-                        fullyIndexedPaths.computeIfAbsent("", s -> new ArrayList<>(10)).add(entry.getName());
+                        fullyIndexedPaths.computeIfAbsent("", SerializedApplication::newFullyIndexedPathsValue)
+                                .add(entry.getName());
                     }
                 } else if (!entry.isDirectory()) {
                     //some jars don't have correct directory entries
@@ -222,7 +221,7 @@ private static List<String> writeJar(DataOutputStream out, Path jar) throws IOEx
                     if (entry.getName().startsWith(META_INF_VERSIONS)) {
                         //multi release jar
                         //we add all packages here
-                        //they may no be relevant for some versions, but that is fine
+                        //they may not be relevant for some versions, but that is fine
                         String part = entry.getName().substring(META_INF_VERSIONS.length());
                         int slash = part.indexOf("/");
                         if (slash != -1) {
@@ -233,12 +232,14 @@ private static List<String> writeJar(DataOutputStream out, Path jar) throws IOEx
                         }
                     }
 
-                    for (String path : FULLY_INDEXED_PATHS) {
+                    for (int i = 0; i < FULLY_INDEXED_PATHS.size(); i++) {
+                        String path = FULLY_INDEXED_PATHS.get(i);
                         if (path.isEmpty()) {
                             continue;
                         }
                         if (entry.getName().startsWith(path)) {
-                            fullyIndexedPaths.computeIfAbsent(path, s -> new ArrayList<>(10)).add(entry.getName());
+                            fullyIndexedPaths.computeIfAbsent(path, SerializedApplication::newFullyIndexedPathsValue)
+                                    .add(entry.getName());
                         }
                     }
                 }
@@ -258,6 +259,10 @@ private static List<String> writeJar(DataOutputStream out, Path jar) throws IOEx
         }
     }
 
+    private static List<String> newFullyIndexedPathsValue(String ignored) {
+        return new ArrayList<>(10);
+    }
+
     private static void collectPackages(Path jar, Set<String> dirs) throws IOException {
         if (Files.isDirectory(jar)) {
             //this can only really happen when testing quarkus itself
@@ -356,14 +361,13 @@ void addResourceDir(String dir, JarResource resource) {
         }
 
         Map<String, ClassLoadingResource[]> getResult() {
-            overrides.forEach(new BiConsumer<String, Set<? extends ClassLoadingResource>>() {
-                @Override
-                public void accept(String dir, Set<? extends ClassLoadingResource> jarResources) {
-                    result.put(dir, jarResources.toArray(EMPTY_ARRAY));
-                }
-            });
+            overrides.forEach(this::addToResult);
             return result;
         }
+
+        private void addToResult(String dir, Set<? extends ClassLoadingResource> jarResources) {
+            result.put(dir, jarResources.toArray(EMPTY_ARRAY));
+        }
     }
 
 }