diff --git a/core/launcher/src/main/java/io/quarkus/launcher/RuntimeLaunchClassLoader.java b/core/launcher/src/main/java/io/quarkus/launcher/RuntimeLaunchClassLoader.java
index 691afcc0f3c7b..95a30f95f76c8 100644
--- a/core/launcher/src/main/java/io/quarkus/launcher/RuntimeLaunchClassLoader.java
+++ b/core/launcher/src/main/java/io/quarkus/launcher/RuntimeLaunchClassLoader.java
@@ -1,6 +1,5 @@
 package io.quarkus.launcher;
 
-import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.URL;
@@ -18,20 +17,14 @@ public RuntimeLaunchClassLoader(ClassLoader parent) {
 
     @Override
     protected Class<?> findClass(String name) throws ClassNotFoundException {
-        String resourceName = name.replace(".", "/") + ".class";
+        String resourceName = "META-INF/ide-deps/" + name.replace(".", "/") + ".class.ide-launcher-res";
         try {
-            try (InputStream is = getResourceAsStream(resourceName)) {
+            try (InputStream is = getParent().getResourceAsStream(resourceName)) {
                 if (is == null) {
                     throw new ClassNotFoundException(name);
                 }
                 definePackage(name);
-                byte[] buf = new byte[1024];
-                int r;
-                ByteArrayOutputStream out = new ByteArrayOutputStream();
-                while ((r = is.read(buf)) > 0) {
-                    out.write(buf, 0, r);
-                }
-                byte[] bytes = out.toByteArray();
+                byte[] bytes = is.readAllBytes();
 
                 return defineClass(name, bytes, 0, bytes.length);
             }