diff --git a/dev/core/src/com/google/gwt/dev/cfg/ResourceLoaders.java b/dev/core/src/com/google/gwt/dev/cfg/ResourceLoaders.java
index 746082d..987e1d9 100644
--- a/dev/core/src/com/google/gwt/dev/cfg/ResourceLoaders.java
+++ b/dev/core/src/com/google/gwt/dev/cfg/ResourceLoaders.java
@@ -15,12 +15,15 @@
  */
 package com.google.gwt.dev.cfg;
 
+import static com.google.gwt.thirdparty.guava.common.base.StandardSystemProperty.JAVA_CLASS_PATH;
+
+import com.google.gwt.thirdparty.guava.common.base.Splitter;
+
 import java.io.File;
 import java.net.MalformedURLException;
 import java.net.URL;
-import java.net.URLClassLoader;
+import java.nio.file.Paths;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.List;
 
 /**
@@ -32,6 +35,8 @@
     private final ClassLoader wrapped;
 
     public ClassLoaderAdapter(ClassLoader wrapped) {
+      // TODO(rluble): Maybe stop wrapping arbitrary class loaders here and always use the
+      // system ClassLoader.
       this.wrapped = wrapped;
     }
 
@@ -45,15 +50,15 @@
     }
 
     /**
-     * Returns the URLs of the wrapped ClassLoader and each parent that's a URLClassLoader.
+     * Returns the URLs for the system class path.
      */
     @Override
     public List<URL> getClassPath() {
       List<URL> result = new ArrayList<URL>();
-      for (ClassLoader candidate = wrapped; candidate != null; candidate = candidate.getParent()) {
-        if (candidate instanceof URLClassLoader) {
-          URL[] urls = ((URLClassLoader) candidate).getURLs();
-          result.addAll(Arrays.asList(urls));
+      for (String entry : Splitter.on(File.pathSeparatorChar).split(JAVA_CLASS_PATH.value())) {
+        try {
+          result.add(Paths.get(entry).toUri().toURL());
+        } catch (MalformedURLException e) {
         }
       }
       return result;