VMClassLoader.getBootPackages only looks at the first URL returned by
getResources. This is a problem in case this first entry is the
META-INF/INDEX.LIST of an endorsed jar instead of glibj.zip. In this
case the boot packages are not found.

The following is a patch against VMClassLoader.java of CACAO that solves
the problem by reading the package lists of all URLs returned by
getResources:

Index: src/lib/vm/reference/java/lang/VMClassLoader.java
===================================================================
--- src/lib/vm/reference/java/lang/VMClassLoader.java   (revision 4867)
+++ src/lib/vm/reference/java/lang/VMClassLoader.java   (working copy)
@@ -265,12 +265,15 @@
    */
   private static String[] getBootPackages()
   {
-    URL indexList = getResource("META-INF/INDEX.LIST");
-    if (indexList != null)
-      {
+       Enumeration urls = getResources("META-INF/INDEX.LIST");
+       Set packageSet = new HashSet();
+
+    while (urls.hasMoreElements())
+         {
+        URL indexList = (URL) urls.nextElement();
+
         try
           {
-            Set packageSet = new HashSet();
             String line;
             int lineToSkip = 3;
             BufferedReader reader = new BufferedReader(
@@ -289,15 +292,12 @@
                   lineToSkip--;
               }
             reader.close();
-            return (String[]) packageSet.toArray(new String[packageSet.size()]);
           }
         catch (IOException e)
           {
-            return new String[0];
           }
-      }
-    else
-      return new String[0];
+         }
+       return (String[]) packageSet.toArray(new String[packageSet.size()]);
   }