--- o.n.bootstrap/src/org/netbeans/ModuleManager.java	
+++ o.n.bootstrap/src/org/netbeans/ModuleManager.java	
@@ -892,8 +892,12 @@ 
     private void subCreate(Module m) throws DuplicateException {
         Module old = get(m.getCodeNameBase());
         if (old != null) {
+            if (System.getProperty("netbeans.ignore.dupmodule", "false").equalsIgnoreCase("false")) {
             throw new DuplicateException(old, m);
+            } else {
+                Util.err.warning("Duplicate loading ignored: " + old + " and " + m);
         }
+        }
         modules.add(m);
         modulesByName.put(m.getCodeNameBase(), m);
         providersOf.possibleProviderAdded(m);