diff --git a/framework/src/main/java/org/apache/felix/framework/ExtensionManager.java b/framework/src/main/java/org/apache/felix/framework/ExtensionManager.java
index aa67456..ac3f89e 100644
--- a/framework/src/main/java/org/apache/felix/framework/ExtensionManager.java
+++ b/framework/src/main/java/org/apache/felix/framework/ExtensionManager.java
@@ -19,6 +19,7 @@
 package org.apache.felix.framework;
 
 import java.io.IOException;
+import java.net.InetAddress; 
 import java.io.InputStream;
 import java.net.URL;
 import java.net.URLConnection;
@@ -526,6 +527,12 @@
         throw new IOException("Resource not provided by any extension!");
     }
 
+    protected InetAddress getHostAddress(URL u) 
+    { 
+        // the extension URLs do not address real hosts 
+        return null; 
+    }
+
     private synchronized void addExtension(Object source, Bundle extension)
     {
         List sourceExtensions = (List) m_sourceToExtensions.get(source);