--- java/org/apache/catalina/loader/WebappClassLoader.java	(revision 983308)
+++ java/org/apache/catalina/loader/WebappClassLoader.java	(working copy)
@@ -3206,6 +3206,8 @@ 
             return false;
         if (name.startsWith("java."))
             return false;
+        if (name.startsWith("javax.servlet."))
+            return false;
 
         return true;