Index: src/java/org/datanucleus/metadata/MetaDataManager.java
===================================================================
--- src/java/org/datanucleus/metadata/MetaDataManager.java	(revision 2080)
+++ src/java/org/datanucleus/metadata/MetaDataManager.java	(working copy)
@@ -882,7 +882,7 @@
      * @param clr the ClassLoaderResolver
      * @return The ClassMetaData for this class (or null if not found)
      */
-    public synchronized AbstractClassMetaData getMetaDataForClass(Class c, ClassLoaderResolver clr)
+    public synchronized AbstractClassMetaData getMetaDataForClass(final Class c, final ClassLoaderResolver clr)
     {
         if (c == null)
         {
@@ -892,7 +892,10 @@
         {
             return null;
         }
-
+        AbstractClassMetaData ret = (AbstractClassMetaData)
+            AccessController.doPrivileged(
+                new PrivilegedAction () {
+                    public Object run () { 
         AbstractClassMetaData cmd = null;
         if (c.isInterface())
         {
@@ -932,6 +935,10 @@
 
         utilisedFileMetaData.clear();
         return cmd;
+                    }
+                }
+            ); 
+        return ret;
     }
 
     /**