Index: RemotingGrailsPlugin.groovy
===================================================================
--- RemotingGrailsPlugin.groovy	(revision 41387)
+++ RemotingGrailsPlugin.groovy	(working copy)
@@ -112,7 +112,7 @@
 
             // Finally add the custom HandlerMapping.
             remotingUrlHandlerMapping(RemotingUrlHandlerMapping) {
-                invokerTypes = remoteExporters.keySet()
+                invokerTypes = new HashSet(remoteExporters.keySet())
             }
         }
     }