Index: src/java/org/apache/ivy/osgi/repo/AbstractOSGiResolver.java
===================================================================
--- src/java/org/apache/ivy/osgi/repo/AbstractOSGiResolver.java	(revision 1326555)
+++ src/java/org/apache/ivy/osgi/repo/AbstractOSGiResolver.java	(working copy)
@@ -294,7 +294,10 @@
 
     public ResolvedResource findArtifactRef(Artifact artifact, Date date) {
         URL url = artifact.getUrl();
-        Message.verbose("\tusing url for " + artifact + ": " + url);
+        if (url == null) {
+            return null;
+        }
+        Message.verbose("\tusing url for " + artifact + ": " + url.toExternalForm());
         logArtifactAttempt(artifact, url.toExternalForm());
         Resource resource = new URLResource(url);
         return new ResolvedResource(resource, artifact.getModuleRevisionId().getRevision());