Index: trunk/src/org/openstreetmap/josm/gui/MainApplication.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/MainApplication.java	(revision 10295)
+++ trunk/src/org/openstreetmap/josm/gui/MainApplication.java	(revision 10296)
@@ -415,5 +415,5 @@
             CertificateAmendment.addMissingCertificates();
         } catch (IOException | GeneralSecurityException ex) {
-            ex.printStackTrace();
+            Main.warn(ex);
             Main.warn(getErrorMessage(Utils.getRootCause(ex)));
         }