Index: trunk/src/org/openstreetmap/josm/gui/dialogs/ValidatorListManagementDialog.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/dialogs/ValidatorListManagementDialog.java	(revision 14832)
+++ trunk/src/org/openstreetmap/josm/gui/dialogs/ValidatorListManagementDialog.java	(revision 14833)
@@ -118,7 +118,5 @@
                 if (answer == JOptionPane.YES_OPTION || answer == JOptionPane.NO_OPTION) {
                     OsmValidator.resetErrorList();
-                    tree.forEach((ignore, description) -> {
-                        OsmValidator.addIgnoredError(ignore, description);
-                    });
+                    tree.forEach(OsmValidator::addIgnoredError);
                     OsmValidator.saveIgnoredErrors();
                     OsmValidator.initialize();
@@ -200,5 +198,5 @@
     }
 
-    private void deleteAction(JTree tree, TreePath[] paths) {
+    private static void deleteAction(JTree tree, TreePath[] paths) {
         for (TreePath path : paths) {
             tree.clearSelection();