Index: applications/editors/josm/plugins/walkingpapers/src/org/openstreetmap/josm/plugins/walkingpapers/WalkingPapersLayer.java
===================================================================
--- applications/editors/josm/plugins/walkingpapers/src/org/openstreetmap/josm/plugins/walkingpapers/WalkingPapersLayer.java	(revision 30197)
+++ applications/editors/josm/plugins/walkingpapers/src/org/openstreetmap/josm/plugins/walkingpapers/WalkingPapersLayer.java	(revision 30737)
@@ -112,5 +112,5 @@
 
     public void clearTileStorage() {
-        tileStorage = new HashMap<WalkingPapersKey, WalkingPapersTile>();
+        tileStorage = new HashMap<>();
         checkTileStorage();
     }
@@ -141,5 +141,5 @@
         if (now - lastCheck < 1000) return;
         lastCheck = now;
-        TreeSet<WalkingPapersTile> tiles = new TreeSet<WalkingPapersTile>(new TileTimeComp());
+        TreeSet<WalkingPapersTile> tiles = new TreeSet<>(new TileTimeComp());
         tiles.addAll(tileStorage.values());
         int max_nr_tiles = 100;