Index: /applications/editors/josm/plugins/pt_assistant/src/org/openstreetmap/josm/plugins/pt_assistant/PTAssistantPlugin.java
===================================================================
--- /applications/editors/josm/plugins/pt_assistant/src/org/openstreetmap/josm/plugins/pt_assistant/PTAssistantPlugin.java	(revision 33388)
+++ /applications/editors/josm/plugins/pt_assistant/src/org/openstreetmap/josm/plugins/pt_assistant/PTAssistantPlugin.java	(revision 33389)
@@ -40,5 +40,5 @@
 
     /* list of relation currently highlighted by the layer */
-    private static List<Relation> highlightedRelations;
+    private static List<Relation> highlightedRelations = new ArrayList<>();
 
     /* item of the Tools menu for repeating the last fix */
@@ -60,5 +60,4 @@
         OsmValidator.addTest(PTAssistantValidatorTest.class);
 
-        highlightedRelations = new ArrayList<>();
         RepeatLastFixAction repeatLastFixAction = new RepeatLastFixAction();
         EditHighlightedRelationsAction editHighlightedRelationsAction = new EditHighlightedRelationsAction();
@@ -103,11 +102,6 @@
     public static void setLastFix(PTRouteSegment segment) {
         lastFix = segment;
-
-        SwingUtilities.invokeLater(new Runnable() {
-            @Override
-            public void run() {
-                repeatLastFixMenu.setEnabled(segment != null);
-            }
-        });
+        SwingUtilities.invokeLater(() ->
+        	repeatLastFixMenu.setEnabled(segment != null));
     }
 
@@ -128,22 +122,13 @@
 		highlightedRelations.add(highlightedRelation);
 		if(!editHighlightedRelationsMenu.isEnabled()) {
-			SwingUtilities.invokeLater(new Runnable() {
-	            @Override
-	            public void run() {
-	            	editHighlightedRelationsMenu.setEnabled(true);
-	            }
-	        });
+			SwingUtilities.invokeLater(() ->
+				editHighlightedRelationsMenu.setEnabled(true));
 		}
-
 	}
 
 	public static void clearHighlightedRelations() {
 		highlightedRelations.clear();
-		SwingUtilities.invokeLater(new Runnable() {
-            @Override
-            public void run() {
-            	editHighlightedRelationsMenu.setEnabled(false);
-            }
-        });
+		SwingUtilities.invokeLater(() ->
+            	editHighlightedRelationsMenu.setEnabled(false));
 	}
 }