Index: trunk/src/org/openstreetmap/josm/data/validation/TestError.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/validation/TestError.java	(revision 11306)
+++ trunk/src/org/openstreetmap/josm/data/validation/TestError.java	(revision 11307)
@@ -3,4 +3,5 @@
 
 import java.text.MessageFormat;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
@@ -118,5 +119,5 @@
          */
         public Builder primitives(OsmPrimitive... primitives) {
-            return primitives(Arrays.asList(primitives));
+            return primitives(new ArrayList<>(Arrays.asList(primitives)));
         }