--- old/src/jdk/nashorn/internal/runtime/PropertyMap.java	2015-07-29 16:34:39.356502800 +0530
+++ new/src/jdk/nashorn/internal/runtime/PropertyMap.java	2015-07-29 16:34:38.876500400 +0530
@@ -990,10 +990,10 @@
            for (final Property p : map0.getProperties()) {
                final Property p2 = map1.findProperty(p.getKey());
                if (p2 == null) {
-                   sb.append("FIRST ONLY : [" + p + "]");
+                   sb.append("FIRST ONLY : [").append(p).append("]");
                    found = true;
                } else if (p2 != p) {
-                   sb.append("DIFFERENT  : [" + p + "] != [" + p2 + "]");
+                   sb.append("DIFFERENT  : [").append(p).append("] != [").append(p2).append("]");
                    found = true;
                }
            }
@@ -1001,7 +1001,7 @@
            for (final Property p2 : map1.getProperties()) {
                final Property p1 = map0.findProperty(p2.getKey());
                if (p1 == null) {
-                   sb.append("SECOND ONLY: [" + p2 + "]");
+                   sb.append("SECOND ONLY: [").append(p2).append("]");
                    found = true;
                }
            }