--- a/langtools/src/jdk.jdeps/share/classes/com/sun/tools/javap/ConstantWriter.java	Fri Jul 29 09:35:31 2016 -0700
+++ b/langtools/src/jdk.jdeps/share/classes/com/sun/tools/javap/ConstantWriter.java	Fri Jul 29 12:27:08 2016 -0700
@@ -385,6 +385,10 @@
                         sb.append('\\').append('\\');
                         break;
                     default:
+                        if (Character.isISOControl(c)) {
+                            sb.append(String.format("\\u%04x", (int) c));
+                            break;
+                        }
                         sb.append(c);
                 }
             }