src/java.base/share/classes/sun/reflect/annotation/EnumConstantNotPresentExceptionProxy.java

*** 1,7 ****
  /*
!  * Copyright (c) 2004, 2011, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
--- 1,7 ----
  /*
!  * Copyright (c) 2004, 2016, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
*** 43,48 ****
--- 43,53 ----
      }
  
      protected RuntimeException generateException() {
          return new EnumConstantNotPresentException(enumType, constName);
      }
+ 
+     @Override
+     public String toString() {
+         return constName + " /* Warning: constant not present! */";
+     }
  }