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

@@ -37,6 +37,10 @@
  * @since   1.5
  */
 public abstract class ExceptionProxy implements java.io.Serializable {
     private static final long serialVersionUID = 7241930048386631401L;
     protected abstract RuntimeException generateException();
+    /**
+     * String to use when printed out in an annotation
+     */
+    public abstract String memberToString();
 }