--- old/src/java.base/share/classes/java/lang/invoke/ConstantBootstraps.java	2019-09-06 11:11:26.846589001 -0700
+++ new/src/java.base/share/classes/java/lang/invoke/ConstantBootstraps.java	2019-09-06 11:11:26.582589001 -0700
@@ -40,6 +40,12 @@
  * @since 11
  */
 public final class ConstantBootstraps {
+    /**
+     * Do not call.
+     */
+    @Deprecated(forRemoval=true, since="14")
+    public ConstantBootstraps() {}
+
     // implements the upcall from the JVM, MethodHandleNatives.linkDynamicConstant:
     /*non-public*/
     static Object makeConstant(MethodHandle bootstrapMethod,