src/java.base/share/classes/java/lang/ref/Cleaner.java

*** 23,36 ****
   * questions.
   */
  
  package java.lang.ref;
  
  import java.util.Objects;
  import java.util.concurrent.ThreadFactory;
! 
! import jdk.internal.ref.CleanerImpl;
  
  /**
   * {@code Cleaner} manages a set of object references and corresponding cleaning actions.
   * <p>
   * Cleaning actions are {@link #register(Object object, Runnable action) registered}
--- 23,37 ----
   * questions.
   */
  
  package java.lang.ref;
  
+ import jdk.internal.ref.CleanerImpl;
+ 
  import java.util.Objects;
  import java.util.concurrent.ThreadFactory;
! import java.util.function.Function;
  
  /**
   * {@code Cleaner} manages a set of object references and corresponding cleaning actions.
   * <p>
   * Cleaning actions are {@link #register(Object object, Runnable action) registered}
*** 133,143 ****
       * The Cleaner implementation.
       */
      final CleanerImpl impl;
  
      static {
!         CleanerImpl.setCleanerImplAccess((Cleaner c) -> c.impl);
      }
  
      /**
       * Construct a Cleaner implementation and start it.
       */
--- 134,149 ----
       * The Cleaner implementation.
       */
      final CleanerImpl impl;
  
      static {
!         CleanerImpl.setCleanerImplAccess(new Function<Cleaner, CleanerImpl>() {
!             @Override
!             public CleanerImpl apply(Cleaner cleaner) {
!                 return cleaner.impl;
!             }
!         });
      }
  
      /**
       * Construct a Cleaner implementation and start it.
       */