src/java.base/share/classes/jdk/internal/ref/CleanerImpl.java

*** 322,335 ****
          }
  
          final AtomicInteger cleanerThreadNumber = new AtomicInteger();
  
          public Thread newThread(Runnable r) {
!             return AccessController.doPrivileged(new PrivilegedAction<Thread>() {
                  @Override
                  public Thread run() {
!                     Thread t = new InnocuousThread(r);
                      t.setPriority(Thread.MAX_PRIORITY - 2);
                      t.setName("Cleaner-" + cleanerThreadNumber.getAndIncrement());
                      return t;
                  }
              });
--- 322,335 ----
          }
  
          final AtomicInteger cleanerThreadNumber = new AtomicInteger();
  
          public Thread newThread(Runnable r) {
!             return AccessController.doPrivileged(new PrivilegedAction<>() {
                  @Override
                  public Thread run() {
!                     Thread t = InnocuousThread.newThread(r);
                      t.setPriority(Thread.MAX_PRIORITY - 2);
                      t.setName("Cleaner-" + cleanerThreadNumber.getAndIncrement());
                      return t;
                  }
              });