src/java.base/share/classes/java/lang/System.java

*** 52,11 ***
  import java.util.Map;
  import java.util.Objects;
  import java.util.Properties;
  import java.util.ResourceBundle;
  import java.util.Set;
- import java.util.concurrent.Executor;
  import java.util.function.Supplier;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.stream.Stream;
  
  import jdk.internal.javac.Restricted;
--- 52,10 ---

*** 2321,11 ***
                  } else {
                      throw new IllegalArgumentException();
                  }
              }
  
!             public Executor virtualThreadDefaultScheduler() {
                  return VirtualThread.defaultScheduler();
              }
  
              public StackWalker newStackWalkerInstance(Set<StackWalker.Option> options,
                                                        ContinuationScope contScope,
--- 2320,15 ---
                  } else {
                      throw new IllegalArgumentException();
                  }
              }
  
!             public Thread.VirtualThreadScheduler builtinVirtualThreadScheduler() {
+                 return VirtualThread.builtinScheduler(true);
+             }
+ 
+             public Thread.VirtualThreadScheduler defaultVirtualThreadScheduler() {
                  return VirtualThread.defaultScheduler();
              }
  
              public StackWalker newStackWalkerInstance(Set<StackWalker.Option> options,
                                                        ContinuationScope contScope,