--- old/src/java.base/share/classes/java/util/concurrent/AbstractExecutorService.java	2020-07-23 15:02:54.050574191 -0700
+++ new/src/java.base/share/classes/java/util/concurrent/AbstractExecutorService.java	2020-07-23 15:02:53.690574191 -0700
@@ -77,6 +77,11 @@
 public abstract class AbstractExecutorService implements ExecutorService {
 
     /**
+     * Constructor for subclasses to call.
+     */
+    public AbstractExecutorService() {}
+
+    /**
      * Returns a {@code RunnableFuture} for the given runnable and default
      * value.
      *