--- old/src/java.base/share/classes/java/util/concurrent/RecursiveAction.java	2020-07-23 15:02:55.422574191 -0700
+++ new/src/java.base/share/classes/java/util/concurrent/RecursiveAction.java	2020-07-23 15:02:55.062574191 -0700
@@ -166,6 +166,11 @@
     private static final long serialVersionUID = 5232453952276485070L;
 
     /**
+     * Constructor for subclasses to call.
+     */
+    public RecursiveAction() {}
+
+    /**
      * The main computation performed by this task.
      */
     protected abstract void compute();