--- old/src/jdk.compiler/share/classes/com/sun/source/util/JavacTask.java	2020-07-23 09:48:40.873559937 -0700
+++ new/src/jdk.compiler/share/classes/com/sun/source/util/JavacTask.java	2020-07-23 09:48:40.441775922 -0700
@@ -50,6 +50,10 @@
  * @since 1.6
  */
 public abstract class JavacTask implements CompilationTask {
+    /**
+     * Constructor for subclasses to call.
+     */
+    public JavacTask() {}
 
     /**
      * Returns the {@code JavacTask} for a {@code ProcessingEnvironment}.