8250859: Address reliance on default constructors in the Accessibility APIs

Reviewed-by: prr

src/java.desktop/share/classes/javax/accessibility/AccessibleContext.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -79,6 +79,11 @@ import sun.awt.AppContext;
 @JavaBean(description = "Minimal information that all accessible objects return")
 public abstract class AccessibleContext {
 
+    /**
+     * Constructor for subclasses to call.
+     */
+    protected AccessibleContext() {}
+
     /**
      * The {@code AppContext} that should be used to dispatch events for this
      * {@code AccessibleContext}.

src/java.desktop/share/classes/javax/accessibility/AccessibleHyperlink.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1998, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2020, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -38,6 +38,11 @@ package javax.accessibility;
  */
 public abstract class AccessibleHyperlink implements AccessibleAction {
 
+    /**
+     * Constructor for subclasses to call.
+     */
+    protected AccessibleHyperlink() {}
+
     /**
      * Since the document a link is associated with may have changed, this
      * method returns whether or not this Link is still valid (with respect to

src/java.desktop/share/classes/javax/accessibility/AccessibleResourceBundle.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -38,6 +38,11 @@ import java.util.ListResourceBundle;
 @Deprecated
 public class AccessibleResourceBundle extends ListResourceBundle {
 
+    /**
+     * Constructs an {@code AccessibleResourceBundle}.
+     */
+    public AccessibleResourceBundle() {}
+
     /**
      * Returns the mapping between the programmatic keys and the localized
      * display strings.

src/jdk.accessibility/share/classes/com/sun/java/accessibility/util/AWTEventMonitor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2002, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2002, 2020, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -45,6 +45,11 @@ import sun.awt.AWTPermissions;
 
 public class AWTEventMonitor {
 
+    /**
+     * Constructs an {@code AWTEventMonitor}.
+     */
+    public AWTEventMonitor() {}
+
     /**
      * The current component with keyboard focus.
      *

src/jdk.accessibility/share/classes/com/sun/java/accessibility/util/AccessibilityEventMonitor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2002, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2002, 2020, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -45,6 +45,11 @@ import javax.accessibility.*;
 
 public class AccessibilityEventMonitor {
 
+    /**
+     * Constructs an {@code AccessibilityEventMonitor}.
+     */
+    public AccessibilityEventMonitor() {}
+
     // listeners
     /**
      * The current list of registered {@link java.beans.PropertyChangeListener

src/jdk.accessibility/share/classes/com/sun/java/accessibility/util/AccessibilityListenerList.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2005, 2020, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -46,6 +46,11 @@ public class AccessibilityListenerList {
      */
     protected transient Object[] listenerList = NULL_ARRAY;
 
+    /**
+     * Constructs an {@code AccessibilityListenerList}.
+     */
+    public AccessibilityListenerList() {}
+
     /**
      * Passes back the event listener list as an array of listener type, listener pairs.
      * Note that for performance reasons, this implementation passes back the actual

src/jdk.accessibility/share/classes/com/sun/java/accessibility/util/EventID.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2002, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2002, 2020, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -37,6 +37,11 @@ package com.sun.java.accessibility.util;
  */
 public class EventID {
 
+    /**
+     * Constructs an {@code EventID}.
+     */
+    public EventID() {}
+
     /**
      * Maps to AWT Action support (i.e., ActionListener and ActionEvent)
      */

src/jdk.accessibility/share/classes/com/sun/java/accessibility/util/SwingEventMonitor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2002, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2002, 2020, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -58,6 +58,10 @@ import javax.accessibility.*;
  */
 public class SwingEventMonitor extends AWTEventMonitor {
 
+    /**
+     * Constructs a {@code SwingEventMonitor}.
+     */
+
     /**
      * The master list of all listeners registered by other classes.
      * This can only be publicly modified by calling the add or