8250857: Address reliance on default constructors in the Java Beans API

Reviewed-by: prr

src/java.desktop/share/classes/java/beans/Beans.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1996, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1996, 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
@@ -59,6 +59,11 @@ import java.util.Vector;
 
 public class Beans {
 
+    /**
+     * Constructs a {@code Beans}.
+     */
+    public Beans() {}
+
     /**
      * <p>
      * Instantiate a JavaBean.

src/java.desktop/share/classes/java/beans/Encoder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 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
@@ -52,6 +52,11 @@ public class Encoder {
     boolean executeStatements = true;
     private Map<Object, Object> attributes;
 
+    /**
+     * Constructs an {@code Encoder}.
+     */
+    public Encoder() {}
+
     /**
      * Write the specified object to the output stream.
      * The serialized form will denote a series of

src/java.desktop/share/classes/java/beans/PersistenceDelegate.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 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
@@ -87,6 +87,11 @@ package java.beans;
 
 public abstract class PersistenceDelegate {
 
+    /**
+     * Constructs a {@code PersistenceDelegate}.
+     */
+    protected PersistenceDelegate() {}
+
     /**
      * The {@code writeObject} is a single entry point to the persistence
      * and is used by an {@code Encoder} in the traditional

src/java.desktop/share/classes/java/beans/PropertyEditorManager.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1996, 2011, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1996, 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
@@ -54,6 +54,11 @@ package java.beans;
 
 public class PropertyEditorManager {
 
+    /**
+     * Constructs a {@code PropertyEditorManager}.
+     */
+    public PropertyEditorManager() {}
+
     /**
      * Registers an editor class to edit values of the given target class.
      * If the editor class is {@code null},

src/java.desktop/share/classes/java/beans/SimpleBeanInfo.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1996, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1996, 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 @@ import java.security.PrivilegedAction;
  */
 public class SimpleBeanInfo implements BeanInfo {
 
+    /**
+     * Constructs a {@code SimpleBeanInfo}.
+     */
+    public SimpleBeanInfo() {}
+
     /**
      * Deny knowledge about the class and customizer of the bean.
      * You can override this if you wish to provide explicit info.