Summary

Add explicit constructors to some classes in Java Beans APIs which using default constructors.

Problem

Default constructors are not recommended for formal API classes.

Solution

Add the public constructors to the public/non-abstract classes, and protected constructors to the public/abstract classes.

Specification

src/java.desktop/share/classes/java/beans/Beans.java
    public class Beans {

+    /**
+     * Constructs a {@code Beans}.
+     */
+    public Beans() {}

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

+    /**
+     * Constructs an {@code Encoder}.
+     */
+    public Encoder() {}

src/java.desktop/share/classes/java/beans/PersistenceDelegate.java
    public abstract class PersistenceDelegate {

+    /**
+     * Constructs a {@code PersistenceDelegate}.
+     */
+    protected PersistenceDelegate() {}

src/java.desktop/share/classes/java/beans/PropertyEditorManager.java
    public class PropertyEditorManager {

+    /**
+     * Constructs a {@code PropertyEditorManager}.
+     */
+    public PropertyEditorManager() {}

src/java.desktop/share/classes/java/beans/SimpleBeanInfo.java   
    public class SimpleBeanInfo implements BeanInfo {

+    /**
+     * Constructs a {@code SimpleBeanInfo}.
+     */
+    public SimpleBeanInfo() {}

Link for convenience: http://cr.openjdk.java.net/~serb/8250857/webrev.00