8247374: Remove default constructors from javax.net.sslK

Reviewed-by: xuelei

src/java.base/share/classes/javax/net/ssl/ExtendedSSLSession.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2010, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2010, 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
@@ -34,6 +34,11 @@ import java.util.List;
  * @since 1.7
  */
 public abstract class ExtendedSSLSession implements SSLSession {
+    /**
+     * Constructor for subclasses to call.
+     */
+    public ExtendedSSLSession() {}
+
     /**
      * Obtains an array of supported signature algorithms that the local side
      * is willing to use.

src/java.base/share/classes/javax/net/ssl/KeyManagerFactorySpi.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2001, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 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
@@ -40,6 +40,11 @@ import java.security.*;
  * @see KeyManager
  */
 public abstract class KeyManagerFactorySpi {
+    /**
+     * Constructor for subclasses to call.
+     */
+    public KeyManagerFactorySpi() {}
+
     /**
      * Initializes this factory with a source of key material.
      *

src/java.base/share/classes/javax/net/ssl/SSLContextSpi.java

@@ -39,6 +39,11 @@ import java.security.*;
  * @see SSLContext
  */
 public abstract class SSLContextSpi {
+    /**
+     * Constructor for subclasses to call.
+     */
+    public SSLContextSpi() {}
+
     /**
      * Initializes this context.
      *

src/java.base/share/classes/javax/net/ssl/TrustManagerFactorySpi.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2008, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 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
@@ -40,6 +40,11 @@ import java.security.*;
  * @see TrustManager
  */
 public abstract class TrustManagerFactorySpi {
+    /**
+     * Constructor for subclasses to call.
+     */
+    public TrustManagerFactorySpi() {}
+
     /**
      * Initializes this factory with a source of certificate
      * authorities and related trust material.

src/java.base/share/classes/javax/net/ssl/X509ExtendedTrustManager.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2010, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2010, 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 @@ import java.security.cert.CertificateException;
  * @since 1.7
  */
 public abstract class X509ExtendedTrustManager implements X509TrustManager {
+    /**
+     * Constructor for subclasses to call.
+     */
+    public X509ExtendedTrustManager() {}
+
     /**
      * Given the partial or complete certificate chain provided by the
      * peer, build and validate the certificate path based on the