Summary

Add explicit no-arg constructors to several abstract classes in javax.net.ssl which implicitly use default constructors.

Problem

Use of default constructors is not recommended for formal classes.

Solution

Add explicit constructors.

Specification

diff -r d9daa4ce8017 src/java.base/share/classes/javax/net/ssl/ExtendedSSLSession.java
--- a/src/java.base/share/classes/javax/net/ssl/ExtendedSSLSession.java    Wed Jun 10 13:29:44 2020 -0700
+++ b/src/java.base/share/classes/javax/net/ssl/ExtendedSSLSession.java    Wed Jun 10 15:56:57 2020 -0700
@@ -35,6 +35,11 @@
  */
 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.
      * <p>
diff -r d9daa4ce8017 src/java.base/share/classes/javax/net/ssl/KeyManagerFactorySpi.java
--- a/src/java.base/share/classes/javax/net/ssl/KeyManagerFactorySpi.java    Wed Jun 10 13:29:44 2020 -0700
+++ b/src/java.base/share/classes/javax/net/ssl/KeyManagerFactorySpi.java    Wed Jun 10 15:56:57 2020 -0700
@@ -41,6 +41,11 @@
  */
 public abstract class KeyManagerFactorySpi {
     /**
+     * Constructor for subclasses to call.
+     */
+    public KeyManagerFactorySpi() {}
+
+    /**
      * Initializes this factory with a source of key material.
      *
      * @param ks the key store or null
diff -r d9daa4ce8017 src/java.base/share/classes/javax/net/ssl/SSLContextSpi.java
--- a/src/java.base/share/classes/javax/net/ssl/SSLContextSpi.java    Wed Jun 10 13:29:44 2020 -0700
+++ b/src/java.base/share/classes/javax/net/ssl/SSLContextSpi.java    Wed Jun 10 15:56:57 2020 -0700
@@ -40,6 +40,11 @@
  */
 public abstract class SSLContextSpi {
     /**
+     * Constructor for subclasses to call.
+     */
+    public SSLContextSpi() {}
+
+    /**
      * Initializes this context.
      *
      * @param km the sources of authentication keys
diff -r d9daa4ce8017 src/java.base/share/classes/javax/net/ssl/TrustManagerFactorySpi.java
--- a/src/java.base/share/classes/javax/net/ssl/TrustManagerFactorySpi.java    Wed Jun 10 13:29:44 2020 -0700
+++ b/src/java.base/share/classes/javax/net/ssl/TrustManagerFactorySpi.java    Wed Jun 10 15:56:57 2020 -0700
@@ -41,6 +41,11 @@
  */
 public abstract class TrustManagerFactorySpi {
     /**
+     * Constructor for subclasses to call.
+     */
+    public TrustManagerFactorySpi() {}
+
+    /**
      * Initializes this factory with a source of certificate
      * authorities and related trust material.
      *
diff -r d9daa4ce8017 src/java.base/share/classes/javax/net/ssl/X509ExtendedTrustManager.java
--- a/src/java.base/share/classes/javax/net/ssl/X509ExtendedTrustManager.java    Wed Jun 10 13:29:44 2020 -0700
+++ b/src/java.base/share/classes/javax/net/ssl/X509ExtendedTrustManager.java    Wed Jun 10 15:56:57 2020 -0700
@@ -55,6 +55,11 @@
  */
 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
      * authentication type and ssl parameters.