8213210: Change ServerSocket(SocketImpl impl) constructor to protected access

[Brian Burkhalter]

> On Oct 31, 2018, at 12:20 PM, Brian Burkhalter <brian.burkhalter at oracle.com> wrote:
> 
> -    ServerSocket(SocketImpl impl) {
> +    protected ServerSocket(SocketImpl impl) {
>          this.impl = impl;
>          impl.setServerSocket(this); // <- NPE if impl == null
>      }

Oops, it can throw null as indicated above. Revised patch below.

Brian

--- a/src/java.base/share/classes/java/net/ServerSocket.java
+++ b/src/java.base/share/classes/java/net/ServerSocket.java
@@ -76,10 +76,16 @@
     private boolean oldImpl = false;
 
     /**
-     * Package-private constructor to create a ServerSocket associated with
-     * the given SocketImpl.
+     * Creates a server socket with a user-specified {@code SocketImpl}.
+     *
+     * @param      impl an instance of a SocketImpl the subclass
+     *             wishes to use on the ServerSocket.
+     *
+     * @throws     NullPointerException if impl is {@code null}
+     *
+     * @since 12
      */
-    ServerSocket(SocketImpl impl) {
+    protected ServerSocket(SocketImpl impl) {
         this.impl = impl;
         impl.setServerSocket(this);
     }
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