SOAPConnection uses HttpsURLConnectionOldImpl

[LanceAndersen]

This issue was previously tracked via: https://bugs.openjdk.java.net/browse/JDK-8186070

FULL PRODUCT VERSION :
java version "1.8.0_131"
Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
macOS Sierra v. 10.12.4
Darwin Mac-mini-de-Oscar.local 16.5.0 Darwin Kernel Version 16.5.0: Fri Mar 3 16:52:33 PST 2017; root:xnu-3789.51.2~3/RELEASE_X86_64 x86_64

A DESCRIPTION OF THE PROBLEM :
If you need your HTTPS connection to authenticate with a client certificate, it is necessary to define a URLStreamHandler. Then, after calling openConnection you must set a SSLSocketFactory. This socket factory must use a KeyManager object with the client certificate.
So, it is necessary to cast to HttpsURLConnection, and then, a ClassCastException is thrown.

...
URL endpoint = new URL(null, url.toString(), new URLStreamHandler()
{@OverRide protected URLConnection openConnection(URL url) throws IOException
{
URL cloneURL = new URL(url.toString());
HttpsURLConnection urlCon = (HttpsURLConnection)cloneURL.openConnection();
urlCon.setSSLSocketFactory(getMySocketFactory());
return urlCon;
}});
...

SSLSocketFactory getMyFactory() throws...
{
KeyStore keyStore = KeyStore.getInstance("PKCS12");
InputStream keyInput = new FileInputStream(new File(keyFile));
keyStore.load(keyInput, keyPassword.toCharArray());
keyInput.close();

    KeyManagerFactory kmf = KeyManagerFactory.getInstance( 
                            KeyManagerFactory.getDefaultAlgorithm()); 

    kmf.init(keyStore, keyPassword.toCharArray()); 
    SSLContext context = SSLContext.getInstance("TLS"); 
    context.init(kmf.getKeyManagers(), null, null); 
    return context.getSocketFactory(); 

}

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Execute the test case.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
If you apply the workaround, the test executes silently.
ACTUAL -
class com.sun.net.ssl.internal.www.protocol.https.HttpsURLConnectionOldImpl cannot be cast to javax.net.ssl.HttpsURLConnection

ERROR MESSAGES/STACK TRACES THAT OCCUR :
class com.sun.net.ssl.internal.www.protocol.https.HttpsURLConnectionOldImpl cannot be cast to javax.net.ssl.HttpsURLConnection

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public class Test
{
public static void main(String args[]) throws Exception
{
String sURL = "https://www.google.es";

// If you uncomment the following line, urlCon is HttpsURLConnection. 
//URL url = new URL(sURL); 

// I redirect standard error output to null, because 
// I'm only interested in HttpsURLConnection error. 
System.setErr(new PrintStream(new OutputStream() { 
              @Override public void write(int b) {}})); 

URL endpoint = new URL(null, sURL, new URLStreamHandler() 
{@Override protected URLConnection openConnection(URL url) 
    throws IOException 
{ 
    URL urlClone = new URL(url.toString()); 
    URLConnection urlCon = urlClone.openConnection(); 

    if(!(urlCon instanceof HttpsURLConnection)) 
    { 
        System.out.println(urlCon.getClass() +" cannot be cast "+ 
                           "to javax.net.ssl.HttpsURLConnection"); 
        System.exit(0); 
    } 

    // Here I could define a custom SSLSocketFactory in 
    // order to define a client certificate authentication. 
    // So I would need to cast to HttpsURLConnection. 
    return urlCon; 
}}); 

// The SOAP call is wrong, but it is used to check if 
// the URLConnection is instance of HttpsURLConnection. 
SOAPMessage msg = MessageFactory.newInstance().createMessage(); 
SOAPConnection con = SOAPConnectionFactory.newInstance().createConnection(); 
con.call(msg, endpoint); 
con.close(); 

}

} // Test

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Uncomment the line:

URL url = new URL(sURL); 

This workaround means that there is a collateral effect when creating a URL object.