TLSChecker

import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;
import java.net.URL;
import java.net.UnknownHostException;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;

public final class TLSChecker {
    public static void main(String[] args) throws Exception {
        final TracingSocketFactory socketFactory = new TracingSocketFactory();
        HttpsURLConnection.setDefaultSSLSocketFactory(socketFactory);

        final URL address = new URL(args[0]);
        final HttpsURLConnection connection = (HttpsURLConnection) address.openConnection();
        connection.connect();


        final Collection<Socket> createdSockets = socketFactory.getCreatedSockets();
        for (Socket socket : createdSockets) {
            if (socket instanceof SSLSocket) {
                final SSLSocket sslSocket = (SSLSocket) socket;
                System.out.println("SSL Socket: " + sslSocket);
                System.out.println("Selected Protocol: " + sslSocket.getSession().getProtocol());
                System.out.println("Selected CipherSuite: " + sslSocket.getSession().getCipherSuite());
            }
        }
    }
}

class TracingSocketFactory extends SSLSocketFactory {
    private final SSLSocketFactory delegate;
    private final Collection<Socket> createdSockets;

    public TracingSocketFactory() throws NoSuchAlgorithmException, KeyManagementException {
        delegate = (SSLSocketFactory) SSLSocketFactory.getDefault();
//        SSLContext sslContext = SSLContext.getInstance("TLSv1");
//        sslContext.init(null, null, null);
//        delegate = sslContext.getSocketFactory();
        createdSockets = new ArrayList<>();

        System.out.println("Default enabled protocols: " + Arrays.toString(SSLContext.getDefault().getDefaultSSLParameters().getProtocols()));
    }

    @Override
    public String[] getDefaultCipherSuites() {
        return delegate.getDefaultCipherSuites();
    }

    @Override
    public String[] getSupportedCipherSuites() {
        return delegate.getSupportedCipherSuites();
    }

    @Override
    public Socket createSocket(Socket s, String host, int port, boolean autoClose) throws IOException {
        final Socket socket = delegate.createSocket(s, host, port, autoClose);
        createdSockets.add(socket);
        return socket;
    }

    @Override
    public Socket createSocket() throws IOException {
        final Socket socket = delegate.createSocket();
        createdSockets.add(socket);
        return socket;
    }

    @Override
    public Socket createSocket(String host, int port) throws IOException, UnknownHostException {
        final Socket socket = delegate.createSocket(host, port);
        createdSockets.add(socket);
        return socket;
    }

    @Override
    public Socket createSocket(String host, int port, InetAddress localHost, int localPort) throws IOException, UnknownHostException {
        final Socket socket = delegate.createSocket(host, port, localHost, localPort);
        createdSockets.add(socket);
        return socket;
    }

    @Override
    public Socket createSocket(InetAddress host, int port) throws IOException {
        final Socket socket = delegate.createSocket(host, port);
        createdSockets.add(socket);
        return socket;
    }

    @Override
    public Socket createSocket(InetAddress address, int port, InetAddress localAddress, int localPort) throws IOException {
        final Socket socket = delegate.createSocket(address, port, localAddress, localPort);
        createdSockets.add(socket);
        return socket;
    }

    public Collection<Socket> getCreatedSockets() {
        return createdSockets;
    }
}