java mutual authentification

            // -- keystore
            KeyStore ks = KeyStore.getInstance("PKCS12");
            ks.load(new FileInputStream(KEYSTORE), KEYSTORE_PASS.toCharArray());
            KeyManagerFactory kmf = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
            kmf.init(ks, KEYSTORE_PASS.toCharArray());

            // -- trustore
            KeyStore ts = KeyStore.getInstance("JKS");
            ts.load(new FileInputStream(TRUSTORE), TRUSTORE_PASS.toCharArray());
            TrustManagerFactory tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
            tmf.init(ts);

            // -- kontext
            SSLContext sslContext = SSLContext.getInstance("TLSv1");
            sslContext.init(kmf.getKeyManagers(), tmf.getTrustManagers(), new java.security.SecureRandom());

            // -- factory
            SSLSocketFactory factory = sslContext.getSocketFactory();
            SSLSocket sslSocket = (SSLSocket) factory.createSocket(HOST, PORT);
            sslSocket.startHandshake();

            // -- connection
            HttpsURLConnection connection = (HttpsURLConnection) new URL(ENDPOINT).openConnection();
            connection.setRequestMethod("GET");
            connection.setRequestProperty("Content-Type", "application/xml");
            connection.setRequestProperty("Content-Language", "en-US");
            connection.setSSLSocketFactory(factory);

            // -- processing request/response
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String line;
            StringBuilder lines = new StringBuilder();
            while ((line = bufferedReader.readLine()) != null) {
                lines.append(line).append(LINE_BREAKER);
            }
            System.out.println("response from " + HOST + ":" + LINE_BREAKER + lines);