how to write java client and server applications that uses mutual ssl authentication between them?

Question

I\'m building two java applications which have to communicate using SSL two way authentication, I used instructions from here to create client and server certificates.
then

Answer 1

For anyone looking to implement 2 way mutual auth, following code worked perfectly for me.

    FileInputStream keystoreInputStream = null;
    FileInputStream truststoreInputStream = null;
    try {

        KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType());
        keystoreInputStream = new FileInputStream("C:\\Users\\Aman\\STSProj\\AppSecurity\\clientkeystore.p12");
        keystore.load(keystoreInputStream, "client".toCharArray());

        keystoreInputStream.close();

        KeyStore trustore = KeyStore.getInstance(KeyStore.getDefaultType());
        truststoreInputStream = new FileInputStream("C:\\Users\\Aman\\STSProj\\AppSecurity\\clienttruststore.p12");
        trustore.load(truststoreInputStream, "client".toCharArray());

        SSLContext sslcontext = SSLContexts.custom().useProtocol("TLS")
                .loadKeyMaterial(keystore, "client".toCharArray())
                .loadTrustMaterial(trustore, null).build();

        HostnameVerifier hostnameverifier = null;

        SSLConnectionSocketFactory sslSocketFactory = new SSLConnectionSocketFactory(sslcontext,
                null, null, hostnameverifier);

        CloseableHttpClient httpClient = HttpClients.custom().setSSLSocketFactory(sslSocketFactory).build();

        HttpsURLConnection.setDefaultSSLSocketFactory(sslcontext.getSocketFactory());
        HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory();

        requestFactory.setHttpClient(httpClient);

        RestTemplate restTemp = new RestTemplate(requestFactory);

        String greetings = restTemp
                .getForObject("https://localhost:8443/SecureAppServer/test/security/hello/aman123", String.class);

        System.out.println("Received greetings from secured server ---> " + greetings);

    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    finally {
        if (keystoreInputStream != null) {
            try {
                keystoreInputStream.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        if (truststoreInputStream != null) {
            try {
                truststoreInputStream.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

    }