How to use SSL Client certificate with Apache commons http client

My application is using Apache Commons HTTP Client to consume HTTP service URL. Now we have to move over HTTPS endpoint URL. To consume the same, we received SSL Client Certificate. How we can use .JKS with password while consuming HTTPS URL ? (Due to application limitations cant use other APIs)

KeyStore identityKeyStore = KeyStore.getInstance("JKS");
FileInputStream identityKeyStoreFile = new FileInputStream(new File(certificatePath));
identityKeyStore.load(identityKeyStoreFile, password.toCharArray());
TrustManagerFactory tmf = TrustManagerFactory.getInstance("SunX509");
tmf.init(identityKeyStore);
KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance("SunX509");
keyManagerFactory.init(identityKeyStore, password.toCharArray());
SSLContext sslContext = SSLContext.getInstance("SSL");
sslContext.init(keyManagerFactory.getKeyManagers(), tmf.getTrustManagers(), null);
SSLContext.setDefault(sslContext);        
PostMethod post = new PostMethod("https://url");
    HttpClient httpClient = new HttpClient();
    String reqMessage = getSolaceRequestMessage(message,hostName,port,authentication);
    Part[] parts = {
        new StringPart("reqMessage", message),
    };
    post.setRequestEntity(
        new MultipartRequestEntity(parts, post.getParams())
    );
    httpClient.executeMethod(post);

I used below implementation which worked for me as had limitation not to upgrade the http client libraries.

System.setProperty(JAVAX_NET_SSL_TRUSTSTORE, "H://certificateFile.jks");
System.setProperty(JAVAX_NET_SSL_TRUSTSTORE_KEY, "abcd");