KeyStore keyStore = KeyStore.getInstance("HDImageStore");
keyStore.load(null, null);

KeyManagerFactory kmf = KeyManagerFactory.getInstance("GostX509");
kmf.init(keyStore, container_password);

KeyStore trustStore = KeyStore.getInstance("CertStore");
trustStore.load(new FileInputStream(trustStorePath), trust_store_password);

TrustManagerFactory tmf = TrustManagerFactory.getInstance("GostX509");
tmf.init(trustStore);
 
SSLContext sslCtx = SSLContext.getInstance("GostTLS");
sslCtx.init(kmf.getKeyManagers(), tmf.getTrustManagers(), null);

SSLSocketFactory sslSocketFactory = sslCtx.getSocketFactory();
URL url = new URL(...);

HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();
connection.setSSLSocketFactory(sslSocketFactory);

...
connection.disconnect();