code: public static SslContextBuilder forServer(PrivateKey key, X509Certificate... keyCertChain) {
          return new SslContextBuilder(true).keyManager(key, keyCertChain);
      }
docs: Creates a builder for new server-side {@link SslContext}.
  
  @param key a PKCS#8 private key
  @param keyCertChain the X.509 certificate chain
  @see #keyManager(PrivateKey, X509Certificate[])