code: private void fixKeyManagers() {
          // If the key manager factory is null, do not continue
          if (null == keyManagerFactory || null == keyManagerFactory.getKeyManagers()) {
              return;
          }
          KeyManager[] defaultKeyManagers = keyManagerFactory.getKeyManagers();
          KeyManager[] newKeyManagers = new KeyManager[defaultKeyManagers.length];
  
          KeyManager mgr = null;
          for (int i = 0; i < defaultKeyManagers.length; i++) {
              mgr = defaultKeyManagers[i];
              // If we're looking at an X509 Key manager, then wrap it in our
              // alias-selective manager
              if (mgr instanceof X509KeyManager) {
                  mgr = new AliasSensitiveX509KeyManager(this, (X509KeyManager) mgr);
              }
              newKeyManagers[i] = mgr;
          }
  
          keyManagers = newKeyManagers;
      }
docs: If a keystore alias is defined, then override the key manager assigned
  to with an alias-sensitive wrapper that selects the proper key from your
  assigned key alias.