docs: private static KeyStore saveCertificateAsKeyStore(KeyStore existingKeyStore, boolean deleteOnExit, String keyStoreFileName, String certificationAlias, Key privateKey, char[] keyStorePassword, Certificate[] chain, X509Certificate caCert) {
          try {
              KeyStore keyStore = existingKeyStore;
              if (keyStore == null) {
                  // create new key store
                  keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
                  keyStore.load(null, keyStorePassword);
              }
  
              // add certificate
              try {
                  keyStore.deleteEntry(certificationAlias);
              } catch (KeyStoreException kse) {
                  // ignore as may not exist in keystore yet
              }
              keyStore.setKeyEntry(certificationAlias, privateKey, keyStorePassword, chain);
  
              // add CA certificate
              try {
                  keyStore.deleteEntry(KEY_STORE_CA_ALIAS);
              } catch (KeyStoreException kse) {
                  // ignore as may not exist in keystore yet
              }
              keyStore.setCertificateEntry(KEY_STORE_CA_ALIAS, caCert);
  
              // save as JKS file
              String keyStoreFileAbsolutePath = new File(keyStoreFileName).getAbsolutePath();
              try (FileOutputStream fileOutputStream = new FileOutputStream(keyStoreFileAbsolutePath)) {
                  keyStore.store(fileOutputStream, keyStorePassword);
                  MOCK_SERVER_LOGGER.trace("Saving key store to file [" + keyStoreFileAbsolutePath + "]");
              }
              if (deleteOnExit) {
                  new File(keyStoreFileAbsolutePath).deleteOnExit();
              }
              return keyStore;
          } catch (Exception e) {
              throw new RuntimeException("Exception while saving KeyStore", e);
          }
      }