@Deprecated // Unused Interface Method. Will be removed.
  default int getVersion() {
    throw new UnsupportedOperationException();
  }
Returns the version number of this KeyManager.

<p>This method is not used by Tink anymore. It does not need to be implemented.
@deprecated Do not use it.
java_src/src/main/java/com/google/crypto/tink/KeyManager.java