code: @Override
      public AS_ContextSec encodeIOR(Codec codec) throws Exception {
          AS_ContextSec result = new AS_ContextSec();
  
          result.target_supports = 0;
          result.target_requires = 0;
          result.client_authentication_mech = Util.encodeOID(NULL_OID);
          result.target_name = Util.encodeGSSExportName(NULL_OID, "");
  
          return result;
      }
docs: This method should not be invoked, but just in case that is not the case,
  return null OID.
  
  @param orb
  @param codec
  @return
  @throws Exception