code: public void initRegistryEntry(String groupName, String entryName) throws RepositoryException,
        RepositoryConfigurationException
     {
  
        String relPath = EXO_REGISTRY + "/" + groupName + "/" + entryName;
        for (RepositoryEntry repConfiguration : repConfigurations())
        {
           String repName = repConfiguration.getName();
           SessionProvider sysProvider = SessionProvider.createSystemProvider();
           Node root = session(sysProvider, repositoryService.getRepository(repName)).getRootNode();
           if (!root.hasNode(relPath))
           {
              root.addNode(relPath, EXO_REGISTRYENTRY_NT);
              root.save();
           }
           else
           {
              LOG.info("The RegistryEntry " + relPath + "is already initialized on repository " + repName);
           }
           sysProvider.close();
        }
     }
docs: Initializes the registry entry
  @param groupName the group entry name
  @param entryName the entry name
  @throws RepositoryConfigurationException if a configuration issue occurs
  @throws RepositoryException if any error occurs