code: public void addProvider(String urlScheme, FileProvider provider) throws FileSystemException
      {
          ((DefaultFileSystemManager)fileSystemManager).addProvider(urlScheme, provider);
      }
docs: For testing purpose of new VFS providers (eg. Confluence, ...)
  
  @param urlScheme a {@link java.lang.String} object.
  @param provider a {@link org.apache.commons.vfs.provider.FileProvider} object.
  @throws org.apache.commons.vfs.FileSystemException if any.