code: private void createDbFolder(File dbDir) {
  		if (dbDir.exists()) {
  		    return;
  			//throw new JDOUserException("ZOO: Repository exists: " + dbFolder);
  		}
  		boolean r = dbDir.mkdirs();
  		if (!r) {
  			throw DBLogger.newUser("Could not create folders: " + dbDir.getAbsolutePath());
  		}
  	}
docs: Create a repository (directory/folder) to contain databases.