StringBuilder sb = new StringBuilder();
sb.append("/forum/");
sb.append(forumKey);
sb.append("/");
String pathToForumDir = sb.toString();
OlatRootFolderImpl forumContainer = new OlatRootFolderImpl(pathToForumDir, null);
File baseFile = forumContainer.getBasefile();
baseFile.mkdirs();
return forumContainer;
}