}
@VisibleForTesting
static FileSystemManager createFileSystemManager(LocalFileProvider localFileProvider) throws FileSystemException {
try {
FastJarFileProvider jarFileProvider = new FastJarFileProvider();
// this provides a fake local file system rooted in the servlet context root.
// this is necessary because on the actual appengine platform, any queries to the ancestors
// of the servlet context (e.g. /base) will throw a security exception