String fileName = "upload_" + uid + "_" + getUniqueId() + ".tmp";
String fileName = "upload_" + UID + "_" + getUniqueId() + ".tmp";
    protected File getTempFile() {        File tempDir = repository;        if (tempDir == null) {            tempDir = new File(System.getProperty("java.io.tmpdir"));        }        String fileName = "upload_" + uid + "_" + getUniqueId() + ".tmp";        File f = new File(tempDir, fileName);        FileCleaner.track(f, this);        return f;    }