How to use

CsrfPreventionFilter$LruCache

in

org.apache.catalina.filters

      !nonceCache.contains(previousNonce)) {
    res.sendError(HttpServletResponse.SC_FORBIDDEN);
    return;
  nonceCache = new LruCache<String>(nonceCacheSize);
  if (session == null) {
    session = req.getSession(true);
nonceCache.add(newNonce);

      !nonceCache.contains(previousNonce)) {
    res.sendError(denyStatus);
    return;
  nonceCache = new LruCache<String>(nonceCacheSize);
  if (session == null) {
    session = req.getSession(true);
nonceCache.add(newNonce);

      || !nonceCache.contains(previousNonce)) {
    res.sendError(HttpServletResponse.SC_FORBIDDEN);
    return;
  nonceCache = new LruCache<String>(nonceCacheSize);
  if (session == null) {
    session = req.getSession(true);
nonceCache.add(newNonce);

      !nonceCache.contains(previousNonce)) {
    res.sendError(denyStatus);
    return;
  nonceCache = new LruCache<>(nonceCacheSize);
  if (session == null) {
    session = req.getSession(true);
nonceCache.add(newNonce);

    req.getParameter(Constants.CSRF_NONCE_REQUEST_PARAM);
  if (nonceCache != null && !nonceCache.contains(previousNonce)) {
    res.sendError(HttpServletResponse.SC_FORBIDDEN);
    return;
  nonceCache = new LruCache<String>(nonceCacheSize);
  req.getSession().setAttribute(
      Constants.CSRF_NONCE_SESSION_ATTR_NAME, nonceCache);
nonceCache.add(newNonce);

      !nonceCache.contains(previousNonce)) {
    res.sendError(getDenyStatus());
    return;
  nonceCache = new LruCache<>(nonceCacheSize);
  if (session == null) {
    session = req.getSession(true);
nonceCache.add(newNonce);

    req.getParameter(Constants.CSRF_NONCE_REQUEST_PARAM);
  if (nonceCache != null && !nonceCache.contains(previousNonce)) {
    res.sendError(HttpServletResponse.SC_FORBIDDEN);
    return;
  nonceCache = new LruCache<String>(nonceCacheSize);
  req.getSession().setAttribute(
      Constants.CSRF_NONCE_SESSION_ATTR_NAME, nonceCache);
nonceCache.add(newNonce);

    req.getParameter(Constants.CSRF_NONCE_REQUEST_PARAM);
  if (nonceCache != null && !nonceCache.contains(previousNonce)) {
    res.sendError(HttpServletResponse.SC_FORBIDDEN);
    return;
  nonceCache = new LruCache<String>(nonceCacheSize);
  req.getSession().setAttribute(
      Constants.CSRF_NONCE_SESSION_ATTR_NAME, nonceCache);
nonceCache.add(newNonce);

    req.getParameter(Constants.CSRF_NONCE_REQUEST_PARAM);
  if (nonceCache != null && !nonceCache.contains(previousNonce)) {
    res.sendError(HttpServletResponse.SC_FORBIDDEN);
    return;
  nonceCache = new LruCache<String>(nonceCacheSize);
  req.getSession().setAttribute(
      Constants.CSRF_NONCE_SESSION_ATTR_NAME, nonceCache);
nonceCache.add(newNonce);

      !nonceCache.contains(previousNonce)) {
    res.sendError(getDenyStatus());
    return;
  nonceCache = new LruCache<>(nonceCacheSize);
  if (session == null) {
    session = req.getSession(true);
nonceCache.add(newNonce);