@Override
    public void clear() {
        // no-op; we don't want to clear the components cache
    }
This specialized wrapper is used for the Components cache, which
should not be purged.

See <a href="https://igniterealtime.atlassian.net/browse/OF-114">OF-114</a> for more info.
xmppserver/src/main/java/org/jivesoftware/util/cache/ComponentCacheWrapper.java