public Date getExpire() {
        return expire;
    }
Returns the Date at which a leased subscription will end or has ended. A value of
{@code null} means that the subscription will never expire.

@return the Date at which a leased subscription will end or has ended. A value of
        {@code null} means that the subscription will never expire.
xmppserver/src/main/java/org/jivesoftware/openfire/pubsub/NodeSubscription.java