Polling in this way is generally not recommended since there is no centralized management of when messages are sent to the server. Furthermore, polling might not be needed at all if {@link UI#setPushMode(PushMode)} or{@link UI#setPollInterval(int)} is used. @author Vaadin Ltd. @since 4 @deprecated as of 7.1, use {@link ProgressBar} combined with{@link UI#setPushMode(PushMode)} or{@link UI#setPollInterval(int)} instead.
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