trigger that determines when the task should fire.</dd>
<dt>Returns:</dt>
<dd>a ScheduledFuture that can be used to extract result or cancel.</dd>
<dt>Throws:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/concurrent/RejectedExecutionException.html" title="class or interface in java.util.concurrent" class="external-link">RejectedExecutionException</a></code> - if task cannot be scheduled for execution.</dd>
<dd><code><a href="https://docs.oracle.com/en/java/ja