ption indicating that the result of a value-producing task cannot be
 retrieved because the task run was skipped.</div>
</div>
<div class="col-first odd-row-color class-summary class-summary-tab1"><a href="Trigger.html" title="interface in jakarta.enterprise.concurrent">Trigger</a></div>
<div class="col-last odd-row-color class-summary class-summary-tab1">
<div class="block">Triggers allow application developers to plug in rules for when
 and how often a task should run.</div>
</div>
<div class="col-first e