sk cannot be scheduled for execution.</dd>
<dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/NullPointerException.html" title="class or interface in java.lang" class="external-link">NullPointerException</a></code> - if command is null.</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="schedule(java.util.concurrent.Callable,jakarta.enterprise.concurrent.Trigger)">
<h3>schedule</h3>
<div class="member-signature"><span class="type-parameters">&lt;V&gt;</span>&