dicate to test whether the expression is not null.</div>
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<td class="colFirst"><code><a href="../../../../javax/persistence/criteria/Predicate.html" title="interface in javax.persistence.criteria">Predicate</a></code></td>
<td class="colLast"><span class="typeNameLabel">Expression.</span><code><span class="memberNameLink"><a href="../../../../javax/persistence/criteria/Expression.html#isNull--">isNull</a></span>()</code>
<div class="block">Create a predicate to test whether 