s or interface in java.lang">NullPointerException</a></code> - if the supplied value list is <code>null</code>.</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.0</dd>
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<h4>addFirst</h4>
<pre>void&nbsp;addFirst(<a href="../../../../jakarta/ws/rs/core/MultivaluedMap.html" title="type parameter in MultivaluedMap">K</a>&nbsp;