Jakarta Expression Language function in the local function mapper.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/el/ELProcessor.html#defineFunction-java.lang.String-java.lang.String-java.lang.String-java.lang.String-">defineFunction</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp