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    <p>You could do this using JSTL tags, but the result is not optimal:</p> <pre><code>&lt;%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%&gt; &lt;html&gt; &lt;body&gt; &lt;jsp:useBean id="numbers" class="java.util.HashSet" scope="request"&gt; &lt;% numbers.add("one"); numbers.add("two"); numbers.add("three"); %&gt; &lt;/jsp:useBean&gt; &lt;c:forEach items="${numbers}" var="value"&gt; &lt;c:if test="${value == 'two'}"&gt; &lt;c:set var="found" value="true" scope="request" /&gt; &lt;/c:if&gt; &lt;/c:forEach&gt; ${found} &lt;/body&gt; &lt;/html&gt; </code></pre> <hr> <p>A better way would be to use a custom function:</p> <pre><code>package my.package; public class Util { public static boolean contains(Collection&lt;?&gt; coll, Object o) { if (coll == null) return false; return coll.contains(o); } } </code></pre> <p>This is defined in a TLD file <em>ROOT</em>/WEB-INF/tag/custom.tld:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;taglib xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2_1.xsd" version="2.1"&gt; &lt;tlib-version&gt;1.0&lt;/tlib-version&gt; &lt;short-name&gt;myfn&lt;/short-name&gt; &lt;uri&gt;http://samplefn&lt;/uri&gt; &lt;function&gt; &lt;name&gt;contains&lt;/name&gt; &lt;function-class&gt;my.package.Util&lt;/function-class&gt; &lt;function-signature&gt;boolean contains(java.util.Collection, java.lang.Object)&lt;/function-signature&gt; &lt;/function&gt; &lt;/taglib&gt; </code></pre> <p>The function can then be imported into your JSPs:</p> <pre><code>&lt;%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%&gt; &lt;%@ taglib prefix="myfn" uri="http://samplefn"%&gt; &lt;html&gt; &lt;body&gt; &lt;jsp:useBean id="numbers" class="java.util.HashSet" scope="request"&gt; &lt;% numbers.add("one"); numbers.add("two"); numbers.add("three"); %&gt; &lt;/jsp:useBean&gt; ${myfn:contains(numbers, 'one')} ${myfn:contains(numbers, 'zero')} &lt;/body&gt; &lt;/html&gt; </code></pre> <hr> <p>The next version of EL (due in JEE6) should allow the more direct form:</p> <pre><code>${numbers.contains('two')} </code></pre>
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    1. CO+1 for using the custom function. It's the right way to go and reusable :)
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