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    <p>First create a <code>final</code> class with a <code>public static</code> method which does exactly the job you want:</p> <pre class="lang-java prettyprint-override"><code>package com.example; import java.util.Collection; public final class Functions { private Functions() { // Hide constructor. } public static boolean contains(Collection&lt;Object&gt; collection, Object item) { return collection.contains(item); } } </code></pre> <p>Then define it as a <code>facelet-taglib</code> in <code>/WEB-INF/functions.taglib.xml</code>:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;facelet-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-facelettaglibrary_2_0.xsd" version="2.0"&gt; &lt;namespace&gt;http://example.com/functions&lt;/namespace&gt; &lt;function&gt; &lt;function-name&gt;contains&lt;/function-name&gt; &lt;function-class&gt;com.example.Functions&lt;/function-class&gt; &lt;function-signature&gt;boolean contains(java.util.Collection, java.lang.Object)&lt;/function-signature&gt; &lt;/function&gt; &lt;/facelet-taglib&gt; </code></pre> <p>Then familarize Facelets with the new taglib in the existing <code>/WEB-INF/web.xml</code>:</p> <pre><code>&lt;context-param&gt; &lt;param-name&gt;javax.faces.FACELETS_LIBRARIES&lt;/param-name&gt; &lt;param-value&gt;/WEB-INF/functions.taglib.xml&lt;/param-value&gt; &lt;/context-param&gt; </code></pre> <p><em>(note: if you already have the <code>javax.faces.FACELETS_LIBRARIES</code> definied, then you can just add the new path semicolon separated)</em></p> <p>Then define it in the Facelets XHTML file as new XML namespace:</p> <pre><code>&lt;html xmlns="http://www.w3.org/1999/xhtml" xmlns:f="http://java.sun.com/jsf/core" xmlns:h="http://java.sun.com/jsf/html" xmlns:func="http://example.com/functions" ... &gt; </code></pre> <p>Finally you can use it as intended:</p> <pre><code>rendered="#{func:contains(bean.panels, 'u1')}" </code></pre> <hr> <p>As a completely different alternative, you can also include JBoss EL in your project. It works on Tomcat 6.0 and you'll be able to invoke non-getter methods in EL. Drop <a href="https://maven.atlassian.com/content/repositories/jboss-releases/org/jboss/seam/jboss-el/2.0.0.GA/jboss-el-2.0.0.GA.jar" rel="nofollow noreferrer">jboss-el.jar</a> file in <code>/WEB-INF/lib</code> and add the following to your <code>web.xml</code>:</p> <pre><code>&lt;context-param&gt; &lt;param-name&gt;com.sun.faces.expressionFactory&lt;/param-name&gt; &lt;param-value&gt;org.jboss.el.ExpressionFactoryImpl&lt;/param-value&gt; &lt;/context-param&gt; </code></pre> <hr> <p>Since EL 2.2 there's another approach: create an <code>@ApplicationScoped</code> bean with methods in turn referring to those static functions. See also a.o. <a href="https://stackoverflow.com/questions/36718276/utility-methods-in-application-scoped-bean">Utility methods in application scoped bean</a>.</p>
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    1. POHow to create a custom EL function to invoke a static method?
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    1. COThanks for the quick reply BalusC !!! I tried the jobss-el.jar approach. The error is now gone, it displays 3 check boxes u1, u2, u3 but when i choose any of them nothing seems to happen (Chrome,Firefox) I also tested in Internet Exporer and after checking any of the check box it says: Webpage error details Message: 'mojarra' is undefined Line: 9 Char: 1 Code: 0 URI: http://localhost:8080/myproject/ajaxcall.jsf Am I missing anything? Thanks for your patience and thank you in advance BalusC
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    2. COYou're welcome. Your new question is actually a different question which needs to be asked by `Ask Question` button on the right top. Your initial question has been answered. Anyway, here's a hint: `<h:head>`.
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    3. COThanks again BalusC the jobss-el.jar approach worked like a charm! I'll ask my new question using the Ask Question.
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