1. Create a tld file inside WEB-INF folder having declaration of the custom function as below
<?xml version="1.0" encoding="UTF-8" ?>
<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
version="2.0">
<description>JSTL 1.1 functions library</description>
<display-name>JSTL functions</display-name>
<tlib-version>1.1</tlib-version>
<short-name>fn</short-name>
<uri>http://java.sun.com/jsp/jstl/functions</uri>
<function>
<name>functionName</name>
<function-class>anshul.project.vaidya.test.Anshul</function-class>
<function-signature>
java.util.ArrayList<java.util.ArrayList> functionName( java.lang.String )
</function-signature>
</function>
</taglib>
2. Configure this tld file in web.xml as
<jsp-config>
<taglib>
<taglib-uri>$customURI</taglib-uri>
<taglib-location>$Absolute path of tld file inside WEB-INF starting with / </taglib-location>
</taglib>
</jsp-config>
3. Now to use the function in a jsp page add the taglib directive there as
<%@ taglib uri="$customURI" prefix="$customPrefix"%>
Now you can use the function anywhere in the page like:-
${customPrefix:functionName(parameter)}
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