Question

I am trying to call method using custom EL function with perameter of jsfbean.

<c:set var="test1" value="${cx:methodName('para')}" scope="session"/>
        <h:outputText value="#{test1}"/>

i made following id TLD and putted it into WEB-INF

  <?xml version="1.0" encoding="UTF-8" ?>
    <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">

        <tlib-version>1.0</tlib-version>
        <short-name>Custom_Functions</short-name>
        <uri>http://example.com/functions</uri>

        <function>
            <name>methodName</name>
            <function-class>funcionclass(Jsfbean)</function-class>
            <function-signature>java.lang.String methodName(java.lang.String)</function-signature>
        </function>
    </taglib>

i also configure in web.xml

<jsp-config> 
        <taglib> 
               <taglib-uri>http://example.com/functions</taglib-uri> 
               <taglib-location>/WEB-INF/functions.tld</taglib-location> 
        </taglib> 
</jsp-config>

and still it is getting Function not found error.

following is method code

public static String methodName(String s1) throws Exception
    {
        return "Kshitij";
    }

can any body help.

Answer 1

You’ve created a JSP EL function while you’re using Facelets. This is not going to work. Also, your <function-class> declaration is incorrect. It should specify the full qualified class name (FQN). E.g. com.example.FunctionClass.

Rename the taglib file to /WEB-INF/functions.taglib.xml with the following updated content:

<?xml version="1.0" encoding="UTF-8"?>
<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">
    <namespace>http://example.com/functions</namespace>

    <function>
        <function-name>methodName</function-name>
        <function-class>com.example.FunctionClass</function-class>
        <function-signature>java.lang.String methodName(java.lang.String)</function-signature>
    </function>
</facelet-taglib>

Then you need to register it in web.xml as follows (don’t forget to remove the old JSP taglib registration!):

<context-param>
    <param-name>javax.faces.FACELETS_LIBRARIES</param-name>
    <param-value>/WEB-INF/functions.taglib.xml</param-value>
</context-param>

Finally declare it in your view by the following XML namespace

xmlns:cx="http://example.com/functions"

---

Unrelated to the concrete problem, there’s an alternative approach, probably much easier: install JBoss EL. This way you will be able to invoke methods on beans like as possible in the new EL 2.2.