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Using function in EL in portlet

  • 1.  Using function in EL in portlet

    Posted Sun December 16, 2018 06:45 AM

    Hi,
    I try to adapt the idea in this url to my portlet :
    https://newfivefour.com/tomcat7-el-custom-function.html

    In my portlet I create this class in package named pck :

    
public class Common {

public static String getDateFormat(String oldDateString) throws ParseException { 
final String OLD_FORMAT = "yyyy-MM-dd";
final String NEW_FORMAT = "dd/MM/yyyy";

String newDateString;

SimpleDateFormat sdf = new SimpleDateFormat(OLD_FORMAT);
Date d = sdf.parse(oldDateString);
sdf.applyPattern(NEW_FORMAT);
newDateString = sdf.format(d);
return newDateString;
}
}

    So I created a file in WEF_INF folder named : taglib.tld

    
<?xml version="1.0" encoding="UTF-8"?>
<taglib version="2.1" 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">
<tlib-version>1.0</tlib-version>
<short-name>common</short-name>
[u]<uri>/</uri>[/u]  
<function>
<name>getDateFormat</name>
<function-class>
pck.Common
</function-class>
<function-signature>
java.lang.String getDateFormat(java.lang.String)
</function-signature>
</function> 
</taglib>

    And I modified my web.xml with

    
</web-app>
...
<jsp-config>
<taglib>
<taglib-uri>
[u]http://myurl[/u]
</taglib-uri>
<taglib-location>
/WEB-INF/taglib.tld
</taglib-location>
</taglib> 
</jsp-config>
</web-app>

    And I modified a data in portlet with the following expression : #{a:getDateFormat(myVariable)}

    But I need help about somethings :

    1. Is taglib work with CAF ?
    2. in uri tag in taglib (underline in taglib.tld file) I don’t know what to make
    3. in taglib-uri tab in web.config (underline in web.xml file) I don’t know what to make
    4. In the link I put :
      I need to make this statement in html file :
    <%@ taglib uri="http://myurl" prefix="a" %>

    But I dont know where


    #MWS-CAF-Task-Engine
    #webMethods-BPMS
    #webMethods


  • 2.  RE: Using function in EL in portlet

    Posted Mon December 17, 2018 12:35 PM

    OK I fix some issues, I feel I am close to find the solution but it doesn’t come.

    OK As the first comment, I create the following Class in package we will call pkg

    public class Common {  

public static String getDateFormat(String oldDateString) throws ParseException {   
final String OLD_FORMAT = "yyyy-MM-dd";  
final String NEW_FORMAT = "dd/MM/yyyy";  

String newDateString;  

SimpleDateFormat sdf = new SimpleDateFormat(OLD_FORMAT);  
Date d = sdf.parse(oldDateString);  
sdf.applyPattern(NEW_FORMAT);  
newDateString = sdf.format(d);  
return newDateString;  
}  
}

    Then I migrate my view to be in JSF 2. I can see a xhtml file for my view (instead of a xml file).

    Then I create a file in /WEB-INF called common.taglib.xml like this :

    
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE facelet-taglib PUBLIC
"-//Sun Microsystems, Inc.//DTD Facelet Taglib 1.0//EN"
"https://facelets.dev.java.net/source/browse/*checkout*/facelets/src/etc/facelet-taglib_1_0.dtd">
<facelet-taglib xmlns="http://java.sun.com/JSF/Facelet">
<namespace>http://url-which-doesnt-exist-in-relaity-but-exist-for-my-namespace</namespace>
<function>
<function-name>getDateFormat</function-name>
<function-class>pkg.Common</function-class>
<function-signature>java.lang.String getDateFormat(java.lang.String)</function-signature>
</function>
</facelet-taglib>

    As you see, the url : http://url-which-doesnt-exist-in-relaity-but-exist-for-my-namespace is not a real url it is just a namespace.

    Then I modify my web.xml file and add the following tags :

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

    Then in my xhtml view fille I add the following namespace :

    
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://xmlns.jcp.org/jsf/facelets"
xmlns:caf_f="http://webmethods.com/jsf/caf/core"
xmlns:caf_h="http://webmethods.com/jsf/caf/html"
xmlns:f="http://xmlns.jcp.org/jsf/core"
[b]xmlns:a="http://url-which-doesnt-exist-in-relaity-but-exist-for-my-namespace"[/b]>
....

    And In my variable Toto in Binding view I add the following expression :

    #{a:getDateFormat("2018-01-01")}

    But it seems that doesn’t work :
    In full.log file in server, I have the following error :

    javax.el.ELException: Function ‘a:getDateFormat’ not found

    So I guess I forgot something, maybe it is the url in namespace but I don’t know how to fix it.


    #webMethods-BPMS
    #MWS-CAF-Task-Engine
    #webMethods


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