EL Configuration Problem

[Timothy Sam]

Hi, I'm having a problem configuring EL in my web.xml file. I'm modifying the web.xml in my application and I am using Tomcat 5.0. Currently, my web.xml looks like this...

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
                         "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
 <display-name>AssetManagementSystem</display-name>
 <servlet>
  <servlet-name>action</servlet-name>
  <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
  <init-param>
   <param-name>config</param-name>
   <param-value>/WEB-INF/struts-config.xml</param-value>
  </init-param>
  <load-on-startup>1</load-on-startup>
 </servlet>
 <servlet-mapping>
  <servlet-name>action</servlet-name>
  <url-pattern>*.do</url-pattern>
 </servlet-mapping>
 <welcome-file-list>
  <welcome-file>index.jsp</welcome-file>
 </welcome-file-list>
 <taglib>
  <taglib-uri>/WEB-INF/struts-bean</taglib-uri>
  <taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
 </taglib>
 <taglib>
  <taglib-uri>/WEB-INF/struts-logic</taglib-uri>
  <taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
 </taglib>
 <taglib>
  <taglib-uri>/WEB-INF/struts-html</taglib-uri>
  <taglib-location>/WEB-INF/struts-html.tld</taglib-location>
 </taglib>
</web-app>

Following the example given in http://courses.coreservlets.com/Course-Materials/pdf/struts/Struts-and-JSP2-EL.pdf
I tried to modify my web.xml into something like this...

<web-app xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee web-app_2_4.xsd" version="2.4"> 
.
.
.
.
 
</web-app>

But Eclipse is giving me these errors that says...

4:93 Attribute "version" must be declared for element type "web-app".
4:93 Attribute "xsi:schemaLocation" must be declared for element type "web-app".
Attribute "version" must be declared for element type "web-app".
Attribute "xsi:schemaLocation" must be declared for element type "web-app".

Please help...

[Ben Souther]

The web.xml file that ships with Tomcat (tomcat/webapps/ROOT/WEB-INF/web.xml) is properly configured for use with EL.

You've got a Servlet 2.3 declaration in your web-app tag.

[Timothy Sam]

Thanks! I've already tried subtituting that line with

<web-app 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 <a href="http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"" target="_blank" rel="nofollow">http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"</a>
    version="2.4">

but I still get the same error message... I did follow your instruction... To be more precise with my version of Tomcat... I'm using Tomcat 5.0

Are there any Jar files that I need to place in the lib folder?
[ January 17, 2006: Message edited by: Timothy Sam ]

[Bear Bibeault]

There is a JSP FAQ entry that contains all the info you need.

[Timothy Sam]

hey guys, sorry but I still get the same error after following what is said in the FAQ... Actually, the instructions provided in the FAQ isn't any diffent from the other sites I've seen... Please check my xml file and see what's wrong with it...

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
                         "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app 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 <a href="http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"" target="_blank" rel="nofollow">http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"</a>
     version="2.4">
 <display-name>AssetManagementSystem</display-name>
 <servlet>
  <servlet-name>action</servlet-name>
  <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
  <init-param>
   <param-name>config</param-name>
   <param-value>/WEB-INF/struts-config.xml</param-value>
  </init-param>
  <load-on-startup>1</load-on-startup>
 </servlet>
 <servlet-mapping>
  <servlet-name>action</servlet-name>
  <url-pattern>*.do</url-pattern>
 </servlet-mapping>
 <welcome-file-list>
  <welcome-file>index.jsp</welcome-file>
 </welcome-file-list>
 <taglib>
  <taglib-uri>/WEB-INF/struts-bean</taglib-uri>
  <taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
 </taglib>
 <taglib>
  <taglib-uri>/WEB-INF/struts-logic</taglib-uri>
  <taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
 </taglib>
 <taglib>
  <taglib-uri>/WEB-INF/struts-html</taglib-uri>
  <taglib-location>/WEB-INF/struts-html.tld</taglib-location>
 </taglib>
</web-app>

Here are the errors again...

Attribute "version" must be declared for element type "web-app".
Attribute "xmlns:xsi" must be declared for element type "web-app".
Attribute "xmlns" must be declared for element type "web-app".
Attribute "xsi:schemaLocation" must be declared for element type "web-app".
cvc-complex-type.2.4.a: Invalid content was found starting with element 'taglib'. One of '{"http://java.sun.com/xml/ns/j2ee" escription, "http://java.sun.com/xml/ns/j2ee" isplay-name, "http://java.sun.com/xml/ns/j2ee":icon, "http://java.sun.com/xml/ns/j2ee" istributable, "http://java.sun.com/xml/ns/j2ee":context-param, "http://java.sun.com/xml/ns/j2ee":filter, "http://java.sun.com/xml/ns/j2ee":filter-mapping, "http://java.sun.com/xml/ns/j2ee":listener, "http://java.sun.com/xml/ns/j2ee":servlet, "http://java.sun.com/xml/ns/j2ee":servlet-mapping, "http://java.sun.com/xml/ns/j2ee":session-config, "http://java.sun.com/xml/ns/j2ee":mime-mapping, "http://java.sun.com/xml/ns/j2ee":welcome-file-list, "http://java.sun.com/xml/ns/j2ee":error-page, "http://java.sun.com/xml/ns/j2ee":jsp-config, "http://java.sun.com/xml/ns/j2ee":security-constraint, "http://java.sun.com/xml/ns/j2ee":login-config, "http://java.sun.com/xml/ns/j2ee":security-role, "http://java.sun.com/xml/ns/j2ee":env-entry, "http://java.sun.com/xml/ns/j2ee":ejb-ref, "http://java.sun.com/xml/ns/j2ee":ejb-local-ref, "http://java.sun.com/xml/ns/j2ee":service-ref, "http://java.sun.com/xml/ns/j2ee":resource-ref, "http://java.sun.com/xml/ns/j2ee":resource-env-ref, "http://java.sun.com/xml/ns/j2ee":message-destination-ref, "http://java.sun.com/xml/ns/j2ee":message-destination, "http://java.sun.com/xml/ns/j2ee":locale-encoding-mapping-list}' is expected.

sorry fo the bother... Thanks!
[ January 17, 2006: Message edited by: Timothy Sam ]

[Bear Bibeault]

Why do you have a DOCTYPE entry declaring the web app as a 2.3 web app AND a web-app element declaring it as a 2.4 app?

It can't be both.

[Timothy Sam]

I wonder if it's eclipse that has a problem... I'm only getting a single error now but it's really annoying... Here's my updated web.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.4//EN"
                         "http://java.sun.com/dtd/web-app_2_4.dtd">
<web-app 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 <a href="http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"" target="_blank" rel="nofollow">http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"</a>
     version="2.4">
 <display-name>AssetManagementSystem</display-name>
 <servlet>
  <servlet-name>action</servlet-name>
  <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
  <init-param>
   <param-name>config</param-name>
   <param-value>/WEB-INF/struts-config.xml</param-value>
  </init-param>
  <load-on-startup>1</load-on-startup>
 </servlet>
 <servlet-mapping>
  <servlet-name>action</servlet-name>
  <url-pattern>*.do</url-pattern>
 </servlet-mapping>
 <welcome-file-list>
  <welcome-file>index.jsp</welcome-file>
 </welcome-file-list>
 <taglib>
  <taglib-uri>/WEB-INF/struts-bean</taglib-uri>
  <taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
 </taglib>
 <taglib>
  <taglib-uri>/WEB-INF/struts-logic</taglib-uri>
  <taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
 </taglib>
 <taglib>
  <taglib-uri>/WEB-INF/struts-html</taglib-uri>
  <taglib-location>/WEB-INF/struts-html.tld</taglib-location>
 </taglib>
</web-app>

and here's the error message...

The markup declarations contained or pointed to by the document type declaration must be well-formed.

[Bear Bibeault]

Remove the DOCTYPE declaration.

[Timothy Sam]

I get these errors when I remove that...

cvc-complex-type.2.4.a: Invalid content was found starting with element 'taglib'. One of '{"http://java.sun.com/xml/ns/j2ee":description, "http://java.sun.com/xml/ns/j2ee":display-name, "http://java.sun.com/xml/ns/j2ee":icon, "http://java.sun.com/xml/ns/j2ee":distributable, "http://java.sun.com/xml/ns/j2ee":context-param, "http://java.sun.com/xml/ns/j2ee":filter, "http://java.sun.com/xml/ns/j2ee":filter-mapping, "http://java.sun.com/xml/ns/j2ee":listener, "http://java.sun.com/xml/ns/j2ee":servlet, "http://java.sun.com/xml/ns/j2ee":servlet-mapping, "http://java.sun.com/xml/ns/j2ee":session-config, "http://java.sun.com/xml/ns/j2ee":mime-mapping, "http://java.sun.com/xml/ns/j2ee":welcome-file-list, "http://java.sun.com/xml/ns/j2ee":error-page, "http://java.sun.com/xml/ns/j2ee":jsp-config, "http://java.sun.com/xml/ns/j2ee":security-constraint, "http://java.sun.com/xml/ns/j2ee":login-config, "http://java.sun.com/xml/ns/j2ee":security-role, "http://java.sun.com/xml/ns/j2ee":env-entry, "http://java.sun.com/xml/ns/j2ee":ejb-ref, "http://java.sun.com/xml/ns/j2ee":ejb-local-ref, "http://java.sun.com/xml/ns/j2ee":service-ref, "http://java.sun.com/xml/ns/j2ee":resource-ref, "http://java.sun.com/xml/ns/j2ee":resource-env-ref, "http://java.sun.com/xml/ns/j2ee":message-destination-ref, "http://java.sun.com/xml/ns/j2ee":message-destination, "http://java.sun.com/xml/ns/j2ee":locale-encoding-mapping-list}' is expected.

<?xml version="1.0" encoding="ISO-8859-1"?>
 
<web-app 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 <a href="http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"" target="_blank" rel="nofollow">http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"</a>
    version="2.4">
 <display-name>AssetManagementSystem</display-name>
 <servlet>
  <servlet-name>action</servlet-name>
  <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
  <init-param>
   <param-name>config</param-name>
   <param-value>/WEB-INF/struts-config.xml</param-value>
  </init-param>
  <load-on-startup>1</load-on-startup>
 </servlet>
 <servlet-mapping>
  <servlet-name>action</servlet-name>
  <url-pattern>*.do</url-pattern>
 </servlet-mapping>
 <welcome-file-list>
  <welcome-file>index.jsp</welcome-file>
 </welcome-file-list>
 <taglib>
  <taglib-uri>/WEB-INF/struts-bean</taglib-uri>
  <taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
 </taglib>
 <taglib>
  <taglib-uri>/WEB-INF/struts-logic</taglib-uri>
  <taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
 </taglib>
 <taglib>
  <taglib-uri>/WEB-INF/struts-html</taglib-uri>
  <taglib-location>/WEB-INF/struts-html.tld</taglib-location>
 </taglib>
</web-app>

[ January 17, 2006: Message edited by: Timothy Sam ]
[ January 17, 2006: Message edited by: Timothy Sam ]

[Bear Bibeault]

The error message clearly shows you the elements that are allowed and what order they should be in. Notice that taglib is nowhere to be found.

[Stefan Evans]

Taglib declarations should appear nested under jsp-config section.
ie

<web-app 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 
<a href="http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"" target="_blank" rel="nofollow">http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"</a>    
version="2.4">
 
...
 
<jsp-config>
  <taglib>
  ...
  </taglib>
  ...
</jsp-config>

However I don't normally bother with them now.
The tlds are bundled with struts.jar. If you use the common uri for the struts taglibs, you don't need any entries in web.xml

These are the ones I use for struts 1.2

<%@ taglib prefix="html" uri="http://struts.apache.org/tags-html"%>
<%@ taglib prefix="bean" uri="http://struts.apache.org/tags-bean"%>
<%@ taglib prefix="logic" uri="http://struts.apache.org/tags-logic"%>
[ January 17, 2006: Message edited by: Bear Bibeault ]

[Timothy Sam]

Bear, Stefan
Thanks fot your help guys! I was finally Able to solve my problem! Bear, I was finally able to get what you said and applied it to my code. Thank you guys!Thank you soooo much!