13 Replies Latest reply on Mar 19, 2010 9:29 PM by chasetec

Simplest Weld Example (Does not work)

javanaute Mar 17, 2010 5:38 PM

Hello,

I have created a very simple dynamic web project using eclipse and added the following :

- A class with its package, annotated with @Named

package org.test;

import java.io.Serializable;

import javax.enterprise.context.SessionScoped;
import javax.inject.Named;

@Named
@SessionScoped
public class Hello implements Serializable {

     private static final long serialVersionUID = 1L;

     private final String text = "Hello!";

     public String getText() {
          return text;
     }

}

- A view called view.xhtml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html">
<h:head>
     <title>Hello</title>
</h:head>
<h:body>
     <h1>Hello</h1>
     <p>My weld-injected bean says : <h:outputText value="#{hello.text}" /></p>
</h:body>
</html>

- An empty beans.xml in WEB-INF

- I have nothing i my lib folder

- I have declared the JSF servlet in web.xml as follows :

     <servlet>
          <servlet-name>Faces Servlet</servlet-name>
          <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
          <load-on-startup>1</load-on-startup>
     </servlet>
     <servlet-mapping>
          <servlet-name>Faces Servlet</servlet-name>
          <url-pattern>*.jsf</url-pattern>
     </servlet-mapping>

- I run this in JBoss jboss-6.0.0.M2

** The problem is that nothing gets displayed from my bean ! I only get the text : My weld-injected bean says :

Anyone has an idea about what is going on !

Thanks.

1. Re: Simplest Weld Example (Does not work)

asookazian Mar 17, 2010 6:07 PM (in response to javanaute)

Have you added a debug brkpt in the getText() method? Is the method invoked?
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2. Re: Simplest Weld Example (Does not work)

nickarls Mar 17, 2010 9:42 PM (in response to javanaute)

add a faces-config.xml, too
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3. Re: Simplest Weld Example (Does not work)

javanaute Mar 18, 2010 11:14 AM (in response to javanaute)

thx for your replies guys.

I have added a faces-config and tested with the breakpoint too and getText does not get called, and i keep getting the same results.

Here is what JBoss displays on startup :

11:09:34,531 INFO [org.jboss.weld.Version] WELD-000900 1.0.1 (CR1)
11:09:34,813 INFO [org.jboss.web.tomcat.service.deployers.TomcatDeployment] deploy, ctxPath=/JBossTest
11:09:35,016 INFO [javax.enterprise.resource.webcontainer.jsf.config] Initialisation de Mojarra 2.0.2 (FCS b10)

My webapp is called JBoss test. When take of the beans.xml file i don't get the line :

11:09:34,531 INFO [org.jboss.weld.Version] WELD-000900 1.0.1 (CR1)
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4. Re: Simplest Weld Example (Does not work)

nickarls Mar 18, 2010 11:26 AM (in response to javanaute)

Drop in the numberguess example, does it work?
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5. Re: Simplest Weld Example (Does not work)

javanaute Mar 18, 2010 3:23 PM (in response to javanaute)

I have dropped the number guess in and this is what i get when JBoss starts up :

15:15:27,056 INFO [Version] WELD-000900 1.0.1 (CR1)
15:15:27,085 WARN [ControllerState] Deprecated usage of 'new ControllerState', use getInstance, caller: org.jboss.weld.integration.deployer.env.DynamicDependencyCreator.createDepenencies(DynamicDependencyCreator.java:73)
15:15:27,490 INFO [TomcatDeployment] deploy, ctxPath=/numberguess
15:15:27,708 INFO [config] Initializing Mojarra 2.0.2 (FCS b10) for context '/numberguess'

Now, http://localhost:8080/numberguess/home.jsf displays a page with :

Guess a number...
I'm thinking of a number between and . You have guesses remaining.
Your guess: Guess
Reset

The Guess button is disabled and no values are displayed at "between and ."

When i click on reset i get the following stack trace :

javax.servlet.ServletException: javax.el.PropertyNotFoundException: /home.xhtml @29,107 action="#{game.reset}": Target Unreachable, identifier 'game' resolved to null
     javax.faces.webapp.FacesServlet.service(FacesServlet.java:325)
     org.jboss.weld.servlet.ConversationPropagationFilter.doFilter(ConversationPropagationFilter.java:66)
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6. Re: Simplest Weld Example (Does not work)

nickarls Mar 18, 2010 9:46 PM (in response to javanaute)

Try updating Weld in the AS. Download 1.0.1-Final, unzip and go the the jboss-as folder and edit the jboss.home property to point to the AS home and then run mvn in that folder (we all have maven 2.0.10 installed, right?) ;-)
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7. Re: Simplest Weld Example (Does not work)

chasetec Mar 18, 2010 10:59 PM (in response to javanaute)

Your url-pattern is wrong, it should be *.xhtml.

Also you only need to be using the transitional DTD in your facelet.
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8. Re: Simplest Weld Example (Does not work)

nickarls Mar 18, 2010 11:37 PM (in response to javanaute)

you mean the default suffix param?
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9. Re: Simplest Weld Example (Does not work)

chasetec Mar 19, 2010 1:40 AM (in response to javanaute)

I mean the url-pattern in his web.xml. He has *.jsf. You need to either put all your facelet pages underneath a directory and use a "*" pattern or use the "*.xhtml" pattern which allows you to place the facelet pages in any location.

The OP is more than likely requesting the view.xhtml in his web browser which is by-passing the JSF servlet, returning the source as a static xhtml page. I bet if he views the source html is his web browser he will see the non-rendered <h:outputText value="#{hello.text}" /> tag.
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10. Re: Simplest Weld Example (Does not work)

nickarls Mar 19, 2010 7:41 AM (in response to javanaute)

Doesn't explain the numberguess issue.
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11. Re: Simplest Weld Example (Does not work)

javanaute Mar 19, 2010 6:50 PM (in response to javanaute)

So far, i have tried to put .xhtml as the default suffix param but this generates errors with a Stack Overflow.

Have not tried with the new weld version but instead created another project with the maven archetype and every thing works fine with this same version. I could repair my app by replacing my WEB-INF folder with the one generated by the maven archetype, but could not fix the number guess app !

Don't know what is going on ! Is it WTP that does not work correctly ?

Could anyone point me out to a simple WTP tutorial with Weld.
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12. Re: Simplest Weld Example (Does not work)

javanaute Mar 19, 2010 6:54 PM (in response to javanaute)

Just a precision : i used the weld maven archetype that i found here : http://www.seamframework.org/Documentation/WeldQuickstartForMavenUsers
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13. Re: Simplest Weld Example (Does not work)

chasetec Mar 19, 2010 9:29 PM (in response to javanaute)

>> So far, i have tried to put .xhtml as the default suffix param but this generates errors with a Stack Overflow.

As I said, NOT the suffix setting. The url-pattern should either be *.xhtml" or "somedir/*". Don't even include the suffix setting in your web.xml. If you view your WEB-INF/web.xml you'll find a difference between the working and non-working versions.

Just in-case you aren't clear, the suffix setting (which you shouldn't need) is:
   <context-param>
      <param-name>javax.faces.DEFAULT_SUFFIX</param-name>
      <param-value>.xhtml</param-value>
   </context-param>

The url-pattern, that you should have for your hello world app is:
   <servlet-mapping>
      <servlet-name>Faces Servlet</servlet-name>
      <url-pattern>*.xhtml</url-pattern>
   </servlet-mapping>

Using *.jsf is a poor choice because it allows people to bypass the JSF implementation and view you facelet source. See http://weld-numberguess.appspot.com/home.xhtml and http://weld-numberguess.appspot.com/home.jsf for an example of what I'm talking about. It's confusing for developers and end-users.

You probably have a deployment descriptor problem with the numberguess app, there are several web.xml files you have to choice from. You have to combine the contents of two different WEB-INF directories to get all the xml files you need. You probably either had the wrong or missing web.xml and/or a missing beans.xml in the numberguess app you deployed.

As a suggestion, stop messing around with maven for now, just use the simplest method you have at your disposal to create a Java EE 6 web project.

Please note that your initial problem wasn't Weld related. You are having issues correctly configuring your deployment descriptor for JSF. Start with a facelet page that just has <h:outputText value="Hello" />. Once you get that working you can add the beans.xml file and start trying out Weld.
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