Stateless Injection

[ovidiucn]

Hello!

I encountered a strange behaviour of the stateless components. It seems that, even i'm requesting the container to inject a certain bean, the injection never occurs and, of course the value of the bean is null.

If i'm removing the @Stateless annotation, it works just fine.

Can anybody help me with this?

PS: for this one, i've studied the jboss seam registration example and i followed the same pattern.

[cptnkirk]

Show your code.

[ovidiucn]

Thank you for being so quick.

/***********************************/

/* local interface */
@Local
public interface UserManagementLocal {
public Collection getUsers ();
}

/***********************************/

/* business logic */
@Name("userManagement")
@Stateless
public class UserManagement implements UserManagementLocal {

/* The login context created when a user previously logged-in. */
@In(value="loginContext", create=false, required=true)
private LoginContext loginContext;

@In (value="user", create=true, required=true)
private User user;

@In
Context sessionContext;

public Collection getUsers() {
Collection users = new ArrayList ();

/* user bean is null !!! */
/* sessionContext is null !!! */
/* the loginContext is null !!! */

System.out.println("user: " + user);
System.out.println("sessionContext: " + sessionContext);
System.out.println("loginContext: " + loginContext);

try {
SecurityDataService sds = SecurityDataServiceFactory.getService(loginContext.getSubject());

Set attributeNames = new HashSet();
users.addAll(sds.getAllUsers(attributeNames));
} catch (SSDataManagementException e) {
e.printStackTrace();
users.clear();
}

return users;
}
}

/***********************************/
/* JBoss Seam configuration(s) */

<!-- web.xml snippet -->



<listener-class>
org.jboss.seam.servlet.SeamListener
</listener-class>




<!-- faces-config.xml snippet -->
<!-- using myfaces-1.1.3 -->



<phase-listener>org.jboss.seam.jsf.SeamPhaseListener</phase-listener>




<!-- WEB-INF/components.xml -->




true
<!-- using myfaces-1.1.3 -->
false
emp/#{ejbName}/local






<!-- WEB-INF/classes/seam.properties exists & is empty -->
<!-- service-security.jar#!seam.properties exists & is empty -->

Environment:
JRE 1.5.0_06
JBOSS Release ID: JBoss [Zion] 4.0.4.GA (build: CVSTag=JBoss_4_0_4_GA date=200605151000) - installed with JEMS & ejb3 configuration enabled
JBoss Seam 1.0.1.GA
MyFaces 1.1.3

Thanks!

[gavin.king]

Now please post it all again, but with code tags.

What is in ejb-jar.xml?

[ovidiucn]

Ok.

/* WEB-INF/classes/seam.properties exists & is empty */
/* service-security.jar#!seam.properties exists & is empty */

/* ejb-jar.xml */

<ejb-jar>
 <assembly-descriptor>
 <interceptor-binding>
 <ejb-name>*</ejb-name>
 <interceptor-class>org.jboss.seam.ejb.SeamInterceptor</interceptor-class>
 </interceptor-binding>
 </assembly-descriptor>
</ejb-jar>

/* WEB-INF/components.xml */

<components>
 <component name="org.jboss.seam.core.init">
 <property name="debug">true</property>
 <property name="myFacesLifecycleBug">false</property>
 <property name="jndiPattern">emp/#{ejbName}/local</property>
 </component>
 <component class="org.jboss.seam.core.Microcontainer" installed="false"/>
</components>

/* faces-config.xml snippet */

<?xml version='1.1' encoding='UTF-8'?>

<!DOCTYPE faces-config PUBLIC
 "-//Sun Microsystems, Inc.//DTD JavaServer Faces Config 1.1//EN"
 "http://java.sun.com/dtd/web-facesconfig_1_1.dtd">

<faces-config>
 <lifecycle>
 <phase-listener>org.jboss.seam.jsf.SeamPhaseListener</phase-listener>
 </lifecycle>
</faces-config>

/* web.xml snippet */

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" 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-app_2_4.xsd">

 <!-- Seam -->
 <listener>
 <listener-class>
 org.jboss.seam.servlet.SeamListener
 </listener-class>
 </listener>

 <!-- MyFaces -->
 <listener>
 <listener-class>
 org.apache.myfaces.webapp.StartupServletContextListener
 </listener-class>
 </listener>

 <!-- Faces Servlet -->
 <servlet>
 <servlet-name>Faces Servlet</servlet-name>
 <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
 <load-on-startup>1</load-on-startup>
 </servlet>

 <!-- Faces Servlet Mappings -->
 <servlet-mapping>
 <servlet-name>Faces Servlet</servlet-name>
 <url-pattern>*.xhtml</url-pattern>
 </servlet-mapping>
</web-app>

/* code */

/* local interface */
@Local
public interface UserManagementLocal {
 public Collection getUsers ();
}

/* business logic */
@Name("userManagement")
@Stateless
public class UserManagement implements UserManagementLocal {

 /* The login context created when a user previously logged-in. */
 @In(value="loginContext", create=false, required=true)
 private LoginContext loginContext;

 @In (value="user", create=true, required=true)
 private User user;

 @In
 Context sessionContext;

 public Collection getUsers() {
 Collection users = new ArrayList ();

 /* user bean is null !!! */
 /* sessionContext is null !!! */
 /* the loginContext is null !!! */

 System.out.println("user: " + user);
 System.out.println("sessionContext: " + sessionContext);
 System.out.println("loginContext: " + loginContext);

 try {
 SecurityDataService sds = SecurityDataServiceFactory.getService(loginContext.getSub
ject());

 Set attributeNames = new HashSet();
 users.addAll(sds.getAllUsers(attributeNames));
 } catch (SSDataManagementException e) {
 e.printStackTrace();
 users.clear();
 }

 return users;
 }
}

Environment:
JRE 1.5.0_06
JBOSS Release ID: JBoss [Zion] 4.0.4.GA (build: CVSTag=JBoss_4_0_4_GA date=200605151000) - installed with JEMS & ejb3 configuration enabled
JBoss Seam 1.0.1.GA
MyFaces 1.1.3

Thanks!

[cptnkirk]

Your url-pattern for your faces servlet mapping seems odd to me. Do you really have .jsp files that you get to via an .xhtml extension? foo.xhtml -> foo.jsp? How is userManagement.getUsers() getting called? Please show your view markup.

[ovidiucn]

Ok... I think i forgot something. I'm using also facelets and i have also overriden the default suffix property in web.xml file; that is:

 <context-param>
 <param-name>javax.faces.DEFAULT_SUFFIX</param-name>
 <param-value>.xhtml</param-value>
 </context-param>

so calling for *.xhtml files works.

The part in which i'm calling the local interface looks like this:

@Name("userCBTModel")
@Scope(ScopeType.SESSION)
public class UserCBTModel implements CBTModel {

 @In(value = "userManagement", create = true, required = true)
 private UserManagementLocal userManagement;

 public CBTPage getPage(CBTPageInfo pInfo) {
 PageImpl page = new PageImpl();
 PageInfoImpl pInfoImpl = (PageInfoImpl) pInfo;
 int startIndex = pInfoImpl.getPageNumber() * pInfoImpl.getDefaultPageSize();
 int count = pInfoImpl.getDefaultPageSize();

 boolean useFilter = ((pInfo == null) ? false
 : ((pInfo.getFilter() == null) ? false : true));

 List<SSUser> users = new ArrayList<SSUser> ();
 try {
 users.addAll(userManagement.getUsers());
 } catch (NullPointerException npe) {
 logger.error("Userul logat nu are rol pentru a vedea userii:");
 users.clear();
 }

 /* prepare a new page */

 return page;
 }
}

And the presentation markup is as follows:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
 xmlns:ui="http://java.sun.com/jsf/facelets"
 xmlns:h="http://java.sun.com/jsf/html"
 xmlns:f="http://java.sun.com/jsf/core">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<link rel="stylesheet" type="text/css" href="css/style.css" />
<title>Checkbox table template</title>
</head>
<body>

<ui:composition>
<f:view>
<h:form id="dataForm" rendered="#{userCBTModel.page.size != 0}">
 <h:dataTable id="items" value="#{userCBTModel.page.items}" var="item"
 rowClasses="list-row-odd, list-row-even" styleClass="tData" columnClasses="tData" rows="#{cbtBean.page.size}">

 <ui:insert name="tColumns">Table columns</ui:insert>

 </h:dataTable>
</h:form>
</f:view>
</ui:composition>
</body>
</html>

The overall behaviour can be described as:
* the userManagement component (either is a stateless bean or just a pojo) it gets injected into userCBTModel bean - always;
* if the userManagement component is a stateless bean, its attributes are not injected;
* if the userManagement component is not a stateless bean (i.e. done by just removing the @Stateless annotation) works fine - all its attributes are injected; if i'm removing the stateless annotation it is treated as a simple java bean and its scope is EVENT.

Thank you.

[gavin.king]

Use your debugger to find out if SeamInterceptor is *really* wrapping the calls to the stateless bean.

[ovidiucn]

Hello!
It seems i discovered the problem. I was using several ejb jar files and by accident, in the jar which contained the Stateless bean i forgot to put the META-INF/ejb-jar.xml file. Now, everything is OK.

Thank you guys for your support,
Ovidiu