JBoss Seam Debug Page.

Hi
If you are working on project that it use seam framework, This page can help you for better understanding of your project.

Step 1 :

You should put the Jboss-seam-debug.jar library in your WEB-INF/lib  directory.

Step 2:

in Component.xml file you should write this code :
<core:init debug=“true”/>

Step 3:

When your application deployed,Open your browser and enter this url:
http://localhost:8080/<your application>/debug.seam

[screen shot]

Bye

Run Seam projects in eclipse on Tomcat

Hi
I found one of the best solution for creating and running seam projects in eclipse on Tomcat so quickly :
http://techieexchange.wordpress.com/2007/11/11/rad-seam-development-with-eclipse-and-tomcat-step-by-step-tutorial-screencast/

bye

Seam injection in threads.

Hi
In seam, when you want to inject some components such as EntityManager,POJOs,or … to threads, Probably you will  see all your objects is NULL.
The reason of this scenario is SeamApplicationContext missing in your threads, OK what is the solution?

You should use Lifecycle.begin() and Lifecycle.end() methods before and after your codes :

….
…….
Lifecycle.begin()
EntityManager em = (EntityManager)Component.getInstance(“em”,true);
Lifecycle.End()
……
…

So when you write your codes between these two methods, You will be in the SeamApplicationContext and you will not see any exceptions for EntityManager too like :

EntityManager is closed
no Transaction is in progress
….
..

bye.

@In attribute requires non-null value: sampleAction.sample

Hi
If you are new to Seam framework and you get this stupid exception,You should read Seam annotation reference as well. OK this is my code :

[Sample class] …
…
@Name(“sample”)
public Class Sample ..
..
..

and next class is :

@Name(“sampleAction”)
public Class SampleAction …
….
..
@In
private Sample sample

public void someMethod(){
System.out.println(“I love Seam ….”);
}

…

….

And probably you get this exception :

javax.faces.FacesException: #{sampleAction.sample}: org.jboss.seam.
RequiredException: @In attribute requires non-null value: sampleAction.sample
	com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:118)
	javax.faces.component.UICommand.broadcast(UICommand.java:387)
	org.ajax4jsf.component.AjaxViewRoot.processEvents(AjaxViewRoot.java:321)
	org.ajax4jsf.component.AjaxViewRoot.broadcastEvents(AjaxViewRoot.java:296)
	org.ajax4jsf.component.AjaxViewRoot.processPhase(AjaxViewRoot.java:253)
	org.ajax4jsf.component.AjaxViewRoot.processApplication(AjaxViewRoot.java:466)
	com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:82)
	com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)

OK, You should modify @In annotation :

@In(create=true)

enjoy it …
bye