Take a look at this -
Date: Mon, 13 Oct 2008 16:26:56 -0500
From: Timothy.Quinn_at_Sun.COM
To: ejb_at_glassfish.dev.java.net
CC: persistence_at_glassfish.dev.java.net
Subject: Re: injections
Eve,
It's important to note that the Java EE 5 spec specifies that injection take place only in "managed" classes. In the app client, there are only two managed classes: the main class (as specified either in the manifest or on the appclient command line) and the optional log-in callback class.
Also, the spec also mandates that in the app client main class only static elements can be injected.
Here is one general approach that some people find works for them:
1. Define the injected static fields on the app client's main class:
@EJB
private static UsersRemote usersRemote;
2. Write a static accessor method on the app client's main class:
static UserRemote getUserRemote() {
return usersRemote;
}
3. From anywhere in any of the classes in your app client use Main.getUserRemote() when you need to use the EJB.
- Tim
Eve Pokua wrote:
Hello Ian/Everyone,
Yes,
I have carried out a lot more testing and found that this seems to work
on the first main class or any class that is run with appclient. Any other class
that I call from the main class, results as NullPointer when I try to insert. E.g:
If I try insert data of the same bean from the main class, I get the following:
C:\jee\STOCKINFOR2>appclient -client STOCKINFOR2-app-client.jar
successfully recorded new Department details
However, if I call the class from the main class, then I get the following:
C:\jee\STOCKINFOR2>appclient -client STOCKINFOR2-app-client.jar
Caught an Exception: can not insert new Department details
java.lang.NullPointerException
at stockinfor2.NewDepartclient.saveNewDeptdetails(NewDepartclient.java:1
22)
at stockinfor2.NewDepartclient.newdepatbutActionPerformed(NewDepartclien
t.java:113)
So I guess, I have to use just one JFrame client and use containers such as panels and so forth, to separate this.
Or I have to use lookups - Context.
This' now the limitation with server side JEE combined with Client side programming.
Thanks for your help.
eve
> Date: Thu, 2 Oct 2008 14:06:29 -0700
> From: Ian.Evans_at_Sun.COM
> To: ejb_at_glassfish.dev.java.net
> CC: persistence_at_glassfish.dev.java.net
> Subject: Re: injections
>
> Eve Pokua wrote:
> > I followed your advice and created a whole new application. Took a copy
> > of the tutorial client:
> >
> > package newapplication;
> > import javax.ejb.EJB;
> > import machinedetails2.*;
> > /**
> > *
> > * @author Administrator
> > */
> > public class Main {
> >
> > @EJB
> > private static UsersRemote usersRemote;
> > public Main(String[] args) {
> > }
> > /**
> > * @param args the command line arguments
> > */
> > public static void main(String[] args) {
> > Main client = new Main(args);
> > client.doTest();
> > }
> >
> > public void doTest() {
> > try {
> > usersRemote.createUser("t7","testing7","null","null");
> > System.out.println("successfull");
> >
> > } catch (Exception ex) {
> > System.err.println("Caught a Exception: not working ");
> >
> > ex.printStackTrace();
> > //System.exit(0);
> > }
> > }
> > }
> >
> >
> >
> > amended it, tested it on my application and for the first time in
> > a hundred years it works.
> >
> > So, sorry everyone, it was all my mistake trying to mix swing user interface
> > with JEE 5 injection. I also took a look at the dukesbank application
> > and got
> > confuse with the BankAdmin.java swing application. Thought I could do it.
>
> You can use injection in Swing apps provided the application is run via
> the application client container (appclient in GlassFish). It's possible
> that problem you had with your original Swing app was your use of an
> injected resource in your nested class. Or you may not have instantiated
> the inner class before calling actionPerformed().
>
> In general, it's easier to test your server application with a simple
> console test client, as you did above, before coding the GUI application.
>
> > Thanking you all for your patience and excuse me if I offended anyone.
>
> No offense at all. Glad you got through one tough patch to getting your
> app running.
>
> -ian
> --
> Ian Evans
> ian dot evans at sun dot com
> Java EE technical documentation
>
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>
Sorry,
I am copying because, this' the only copy I have of the above thread which really helped me. Maybe
someone from sun could explain if this issue is addressed in glassfish V3 and or EJB3 and how
do we use it?
eve
> Date: Fri, 16 Oct 2009 07:55:08 -0700
> From: glassfish_at_javadesktop.org
> To: users_at_glassfish.dev.java.net
> Subject: How to inject EJB to Servlet Filter?
>
> I failed to inject an EJB instance to my servlet filter:
>
> import java.io.IOException;
> import java.io.InputStream;
> import java.util.logging.Level;
> import java.util.logging.Logger;
>
> import javax.ejb.EJB;
>
> import org.apache.struts2.dispatcher.FilterDispatcher;
>
> import my.package.MyBeanHome;
>
> @EJB(beanInterface = MyBeanHome.class)
> public class MyFilterDispatcher extends FilterDispatcher {
> private static final Logger LOGGER = Logger.getLogger(MyFilterDispatcher.class.getName());
>
> @EJB
> private MyBeanHome myBean;
>
> //...
> }
>
> myBean is always NULL.
>
> An org.apache.struts2.dispatcher.FilterDispatcher implements org.apache.struts2.StrutsStatics and javax.servlet.Filter.
>
> MyBeanHomeBean is a stateless bean.
>
> What do I wrong?
>
> Thanks a lot.
> [Message sent by forum member 'hegalor' (Michael.Decker_at_MobileXAG.de)]
>
> http://forums.java.net/jive/thread.jspa?messageID=368220
>
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>
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