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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> >
>
>
> ------------------------------------------------------------------------
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