AppletTalk.com Java discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  EJB3 Injection          AppletTalk.com Forum Index -> JavaBeans View previous topic :: View next topic   Author Message Henning Eiben Guest Posted: Thu Feb 08, 2007 8:10 am    Post subject: EJB3 Injection Hi, I'm currently working on my first EJB3 project (actually my first project involving EJB at all). So I wrote an entity bean and a statless bean. So far so good. Then I wrote a servlet where I want to use my session bean so I included something like at the class-scope of my Servelt: [...] public class CustomerServlet extends HttpServlet { @EJB ICustomerDispatcher customerDispatch; protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException [...] Unfortunatly this doesn't seem to work, altough I've seen this kind of code as an example on how to smoothly refer to bean. The variable "customerDispatch" is alwas null :( I also tried writing a standalone client, using the same annotation, and still ... the variable is null. Only when using something like: Context context; ICustomerDispatcher customerDispatch; try { context = new InitialContext(); customerDispatch = (ICustomerDispatcher) context.lookup(CustomerDispatcherBean.class.getSimpleName() + "/local"); } catch (NamingException e) { e.printStackTrace(); throw new RuntimeException(e); } I get my dispatcher-inctance. Could anyone give me some advice what's going wrong? Thx! Back to top Per Newgro Guest Posted: Thu Feb 08, 2007 4:02 pm    Post subject: Re: EJB3 Injection Hallo Henning Eiben, Please refer to the ejb 3 spec chapter 3.4 There you can see that there are to ways JNDI-Lookup Dependency injection You have to provide one way! Cheers Per Back to top Henning Eiben Guest Posted: Thu Feb 08, 2007 9:41 pm    Post subject: Re: EJB3 Injection Per Newgro schrieb: Quote: Please refer to the ejb 3 spec chapter 3.4 There you can see that there are to ways JNDI-Lookup Dependency injection You have to provide one way! ?? Well, didn't I do so? I wanted to use dependency injection, that's why I included: @EJB ICustomerDispatcher customerDispatch; in my code ... but this doesn't seem to work, since "customerDispatch" is always null. Back to top Per Newgro Guest Posted: Fri Feb 09, 2007 5:02 pm    Post subject: Re: EJB3 Injection Hallo Henning Eiben, Dependeny injection means you have to provide a setter method. @EJB ICustomerDispatcher customerDispatch; public void setCustomerDispatcher(ICustomerDispatcher d) { customerDispatcher = d; } The instance has to be assigned by container. As i said before please read the spec. That document will bring you a clear understanding of the 3.0 concepts. And if you want to use di please understand the pattern, before usage. There are many tutorials and other docs in web. Cheers Per Back to top Henning Eiben Guest Posted: Wed Feb 14, 2007 10:21 pm    Post subject: Re: EJB3 Injection Per Newgro schrieb: Quote: Dependeny injection means you have to provide a setter method. @EJB ICustomerDispatcher customerDispatch; public void setCustomerDispatcher(ICustomerDispatcher d) { customerDispatcher = d; } The instance has to be assigned by container. As i said before please read the spec. That document will bring you a clear understanding of the 3.0 concepts. And if you want to use di please understand the pattern, before usage. There are many tutorials and other docs in web. Well, I looked at the specs (ejb-3_0-fr-spec-ejbcore.pdf) and page 44 suggests that "@EJB IInterface myInstance" would be sufficient. Anyway, as you might have already noticed I quite new to EJB at all, so maybe you could point out some tutorials, that show how to use EJB, dependency injection ... Thanx! Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         AppletTalk.com Forum Index -> JavaBeans All times are GMT Page 1 of 1   Jump to: Select a forum Java Newsgroups----------------Java DiscussionsWeb-based java games comp.lang.java 3D Graphics API's for Java Java: Support and criticism Java System Announcements comp.lang.java.api JavaBeans Java and CORBA Java and Databases comp.lang.java.developer Java GUI Toolkits Java Help comp.lang.java.javascript JVM, native methods and hardware comp.lang.java.misc Java Language Programming Security and Java comp.lang.java.setup Java Software Tools comp.lang.java.tech ibm.software.java.linux  Non-English Java Newsgroups----------------Java Language (German)Language Java (Français)Java (Italian)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.