More information about the ejb-ref element of ejb-jar.xml

Hello,
I am currently studying ejbs and I came across the ejb-ref element of the ejb-jar.xml file. I am in reference to O'Reilly Entreprise JavaBeans book. The book says that, thanks to the ejb-ref element it is possible to access one ejb from another ejb with the following client code:
InitialContext jndiContext = new InitialContext();
Object ref = jndiContext.lookup("java:comp/env/ejb/ProcessPaymentHomeRemote");
ProcessPaymentHomeRemote home = (ProcessPaymentHomeRemote) PortableRemoteObject.narrow(ref, ProcessPaymentHomeRemote.class);I thought one could invoke the above client code without the ejb-ref element being present in the ejb-jar.xml... I am right or wrong?
Then why the need for the ejb-ref element? Can anyone give me a concrete example of usage of the ejb-ref element where the ejb-ref element really is useful? What are the advantages of using the ejb-ref element?
Thanks in advance,
Julien Martin.

Hi Julien,
The main reason is portability. It's true that in many J2EE implementations it is possible to access an EJB's Home object without going through the component context (java:comp/env), but all such approaches are NOT portable. In the J2EE programming model, all resource access is made via the private component namespace. Using this level of indirection allows the bean developer to code the application without having to know which physical resource will be used at runtime. Each J2EE implementation can use a different scheme to identity physical resources, so by sticking to logical references in your code, you guarantee portability. Finally, you have the advantage that you can change which physical resource is mapped at deployment time without having to change your code.
So, the bottom line is, whenever you have any J2EE component (ejb, servlet, jsp, Application Client) that looks up an ejb, data source, queue, connection factory, etc., always use the environment reference type that J2EE defines for it and look it up via java:comp/env.
--ken
Kenneth Saks
J2EE SDK Team
SUN Microsystems

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AdobePDFViewer: Version: 11.0.07 - SDK 10.6 [Support]
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QuickTime Plugin: Version: 7.7.3
JavaAppletPlugin: Version: Java 8 Update 25 Check version
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Flash Player [Support]
Flip4Mac WMV [Support]
GoToMyPC Preferences [Support]
Java [Support]
Trusteer Endpoint Protection [Support]
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 1% mds
 0% fontd
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112 MB com.avast.daemon
94 MB com.apple.WebKit.WebContent
56 MB spindump
52 MB mds_stores
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479 MB Free RAM
1.56 GB Active RAM
1.11 GB Inactive RAM
904 MB Wired RAM
5.37 GB Page-ins
75 MB Page-outs
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Posted the entire text from the error window, when trying to update, using the normal NON-TECHIE way to update any and all Adobe CC products, via the Creative Cloud updater installed when Adobe Creative Cloud subscription was purchased when first offered.
The following occurs, ad nauseam:
There was a problem updating InDesign CC
For more information see the specific error below.
Update Failed
Download error. Press Retry to try again or contact customer support.(49)
Here's the crux of my frustration:
(1) Customer Service is NOT contact-able, to receive LIVE help.
(2) There is NO way for me to mitigate this "Download error", being a student learning InDesign, and NOT in any way capable of tweaking folders/files here and there.
Therefore, the real question:
Given that a significant number of subscribers are having the above referenced issue with attempting to download the current update for InDesign, WHAT ARE WE SUPPOSED TO DO, in order to get our contractually paid-for updates to our legally and contractually paid-for Adobe software, specifically in my case, InDesgin's current update?
Please, NO TECHNICAL mumbo-jumbo which most likely will cause the overwhelming majority of users, like me, to seriously corrupt their computer files, but rather an honest, straightforward "what to do" from real CS/Engineers working for Adobe, as to how to FIX this issue, period.
===========================================================
UPDATE:
Here is a way in which I think I was able to "update" my InDesign CC application:
(1) Sign-In to your Adobe Account
https://www.adobe.com/
(2) Click on the MENU icon
(3) Click on the product InDesign icon
Your browser should display the page for Adobe InDesign CC
https://www.adobe.com/products/indesign.html?promoid=KLXLU
(4) Click on the Download icon,
Your browser should now display the page to download InDesign,
https://creative.adobe.com/products/download/indesign
(5) a Pop-Up window should open, and display:
Launch Application
This link needs to be opened with an application.
with the first option to select being the CreativeCloud(URIHandler)
(5) Select this application and click OK.
What happened when I followed steps (1) thorugh (5) is that:
(a) InDesign CC(2014) was installed,
(b) InDesign CC, updated, and then
(c) InDesign CC(2014), also updated.
Why this all worked, is a mystery to me.
Looks like a separate, "new" version of InDesign, InDesign CC(2014), was installed, the existing "old" InDesign was updated, and then the newly installed Indesign CC(2014) was further updated.
A BIT MORE, when I launched my InDesign CC app, and checked to see if there were Updates Available, there in fact was an Adobe InDesign CC 64 bit (9.2.2) update.
I clicked on UPDATE and my "old" InDesign CC app was "successfully updated."
FURTHER INFO: I may have neglected to list some important info ... OS: Windows 8.1 Pro with Media Center, 64-bit
Confused, I am able to launch BOTH of these apps, and hopefully I may use one of these versions of the InDesign CC app, to do some InDesign work.
Will keep y'all posted!
Message was edited by: Richard Yapkowitz, about an hour after I first posted this issue.

Jackdan error 49 indicates the installer was unable to access a critical file or directory. You can find additional details at Error downloading Creative Cloud applications - http://helpx.adobe.com/creative-cloud/kb/error-downloading-cc-apps.html.

More information about the ejb-ref element of ejb-jar.xml

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