Arun Gupta, Miles to go ...
Arun Gupta is a technology enthusiast, a passionate runner, and a community guy who works for Sun Microsystems.
Monday January 19, 2009
EJBs in a WAR - Simplified packaging defined by EJB 3.1, Available in GlassFish v3
The EJB 3.1
specification says:
An enterprise bean class
with a component-defining annotation defines an enterprise bean
component when packaged within the WEB-INF/classes directory or in a
.jar file within WEB-INF/lib.
In simple English it means, an EJB can be a POJO annotated with EJB
annotations (such as @javax.ejb.Stateless) and bundled within
WEB-INF/classes inside a WAR.
This feature is available in GlassFish v3 for some
time now.
Imagine the ramifications, you now have Container Managed Persistence,
Transacations, Security, and all other standard benefits of EJB - only
this time in a WAR file.
The default configuration of GlassFish v3 Prelude does not include an
EJB container. Lets first install it!
The EJB container in GlassFish v3 Prelude can be installed in couple of
ways:
- Using Update Center as described here.
- Or using the "pkg" command which is described below
| arun@opensolaris:~/glassfishv3-prelude/bin$ ./pkg The software needed for this command (pkg) is not installed. When this tool interacts with package repositories, some system information such as your system's IP address and operating system type and version is sent to the repository server. For more information please see: http://wiki.updatecenter.java.net/Wiki.jsp?page=UsageMetricsUC2 Once installation is complete you may re-run this command. Would you like to install this software now (y/n): y Install image: /export/home/arun/glassfishv3-prelude/bin/.. Installing pkg packages. Installing: [pkg:/pkg@1.0.7,0-15.1269:20081008T211255Z, pkg:/python2.4-minimal@2.4.4.0,0-15.1269:20081008T211307Z] Initialization complete. Software successfully installed. You may now re-run this command (pkg). |
Install the EJB container as:
arun@opensolaris:~/glassfishv3-prelude/bin$ ./pkg install glassfish-ejbDOWNLOAD PKGS FILES XFER (MB) PHASE ACTIONS |
And verify as ...
arun@opensolaris:~/glassfishv3-prelude/bin$ ./pkg listNAME (AUTHORITY) VERSION STATE UFIX |
As shown above, "glassfish-ejb" module with version "3.0.28.3" is now installed.
Now your GlassFish v3 Prelude is ready to serve EJBs!
Next, lets create a simple web application and package EJB there. Using the NetBeans IDE, create a template Web application. Lets say the project is named "ReallySimpleEJB".
- Create a POJO, choose the class name as "HelloEJB" and
package as "server" as shown
- Declare a public method "sayHello" and add
@javax.ejb.Stateless annotation to mark it a stateless EJB as shown
- Create a new Servlet by selecting the option as shown
and specify the name as "EJBClient" in "client" package
and click on "Finish". - In the generated Servlet, declare a dependency on the EJB
using @javax.ejb.EJB as shown
- Invoke the EJB by uncommenting the code in "processRequest"
method and add "ejbClient.sayHell("Duke")" invocation as shown:
If the application is pre-deployed then saving this file will auto-deploy it as shown in screencast #27. Otherwise right-click on the project and select "Deploy".
And finally invoking the servlet at "http://localhost:8080/ReallySimpleEJB/EJBClient" shows the following output:
EJBs in a WAR - simple and easy to use :)
Download GlassFish v3 Prelude and get started!
Technorati: glassfish v3 ejb netbeans war ear
Posted by Arun Gupta in General | Comments[10]
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This is a personal weblog, I do not speak for my employer.
Arun,
this is cool stuff. Thank you for writing it down.
Greetings
Michael
Posted by Michael Johann on January 19, 2009 at 05:54 AM PST #
What, no XML configuration? It can't be for the enterprise then. *grin*
Just kidding, great stuff. The EJB 3.1 & Glassfish team is really on to something here.
Posted by Jacek on January 22, 2009 at 04:48 AM PST #
Good page!
Posted by Wholesale on February 02, 2009 at 02:36 AM PST #
Posted by Cay Horstmann's Blog on February 02, 2009 at 03:27 PM PST #
Posted by Cay Horstmann's Blog on February 10, 2009 at 06:51 AM PST #
You were given good information. thank you
Posted by sinema izle on March 10, 2009 at 01:49 PM PDT #
What, no XML configuration? It can't be for the enterprise then. *grin*
Just kidding, great stuff. The EJB 3.1 & Glassfish team is really on to something here.
Posted by Warhammer Online Gold on March 11, 2009 at 11:04 PM PDT #
Posted by Arun Gupta's Blog on May 19, 2009 at 11:00 AM PDT #
Posted by Arun Gupta's Blog on May 20, 2009 at 06:15 PM PDT #
Hi, Thanks for the example.
I am a newbie to the glassfish v3 prelude, and trying to see if I can follow your example in my own development env.
The code itself is pretty simple, but I am having trouble to figure out what are the jar files needed to make the code to compile.
In prev. glassfish version (v2.1), I can include javaee.jar and appsver-rt.jar make my both server and client code happy.
Now with v3 prelude, it seems to me that appsver-rt.jar is gone.
What should I use to make the project build. BTW, I don't use NetBean.
If you can publish the simple ant build scripts, that will help to clarify my questions.
thanks
Chester
Posted by Chester Chen on July 16, 2009 at 12:09 PM PDT #