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
The "pkg" command shipped with GlassFish is platform-independent and runs on all the supported platforms. You can use the standard "pkg-get" command with OpenSolaris but that requires more options to be specified. For simplicity, we'll use the "pkg" command bundled with GlassFish as shown 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-ejb
DOWNLOAD                                    PKGS       FILES     XFER (MB)
Completed                                    1/1       11/11     0.45/0.45
PHASE                                        ACTIONS
Install Phase                                  24/24

And verify as ...

arun@opensolaris:~/glassfishv3-prelude/bin$ ./pkg list
NAME (AUTHORITY)                              VERSION         STATE      UFIX
felix                                         1.2.2-0         installed  ----
glassfish-amx                                 3.0-28.3        installed  ----
glassfish-api                                 3.0-28.3        installed  ----
glassfish-common                              3.0-28.3        installed  ----
glassfish-ejb                                 3.0-28.3        installed  ----
glassfish-grizzly                             1.8.6.2-0       installed  ----
glassfish-gui                                 3.0-28.3        installed  ----
glassfish-hk2                                 3.0-28.3        installed  ----
glassfish-jca                                 3.0-28.3        installed  ----
glassfish-jdbc                                3.0-28.3        installed  ----
glassfish-jdbc-gui                            3.0-28.3        installed  ----
glassfish-jdbc-management                     3.0-28.3        installed  ----
glassfish-jpa                                 3.0-28.3        installed  ----
glassfish-jsf                                 1.2.10-1        installed  u---
glassfish-jta                                 3.0-28.3        installed  ----
glassfish-management                          3.0-28.3        installed  ----
glassfish-nucleus                             3.0-28.3        installed  ----
glassfish-registration                        3.0-28.3        installed  ----
glassfish-scripting                           3.0-28.3        installed  ----
glassfish-web                                 3.0-28.3        installed  ----
glassfish-web-gui                             3.0-28.3        installed  ----
glassfish-web-management                      3.0-28.3        installed  ----
javadb                                        10.2.2.1-0      installed  ----
pkg                                           1.0.7-15.1269   installed  ----
pkg-java                                      1.0.7-15.1269   installed  ----
python2.4-minimal                             2.4.4.0-15.1269 installed  ----

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".

  1. Create a POJO, choose the class name as "HelloEJB" and package as "server" as shown


  2. Declare a public method "sayHello" and add @javax.ejb.Stateless annotation to mark it a stateless EJB as shown

  3. Create a new Servlet by selecting the option as shown



    and specify the name as "EJBClient" in "client" package



    and click on "Finish".
  4. In the generated Servlet, declare a dependency on the EJB using @javax.ejb.EJB as shown

  5. 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
Comments:

Arun,

this is cool stuff. Thank you for writing it down.

Greetings
Michael

Posted by Michael Johann on January 18, 2009 at 09:54 PM 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 21, 2009 at 08:48 PM PST #

Good page!

Posted by Wholesale on February 01, 2009 at 06:36 PM PST #

[Trackback] Java EE 6 makes it pretty straightforward to crunch out a basic web + database application. This semester, my software engineering class is building web apps, and I decided it is simpler to have them use JSF + JPA in Glassfish v3 rather than some techn...

Posted by Cay Horstmann's Blog on February 02, 2009 at 07:27 AM PST #

[Trackback] Java EE 6 makes it pretty straightforward to crunch out a basic web + database application. This semester, my software engineering class is building web apps, and I decided it is simpler to have them use JSF + JPA in Glassfish v3 rather than some techn...

Posted by Cay Horstmann's Blog on February 09, 2009 at 10:51 PM PST #

You were given good information. thank you

Posted by sinema izle on March 10, 2009 at 06:49 AM 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 04:04 PM PDT #

[Trackback] EJB 3.1 (JSR 318) and Servlet 3.0 (JSR 315) are the two new JSRs in Java EE 6 (JSR 316). The EJB 3.1 specification provides multiple new features such as WAR packaging, Optional Local Business Interfaces, EJB.lite, Portable Global...

Posted by Arun Gupta's Blog on May 19, 2009 at 04:00 AM PDT #

[Trackback] EJB 3.1 (JSR 318) and Servlet 3.0 (JSR 315) are the two new JSRs in Java EE 6 (JSR 316). The EJB 3.1 specification provides multiple new features such as WAR packaging, Optional Local Business Interfaces, EJB.lite, Portable Global...

Posted by Arun Gupta's Blog on May 20, 2009 at 11:15 AM 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 05:09 AM PDT #

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Arun Gupta is a technology enthusiast, a passionate runner, author, and a community guy who works for Oracle Corp.


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