Brian Leonard's Blog

Getting Started With EJB 3.0

If you read my bio, you'll see that I have a pretty deep background in J2EE technology. However, over the past year I've been focusing on other technologies, like the eBay SDK for Java and J2ME. In the mean time, J2EE, now Java EE, has sped on past. With the forthcoming release of Java EE 5, things are changing dramatically, specifically with regards to EJBs. Last month JSR 220 - Enterprise JavaBeans 3.0 released its Proposed Final Draft, so I thought this would be a good time to reacquaint myself with the technology. Now, how hard could it be? The sole purpose of EJB 3.0 is to "improve the EJB architecture by reducing its complexity from the developer's point of view". Still, EJB 3.0 introduces the developer to lots of new concepts, like annotations, dependency injection, persistence units and entity managers to name a few.

So I started with a simple stateless session bean example from JBoss' web site. Of course, I wanted to check out the new support for EJB 3.0 coming in the next version of NetBeans, so I thought I share with you my experience.

Getting Started

• Download JBoss AS 4.0.3 and install it with the EJB 3.0 profile selected.
• Download a development build of the NetBeans IDE. Choose Java EE 5 as the release version and Daily as the release type.
• Start the NetBeans IDE and switch to the Runtime tab (Ctrl+5). Right-click the Server's node and add the JBoss Application Server 4.0.3 that you just installed.
• You now see JBoss Application Server 4.0.3 in the Server's node. Right-click the node and select Start. You'll see the output from the JBoss server log in NetBeans's Output window and the JBoss server node will have green arrow indicating that's it is running:
  
  

Fast Track

If you just want to take the project and run, extract StatelessBeans.zip. Open the project in NetBeans. Deploy the project and run Client.java.

Create the Project

1. Create a new Enterprise EJB Module project named StatelessBeans. Make sure the Server is JBoss and the J2EE version is Java EE 5.0.
2. Add a new Session Bean (Ctrl+N - look under the Enterprise category) named CalculatorBean. Set the Package to org.jboss.tutorial.stateless.bean. Select the check boxes to create both Remote and Local interfaces.
3. Expand the Enterprise Beans node of your project to see your CalculatorBean. Double-click it to open the EJB in the editor. Note that it's a simple POJO that implements two interfaces, CalculatorRemote and CalculatorLocal. Also note the @Stateless annotation. That's all that's required for the container to recognize this as a stateless session bean
   
   
   
4. Now since both the local and remote interfaces will define the same method, create a Java Interface (Ctrl+N) named Calculator that they can both extend and add the following method signatures:
   

   public int add(int x, int y);
   public int subtract(int x, int y);

5. Then update the local and remote interfaces to extend Calculator.
6. Now switch back to the CalculatorBean and place your cursor on the class declaration (with the wavy red line). Right-click the light bulb that appears to implement the local and remote interface methods.
   
   
   
7. Add the following to the body of the appropriate method:
   

       return x + y;

       return x - y;

8. And our EJB is now complete. Before we can deploy it to JBoss however, we need to change the default archive extension name from "jar" to "ejb3". Switch to the Files tab (Ctrl + 2) and open the project.properties file in the nbproject directory. Change the jar.name property from StatlessBeans.jar to StatelessBeans.ejb3 and save the file (Ctrl+S).
9. We can also delete the generated configuration files as they're empty - the container now knows what to do based on the Annotations. Switch back to the Projects tab (Ctrl+1) and expend the Configuration Files node. Delete ejb-jar.xml and jboss.xml.
10. Right-click the StatelessBeans project and choose Deploy Project. If all goes well, you'll see the following in the output window:
    
    

Create a Test Client

We'll create a simple client to test the EJB.

1. Create a new Java Main Class (Ctrl + N) named Client. Put it in the package org.jboss.tutorial.stateless.client.
2. Add the following code to the main method:
   

       InitialContext ctx = new InitialContext();
       ctx.addToEnvironment("java.naming.factory.initial", "org.jnp.interfaces.NamingContextFactory");
       ctx.addToEnvironment("java.naming.factory.url.pkgs", "org.jboss.naming:org.jnp.interfaces");
       ctx.addToEnvironment("java.naming.provider.url","localhost");
       Calculator calculator = (Calculator) ctx.lookup(CalculatorRemote.class.getName());
   
       System.out.println("1 + 1 = " + calculator.add(1, 1));
       System.out.println("1 - 1 = " + calculator.subtract(1, 1));
   

3. Press Alt+Shift+F to fix the imports.
4. The compiler's still unhappy. Place your cursor on the InitialContext line and right-click the light bulb that appears to add the throws clause for the NamingException.
   
   
   
5. Now our JBoss plug-in is missing a couple of libraries required to run this class, so we need to add them. Right-click the Libraries node of the StatelessBeans project and choose Add Library. Click the Manage Libraries button and add a New Library named jboss-aop.deployer. Add jboss-aop-jdk50.jar and jboss-aspect-library-jdk50.jar from the jboss-4.0.3\server\default\deploy\jboss-aop.deployer directory. Click OK to return to the Add Library dialog and then Add Library to add the new library to your project. You now have this library available for any future needs.
6. Run the Client (Shift+F6) and you'll see the following output:
   
   
   
   Note, to get rid of the log4j warnings, save this log4j.xml to your src/java directory and build the project.
   
   

Comments

• Hi Brian,

  I've just tried this tutorial with Netbeans 5.5 Beta 2 bundled with JBoss but it won't run as it is.

  I downloaded your zip, but when I deploy it I keep getting the error below. Is there something extra we need to do for the more recent Netbeans builds? Are you able to help?

  Thanks!
  Andrew.

  init:
  deps-jar:
  compile-single:
  run-main:
  Exception in thread "main" javax.naming.NameNotFoundException: org.jboss.tutorial.stateless.bean.CalculatorRemote not bound
  at org.jnp.server.NamingServer.getBinding(NamingServer.java:529)
  at org.jnp.server.NamingServer.getBinding(NamingServer.java:537)
  at org.jnp.server.NamingServer.getObject(NamingServer.java:543)
  at org.jnp.server.NamingServer.lookup(NamingServer.java:296)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  at java.lang.reflect.Method.invoke(Method.java:585)
  at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:294)
  at sun.rmi.transport.Transport$1.run(Transport.java:153)
  at java.security.AccessController.doPrivileged(Native Method)
  at sun.rmi.transport.Transport.serviceCall(Transport.java:149)
  at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
  at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
  at java.lang.Thread.run(Thread.java:595)
  at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:247)
  at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:223)
  at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:126)
  at org.jnp.server.NamingServer_Stub.lookup(Unknown Source)
  at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:625)
  at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:587)
  at javax.naming.InitialContext.lookup(InitialContext.java:351)
  at org.jboss.tutorial.stateless.client.Client.main(Client.java:36)
  Java Result: 1
  BUILD SUCCESSFUL (total time: 1 second)
  

  Posted by: abmyers on September 20, 2006 at 08:09 PM

• Hy. I also faced this time consuming problem with "NameNotFoundException". To resolve this problem you have to change the string

  "Calculator calculator = (Calculator) ctx.lookup(CalculatorRemote.class.getName());"
  to
  Calculator calculator = (Calculator) ctx.lookup("CalculatorBean/remote");

  in Client.java.

  Posted by: mariobalaban on June 04, 2007 at 02:43 AM

• mature old sex woman
  d cup bikini tops
  border crossing nexus
  free yahoo e greeting card
  chris daughtry myspace
  little white wedding chapel las vegas
  free background colors for myspace
  cabelas big game
  social security act title iv d
  toyota tacoma 4x4 double cab
  sex shop in los angeles
  the hun yellow page xxx
  sim city 4 pc cheat code
  alicia ass big round tit
  edge r rated superstar
  discount glasses kate spade sun
  cube dog featuring ice snoop
  contest thong
  a l p s
  andy m
  play station 2 game manual
  palm beach county sheriff
  free busty porn star
  private amateur photo
  anal porn ass
  automotive power tool
  anal sex video virgin
  free hardcore teen sex vids
  burner download dvd free software
  yahoo golf handicap tracker
  sopranos theme song lyric
  download flash game porn
  free mature picture seduced sex
  hall rental new jersey
  ed edd n eddy game
  bill clinton fox news video
  betting nascar
  naruto flash movie
  free nude male photo
  arctic cat dealer locator
  free animated wedding clipart
  current london time
  married dating
  prentice hall conceptual physics
  female cat fight
  essen germany map
  nude cartoon drawing
  hsn reward
  crime game online puzzle
  barbie costume dancing princess
  7.5 descarga detalles msn
  airport executive orlando
  fisher building city apartment
  text format resume
  enter game leave
  ass in jeans nice
  evanescence music video yahoo
  naked pete pic wentz
  bryant coupon lane outlet store
  xxx porn sex com
  aol first listen music
  airport inn miami north ramada
  foto maduras porn
  free christian blog
  cruise line job employment
  ancient greek god name
  enter game job
  ass licking milf video
  real spanking video free
  definitive definitive edition guide guide java swing

  third
  american art controversy culture history in shock

  visual
  g garvin tvone
  code ohio portsmouth zip
  snoop dog official site
  colorado loveland map
  gallery young nude woman
  gallery of anal sluts
  crate and barrel free shipping
  a3 driver mustek scanner usb
  dell axim review
  sex tip for straight woman from a gay man
  map quest .com
  fuck my big round ass
  top 100 baby name in 2005
  3d download halloween screensaver
  free hun yellow page
  dance love sexy
  porn dvd review
  english horse tack
  kari ann peniche pic
  airline malaysia mas system
  japanese anime coloring pages
  code music myspace pimp video
  paris hilton color sex tape
  home member page profile yahoo
  blow job sport
  family history local source
  2 flavor love reunion show spoiler
  new york city tax map
  map of princeton new jersey
  masturbating woman xxx
  2007 charger dodge srt8
  ask good in interview question
  music video pop n sync
  black teen pussy free video
  halo 2 game variant
  3 d download game initial
  english french translation words
  the promise glen rose texas
  ass pretty sexy
  box mail mounted residential
  amor b by jon lyric tu
  eultram xanga.com
  1973 car dodge nascar picture
  23 detroit wrestlemania wwe
  chart depth espn nba
  playboy celebrity list
  free pc puzzle game download
  news nwa
  90s r b song list
  free black pussy pic
  mack manual service truck
  mail texas yahoo.com
  old navy jobs.com
  runescape guide to make millions
  love music soft
  free live porn show
  free teen lesbian porn movie
  rate nude pic
  mary j b
  artist last name
  love hina rpg download
  jamaican slang dictionary
  944 form irs
  royal palm phoenix
  action black lesbian movie sex
  free porn black man white woman
  county of palm beach garden florida
  google.com alert
  common street drug name
  japan sex movie download
  download earth free google pro
  nyc mta express bus schedule
  dictionary online philippine tagalog
  anime monster sex
  sexy nude guys
  free xxx sex photo
  card non sport sports trading
  belong jessica lyric simpson
  howard stern fan network
  marriott marquis new york
  free rss news feed
  vancouver escort
  free gay hardcore porn video
  gambling hockey league national sports
  dmv spanish washington
  acne early pregnancy sign
  g hot rod unit
  cbs sunday morning
  used ford f 250
  code free halloween layout myspace
  easy game play puzzle sudoku
  wellsfargo.com checkcard
  male long hair style
  nfl players salary cap
  hilton hotel reno nv
  japanese school teen
  cartoon free hardcore movie
  mature porn free amateur movie
  core hard movie porn
  play n skillz the process
  background cool layout myspace
  parent teacher poem
  basenji dog picture
  activate joemicoltd mail yahoo.com
  spy cam sex video
  philippine embassy australia
  dont pain poem really sad
  b free michelle porn
  background black myspace white
  find lyric song wings
  hair length medium style wedding
  adidas tennis shoes
  natural boob sex
  free internet accelerator
  buy jel kamagra
  day love quote
  download msn messenger version 8.0
  harry potter order of the movie
  diddy p tell video
  free sex porn trailer
  seal kiss from a rose lyric
  survivor jenna sex video
  milf seeker xxx
  kc from the howard stern show
  arab free girl hot
  pitbull dog show
  tabers medical dictionary
  chip free poker
  best d lyric song tenacious tribute

  free gay porn trailer video
  exhib amateur
  bird eye view map
  xxx video forum
  ashanti lyric rain
  gay young fucking old man
  job application form free download
  jennifer lopez j lo
  cambridge history islam
  gay sex orgy
  webster online dictionary
  free group pic sex xnxx
  nude male drawing
  kansas city metro map
  nude ordinary photo woman
  by bye good good hinder lyric nothing
  forum hardware video
  free gospel lyric set
  five for fighting love song lyric
  icon marilyn monroe myspace
  halo 2 movie trailer
  california business name register
  the essential cake decorating guide essential

  cook book series
  acne back chest
  african american baby name and meaning
  2 diabetes diet drink type
  resume search texas
  corps info job knot pine
  history of the warfare of science with theology in

  christendom
  african american baby name and meaning
  cartoon free sample sex video
  daily gallery movie porn star
  budget hotel kentucky louisville
  disney euro restaurante
  lil bow wow picture
  paris hilton pic
  courtyard marriott charlotte
  golf resort in southern california
  free online poker roll tournament
  n sync music pop
  adultfriendfinder.com go p59658.subgo2
  naruto character image
  xnxx fisting gallery
  airline cheap find flight flight hotel hotel london ticket
  bank of america home personal banking
  dragon free picture printable
  yahoo india people search
  i love lucy stuff
  f m h magazine
  download free latest netscape version
  donation motorcycle used
  double foot job
  army division patch
  decor home interior magazine
  double anal penetration video
  spades card game rule
  free movie music piano sheet
  auto repair service
  marine corps uniform store
  disney channey com
  costume danica patrick
  free porn gay guys clip
  cafe internet mydsl pldt
  dog girl pharrell snoop that
  i love lucy store
  free black xxx video
  ash episode kiss may pokemon
  high musical school sound track
  over the hills and far away lyric
  setup yahoo email with outlook
  301 better garden home idea r storage stylish
  zip code map of new york state
  green joke philippine pinoy
  beta mail tutorial yahoo
  free web cam sex show
  japanese name meaning
  cbs sportsline fantasy sports
  hate love poem poetry
  6000 dell inspiron laptop
  new movie rental
  video game console uk
  adult fuck interccourse love position sex
  66 episode naruto online watch
  sears outlet ct
  playboy girl of the acc
  human male penis picture scrotum
  celebrity hair style up
  change indiana time
  online sports betting football gambling
  bow brown chris song wow
  hilton jealousy paris song
  by love lyric neyo sexy
  ciara nude photo
  free gay movie muscle video
  best joke mama vote yo
  texas hold em poker online game
  c b r
  ryctiigaloq v watch youtube.com
  luxury car rental san francisco
  gay boy love
  song lyric for love to sing
  horoscope november taurus
  member nwa
  ultrasound at 20 week pregnancy
  music player console
  d double pov
  fan fiction sakura naruto
  k ci all my life lyric
  macys dept store
  back it liar lyric one sunday take taking
  celebrity fake free porn
  banquet chicago hall in
  week 1 of pregnancy
  nasty news video
  time line of event in us history
  blue blue book book kelley kelley rv rv value value
  poem mother to son by langston hughes
  airport pa pittsburgh
  couple making love video clip
  eva fake longoria
  jesse mccartney free music download
  code jump madonna video
  new york business yellow pages
  augustana love lyric more song than
  f free m spanking story
  craigslist baltimore md
  cheat code for spider man for pc
  naruto sasuke video vs
  miami shop tattoo
  homemade anal porn
  dmv new york phone number
  cute teen love poem
  black clip gallery hairy pussy
  energy h houston l p reliant tx
  amateur porn movie home made
  antique dealer association
  driver nascar point
  back door to yahoo game pool
  charity foundation manila philippine
  antique buying cheap dealer restoring savvy selling

  tip
  anal sex trailer video
  famous poem by maya angelou
  the ascension robert w smith
  free nude female screensaver
  old yahoo toolbar
  free ware internet tv
  xxx rated sex video
  movie new something
  game playing role rpg web
  free milf porn gallery
  ca direction driving map yahoo
  interracial porn trailer
  best small dog breed
  free ware password recovery
  amateur milf movie
  manhattan ny zip code
  free image sport
  vintage sex film
  sbc yahoo com
  microsoft window media player update
  christianity short global history
  free movie of naked gay man
  ohare airport delay
  cambridge english dictionary
  blue howard iris pic stern
  group sex trailer
  free casino video poker
  free britney spears pic
  blonde tiffany teen
  lesbian online sex game
  ontario lottery result
  baby boy middle name
  adult video search engine
  rita g porn
  map of st petersburg russia
  anime boy twinks
  where to find zip code
  porn star sarah young
  black fucked getting hardcore pussy sample video
  boy download game pokemon rom
  3 administration basis r sap sap
  sexy lingerie amateur
  halloween border clip art
  add music player to web site
  better business bureau kansas city missouri
  faneuil hall in boston
  7 apple download itunes show tv
  home for sale lake tahoe nevada
  yahoo fantasy football projection
  bleeding early implantation pregnancy
  nbc universal television
  family photo studio
  define prerogative
  big boob tit fuck
  the elements of typographic style
  3 3 episode lost preview season

  Posted by: ronald45 on August 07, 2007 at 08:16 PM

This work is licensed under a Creative Commons License.