Feeds

Migrating EJB 2.1 Entity and Session Beans to EJB 3.0

The nuts and bolts

Choosing a cloud hosting partner with confidence

Summary

So, to summarise this tutorial:

  • EJB development in EJB 3.0 specification is simplified by replacing abstract bean classes with POJOs.
  • Component and Home interfaces are not required in EJB 3.0.
  • Deployment descriptors are replaced with metadata annotations in the bean class. Familiarity with JDK 5.0 annotations is required to migrate EJB 2.0/2.1 to EJB 3.0.
  • The EntityManager API is used to create and find entity bean instances in EJB 3.0 instead of the create, and finder methods in EJB 2.1.
  • JNDI, which is required to obtain references to resources in EJB 2.1 is replaced with the @Resource, @Inject and @EJB annotations in EJB 3.0 specification.

Deepak Vohra is a Sun Certified Java Programmer and Sun Certified Web Component Developer. Deepak is a Web developer; and has published in XML Journal, WebLogic Developer's Journal and ONJava.com.

Intelligent flash storage arrays

More from The Register

next story
UNIX greybeards threaten Debian fork over systemd plan
'Veteran Unix Admins' fear desktop emphasis is betraying open source
Netscape Navigator - the browser that started it all - turns 20
It was 20 years ago today, Marc Andreeesen taught the band to play
Redmond top man Satya Nadella: 'Microsoft LOVES Linux'
Open-source 'love' fairly runneth over at cloud event
Return of the Jedi – Apache reclaims web server crown
.london, .hamburg and .公司 - that's .com in Chinese - storm the web server charts
Chrome 38's new HTML tag support makes fatties FIT and SKINNIER
First browser to protect networks' bandwith using official spec
Admins! Never mind POODLE, there're NEW OpenSSL bugs to splat
Four new patches for open-source crypto libraries
prev story

Whitepapers

Forging a new future with identity relationship management
Learn about ForgeRock's next generation IRM platform and how it is designed to empower CEOS's and enterprises to engage with consumers.
Cloud and hybrid-cloud data protection for VMware
Learn how quick and easy it is to configure backups and perform restores for VMware environments.
Three 1TB solid state scorchers up for grabs
Big SSDs can be expensive but think big and think free because you could be the lucky winner of one of three 1TB Samsung SSD 840 EVO drives that we’re giving away worth over £300 apiece.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.