The document discusses leveraging OSGi in Java EE business applications using JOnAS. It describes how OSGi can help build modular applications and introduces the benefits of a service-oriented approach. It also explains how hybrid applications can use the best of OSGi and Java EE, and how JOnAS is built on OSGi to provide Java EE services through an OSGi framework. This allows Java EE components and OSGi bundles to access each other's services.

1. TM TM
Leverage OSGi in Java EE business
applications with JOnAS
Guillaume Sauthier, Bull SAS
« Demonstrates how OSGiTM can help
building business applications relying on
an OSGiTM Application Server »
OW2Con 2011, November 23-24, Orange Labs, Paris.
www.ow2.org.

2. Agenda
I. Why building OSGi applications ?
II.Why do we need Java EE ?
III.Hybrid applications
IV.Best of breed application server
OW2Con 2011, November 23-24, Orange Labs, Paris.
www.ow2.org.

3. Why building OSGi applications ?
● Bundles are the building blocks
● Installable, removable, even updatable
● At runtime, dynamically
● Enables application composition (right size)
● Fine control on dependencies
(package version, …)
– Control what you actually use
– Control what you want to expose
– Avoids « classpath hell »
OW2Con 2011, November 23-24, Orange Labs, Paris.
www.ow2.org.

4. Why building OSGi applications ?
● OSGi promotes a service oriented approach
● Services are registered under a contract (API) in the
service registry
➢ Loose coupling
● Consumers require services using their contracts
● No hard dependency on a given service provider
● Services are dynamic
● Can come and go at any time
OW2Con 2011, November 23-24, Orange Labs, Paris.
www.ow2.org.

5. Why building OSGi applications ?
● Multiple and diverses component models helps
to develop pure OSGi applications
● They still are inter-operable !
● Shield developers from inherent
programmation issues with services
dynamism
● Make your choice after tasting :)
OW2Con 2011, November 23-24, Orange Labs, Paris.
www.ow2.org.

6. Why do we need Java EE ?
● Java EE skills are widely known
● Large spectrum: from presentation to data layer
– Servlet, EJB, JPA
● Data integrity
– Transaction (JTA)
● Inter-operability
– With REST and SOAP
(JAX-RS, JAX-WS)
– RMI/IIOP too (CORBA)
OW2Con 2011, November 23-24, Orange Labs, Paris.
www.ow2.org.

7. Hybrid applications [1/2]
● Hybrid applications uses the best of the OSGi
and Java EE world
● Well known Java EE programming model
– Ease of development
● A first glimpse at OSGi benefits
– Java EE components can use OSGi
services
– Java EE components are exposed
as OSGi services (EJB)
OW2Con 2011, November 23-24, Orange Labs, Paris.
www.ow2.org.

8. Hybrid applications [2/2]
● OSGi based applications can also benefits from
Java EE components
● Servlets / HttpService
● Data access layer
– Connection pooling
– JPA modeling
– Transactions support
OW2Con 2011, November 23-24, Orange Labs, Paris.
www.ow2.org.

9. Best of breed application server [1/4]
● JOnAS is it-self built on top of OSGi
● Permits right sized execution platform definition
● SOA principles applied to JOnAS technical services
maximizing testability and overall quality
● Different execution profiles can be defined
– Micro : only the kernel
– Full : All available services
– All the in-between profiles ...
OW2Con 2011, November 23-24, Orange Labs, Paris.
www.ow2.org.

10. Best of breed application server [2/4]
● As Java EE implementor, JOnAS is well suited
to provide the OSGi enterprise specifications :
● HTTP Service (Servlet)
● JDBC Service (Data access)
● JTA Service (Transaction)
● JNDI Service (Naming)
● JCA Service (Connector / Resource Adapters)
● JPA Service (High level data access)
OW2Con 2011, November 23-24, Orange Labs, Paris.
www.ow2.org.

11. Best of breed application server [3/4]
● JOnAS exposes the OSGi framework to the
Java EE applications
● OSGi services available to Java EE components
Java EE Module OSGi Bundle
EJB 3 Service Implementation
OW2Con 2011, November 23-24, Orange Labs, Paris.
www.ow2.org.

12. Best of breed application server [4/4]
● JOnAS exposes the OSGi framework to the
Java EE applications
● EJB business interfaces available to OSGi
Java EE / OSGi Module OSGi Bundle
EJB 3 Service Consumer
OW2Con 2011, November 23-24, Orange Labs, Paris.
www.ow2.org.

13. Conclusion
● Java EE programming model is here to stay
● Don't throw away your 'EJB in action' books !
● OSGi is gradually becoming more and more
important
● Apps will benefits from modularity and dynamism
OW2Con 2011, November 23-24, Orange Labs, Paris.
www.ow2.org.

14. Questions
?
jonas.ow2.org
guillaume.sauthier@ow2.org
@sauthieg
OW2Con 2011, November 23-24, Orange Labs, Paris.
www.ow2.org.

15. Thanks
● http://www.flickr.com/photos/simonk/535063371
● http://www.flickr.com/photos/frank3/6053973411
● http://www.flickr.com/photos/nicokaiser/6070196415/
● http://www.flickr.com/photos/preppybyday/5084101811/
● http://www.flickr.com/photos/ludovicpoitou/5185031866
● http://www.flickr.com/photos/twak/3688809043/
●
OW2Con 2011, November 23-24, Orange Labs, Paris.
www.ow2.org.