OSGi and Java EE in GlassFish - Tech Days 2010 India

1. <Insert Picture Here>
OSGi & Java EE in GlassFish
Arun Gupta, Java EE & GlassFish Guy
blogs.sun.com/arungupta, @arungupta

2. The following/preceding is intended to outline our
general product direction. It is intended for
information purposes only, and may not be
incorporated into any contract. It is not a
commitment to deliver any material, code, or
functionality, and should not be relied upon in
making purchasing decisions.
The development, release, and timing of any
features or functionality described for Oracle’s
products remains at the sole discretion of Oracle.
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3. Are you tweeting ?
#glassfish
#techdays
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4. The OSGi Alliance is a worldwide
consortium of technology
innovators that advances a proven
and mature process to assure
interoperability of applications and
services based on its component
integration platform.
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5. OSGi Alliance provides ...
• Specifications
• Reference Implementation
• Test Suites
• Certifications
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6. What is OSGi ?
• Specification delivered by OSGi Alliance
• Originally for embedded devices and networks
• Architecture for modular application development
in Java
• Reduces the cost of building, maintaining, and
deploying applications
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7. What is OSGi ?
• OSGi “container” breaks application into “modules”
or “bundles”
• Felix, Equinox, Knopflerfish
• Dependencies between each bundle are managed
• Can install, uninstall, start, and stop each bundle
dynamically without restarting container
• Multiple versions of a bundle are supported
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8. GlassFish v3 & OSGi
• No OSGi APIs are used in GlassFish
• HK2 provides abstraction layer
• All GlassFish modules are OSGi bundles
• Felix is default, also runs on Knopflerfish &
Equinox
• Can run in an existing shell
• 216 modules in v3
http://blogs.sun.com/arungupta/entry/totd_103_glassfish_v3_with 8

9. Benefits of OSGi for GlassFish
• Demands and enforces stronger modularity
• Enables custom tailored App server
• Lazy loading based on usage patterns
• Open for all JVM based technologies
• Native deployment of JRuby-on-Rails application
• Successfully maintained quick startup
• Available to GlassFish developers and
users
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10. GlassFish: The next generation platform
REST OpenMQ WebSpace Server
Scripting OpenESB OpenSSO
Web Services JMS Portal
Web Connection Java Web Services
JSF EJB Container
Application Container
Container Pooling (JCA) Persistence Interop
Management Console Update Center Management CLI
Naming Grizzly Framework Monitoring/
Injection
Service Config Deploy
Manager
Security Monitor Configuration
Cluster Serviceability/
Logging
GlassFish V3 Core
Transaction Security (Module Subsystem)
Service Service Deployment Clustering
OSGi
Java SE
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11. GlassFish v3 Runtime with OSGi
GlassFish V3 modules
GlassFish V3 modules Random OSGi Bundle
Random OSGi Bundle
(OSGi + extra metadata)
(OSGi + extra metadata)
Service OSGi
OSGi
HK2 Service layer
HK2 Service layer Mapper Service Layer
Service Layer
OSGi Bundle management
OSGi Bundle management
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12. Create an OSGi Bundle – Using Maven
• Create a Maven project
• Implement “BundleActivator”
• Update “pom.xml”
• Change packaging to “bundle”
• Add dependencies on OSGI APIs
• Use “maven-bundle-plugin” to package
• Build the bundle
http://blogs.sun.com/arungupta/entry/totd_36_deploy_osgi_bundles
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13. OSGi Bundle Management in GlassFish
• asadmin deploy –type osgi
• “cp” / “rm” glassfish/modules/autostart directory
• telnet localhost 6666
• Apache Felix Web Console
• REST Console bundle
• Perl-based shell (Osgish)
http://blogs.sun.com/arungupta/entry/totd_118_managing_osgi_bundles
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15. Why OSGi in Enterprise Apps ?
• Improved modularity
• Reusable bundles
• Dependencies are more visible
• Better isolation / Cleaner class loading model
• Better version control
• Faster deployment cycle
• Better tools for deployment
• Observable bundle life cycle
• Service Tracking
• Criteria-based service selection
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16. Why Java EE in Enterprise Apps ?
• Better API (JPA, JTA, JAXB, JNDI)
• Better component model (Servlet, EJB, JAX-RS)
• Better frameworks (JSF, CDI)
• Ease-of-use (Annotations, Convention-over-configuration)
• Platform provided integrated infrastructure services
• Transaction, Security, Persistence, Remoting, ...
• Many more reasons ...
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17. Hybrid Applications
“A hybrid application is an OSGi
bundle as well as a Java EE
archive and hence has both an
OSGi bundle context and Java EE c
ontext at runtime and can leverage
capabilities of both the platforms.”
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18. Why Hybrid Apps ?
Best of both worlds!!!
Why do you want to learn new APIs ?
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19. Role of GlassFish
• Provides a runtime for Hybrid Applications
• Implements Java EE related OSGi services and
standards
• Don't have to assemble the bits
• OSGi is no longer under the cover
• Raises visibility from GlassFish developers to users
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20. Enterprise OSGi API in GlassFish
• OSGi/HTTP Service
• OSGi/Web Application (rfc #66)
• OSGi/EJB
• OSGi/JDBC (rfc #122)
• OSGi/JPA
• OSGi/JTA (rfc #98)
Work in Progress (in trunk), some of it already in v3.
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21. OSGi/Web Application (rfc #66)
• Web Application Bundle (WAB)
• WAR + OSGi + Web-ContextPath Header
• Can use all enterprise APIs include JPA with lazy loading
• Sample manifest:
Manifest-Version: 1.0
Import-Package: javax.servlet.http; javax.persistence
Bundle-ClassPath: WEB-INF/classes/,WEB-INF/lib/entities.jar
Bundle-Version: 1.0
Bundle-ManifestVersion: 2
Web-ContextPath: /hello
Bundle-SymbolicName: test.hellowab
• Wrapped WAR Support
• webbundle: URL scheme
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22. Hybrid Applications - Demo
• OSGi services in Java EE
@Resource(mappedName=”osgiName”)
SomeOSGiService osgiService;
• JNDI Lookup
• Portable, no OSGi dependencies in application
• Exported APIs visible to Java EE apps
http://blogs.sun.com/arungupta/entry/totd_124_osgi_declarative_services
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23. Extending GlassFish v3
Using Spring dm Container
• Simple Spring bean
implementing the
service
• Invoke the service
from a servlet using
standard @Resource
injection
• Single runtime for
both Spring and full
Java EE
http://blogs.sun.com/dochez/entry/glassfish_v3_extensions_part_4 23

24. Create an OSGi bundle - NetBeans
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25. Looking Forward
• GlassFish v3
• Support OSGi-Enabled Java EE applications
• Implement Java EE-related OSGi services
• Expose Java EE services as OSGi services
• Improve underlying OSGi framework administration
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26. References
• glassfish.org
• blogs.sun.com/theaquarium
• twitter.com/glassfish
• glassfish@sun.com
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27. <Insert Picture Here>
OSGi & Java EE in GlassFish
Arun Gupta, Java EE & GlassFish Guy
blogs.sun.com/arungupta, @arungupta