Alef Arendsen presentation at the Application Server Day 2009, discussing the latest innovations in Spring dm Server 1.0

1. The need for OSGi
and the SpringSource dm Server
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2. Who is this guy anyway?
•Alef Arendsen (Dutch)
– Co-founder of SpringSource
– Currently strategic advisor at JTeam
– Key contributor to Spring Framework
•SpringSource
– The company creating and sustaining many
open source technologies
• Spring, Integration, Web Flow, Batch, et cetera
• AspectJ, Groovy, Grails, ActiveMQ, ServiceMix
• Apache Tomcat, Apache HTTPd
– Consulting, training and support subscriptions for these
many open source technologies and other value-adds
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3. Complexity is your Enemy!
“Complexity leads to disaster. Your application should be built
around simple constructs and understandable layers, which
combine to perform complex tasks. The code itself, however,
should avoid complexity at every stage. This is much easier to
say than to do, though, since many programmers are afraid of
missing important pieces, or of oversimplifying.”
-- Justin Gehtland
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4. Toward Lean Software
“Lean software is an approach to building software that
promotes simplicity and minimizes resource usage. Forrester
analyst John Rymer says he believes the application
development industry must move to lean software as the
next development paradigm to move ahead. Lean software
could be the antidotes to bloated vendors and could be
helpful in a down economy.”
-- Daryl K. Taft – eWeek ( December 2008)
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5. Towards modular middleware
“...thus a container is no longer a fixed monolithic concept,
but a runtime infrastructure that can be assembled from
existing building blocks. There's no longer a set menu of
declarative middleware services; you can create your own
selection à la carte...”
-- Rod Johnson – J2EE without EJB (2004)
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6. Copyright 2007 SpringSource. Copying, publishing or distributi ng without express written permission is prohibited.

7. Java API 1.0.2 (9 in total)
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8. Java API 1.1.3 (25 in total)
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9. Java API 1.2 (59 in total)
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10. Java API 1.3 (76 in total)
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11. Further evolution of Java
•Java 1.4 had 135 packages
•Java 5– 166 packages
•Java 6– 203 packages
•Java 7– 204 packages (in the current beta)
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12. Spring Framework
•Spring 1.0 – 95 packages
•Spring 1.1 – 110 packages
•Spring 1.2 – 137 packages
•Spring 2.0 – 197 packages
•Spring 2.5.6 – 231 packages
•Spring 3.0 milestone 1 – 232 packages
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13. Spring Framework
•It looks like we continue to keep on
dumping stuff in there!
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14. Before we move on...
•We do seem to get more stuff done
•Spring 3.0 for example
– Introduces REST support
– Incorporates XML marshalling support
• With JiBX, JAXB, XStream
• With XMLBeans and Castor
– Introduces an expression language
•We write applications
– That are more feature-rich
– Are better to interface with
– Et cetera
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15. The types problem
•All these types do form a problem though
– Larger footprint of our applications
• Ever heard of 10 to 50 MB WAR or EAR files?
– Larger footprint of infrastructure software
• If you've ever installed
<insert-favorite-vendor>'s
application server, you know
what I mean
– With changing infrastructure
landscape this is going to form
a real problem very soon
(think cloud, et cetera)!
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16. The services problem
•Even if we fix the types problem
– We still can't seem to share services in an elegant way!
– To be able to share services
• You have to write web services
• You have to write RMI interfaces
– Redeployment of services
seems to be quite hard
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17. It's all about modularity and sharing
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18. Using OSGi to solve
•The types problem
– Export-Package: I offer types in package XYZ
– Import-Package: I need types from package XYZ
•The services problem
– <osgi:service/>: I offer a instance of a service
– <osgi:reference/> I need an instance of a service
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19. On to the IDE
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20. So what if I don't want OSGi
•Spring + Tomcat: a widely used combo
•Tomcat however does not have everything you
might need such as cluster management, diagnostics
and other monitoring and management features
•SpringSource tc Server
– The Tomcat you know
– The enterprise capabilities you need
– Nothing new to learn, just plain Tomcat + some extras
– Commercial offering, easy way to get started
(€2500,= for 4 CPUs/sockets & a training seat)
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21. Questions?
We offer training session in Milano & Roma.
Visit http://www.springsource.com/training for more info.
There are also possibilities to do a training in-house.
Further information about dm Server, tc Server and
SpringSource Tool Suite,
visit http://www.springsource.com
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