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OSGI DEVCON 2013 COMING SOON

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November 06, 2012
OSGi DevCon 2013 once again is co-located with EclipseCon 2013 taking place in
Boston, Massachusetts, between March 25 to 28. See the OSGi Alliance
announcement for full details. The call for papers is still open until November
19, so hurry up and submit a talk. For teasers an early bird selection has been
taken: Modularity in the Cloud: a Case Study by by Paul Bakker and Marcel
Offermans from Luminis. Hop to see you next March in Boston.
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APACHE SLING 6 RELEASED

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April 18, 2011
Bringing Back the Fun Apache Sling brings back the fun to Java developers and
makes the life of a web developer much easier. It combines current state of the
art technologies and methods like OSGi, REST, scripting, and JCR. The main focus
of Sling deals with the important task of bringing your content into the web and
providing a platform to manage/update the content in a REST style. Sling is
built as OSGi bundles and therefore benefits from all advantages of OSGi. On the
development side a scripting layer (leveraging the Java Scripting API) allows to
use any scripting language with Sling (of course you can use plain old Java,
too). And on top of this, Sling helps in developing an application in a RESTful
way. As the first web framework dedicated to JSR-283 Java Content Repositories,
Sling makes it very simple to implement simple applications, while providing an
enterprise-level framework for more complex applications. Underneath the covers
Apache Jackrabbit is used for the repository ...
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TO EMBED OR TO INLINE ?

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April 11, 2011
At times you want (or need) to include third party libraries in your bundles.
You basically have two options to do that: Embed the complete library Inline the
required classes/packages (or everything) Until recently I was in the camp of
embedding the complete libraries and setting the Bundle-ClassPath manifest
header accordingly. The Embed-Dependency directive of the Apache Felix Maven
Bundle Plugin makes this extremely easy to do. Lately, though, this has been
questioned by Karl Paul's pojosr project. This project brings the OSGi Service
Registry to regular applications. The nice thing here is, that it really is a
stripped down OSGi Framework basically removing the modularity pillar. The
drawback is that this causes the Bundle-ClassPath manifest header and embeddeded
libraries to not be supported. Thus to run your regular bundle inside pojosr,
you will have to inline all third party libraries instead of embedding them. The
upside is that this really works. For example the Apac...
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CLASS.FORNAME ? PROBABLY NOT ...

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Dezember 10, 2010
After subscribing to the OSGi Planet feed I felt like starting to read some old
blog posts and stumbled upon a series of posts by BJ Hargave around the issues
of the Eclipse ContextFinder caused by the Class.forName methods. For the full
story please go and read Class.forName caches defined class in the initiating
class loader (and folow the links !). So, these posts caused me to try and look
how we behave in Apache Sling ... and of course hoped we would be clean. Well,
hmm, turns out we are not ... I found nine classes using Class.forName . So we
probably have to clean this up. Maybe or maybe not, these uses may be the cause
for some strange failures we had over time. I cannot really tell. But I cannot
exclude this possibility either. BTW, this is what I did to find the classes: $
find . -name "*.java" -exec fgrep -l Class.forName {} \;
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ON VERSION NUMBERS

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Oktober 15, 2009
I have been thinking about using version numbers lately while working on some
API extension of the Sling Engine bundle. So here is what I think versions are
all about and that we all should be very careful when changing code and
assigning versions to it. On a high level versions have various aspects: Syntax
There is no global agreement on the correct syntax of versions. I tend to like
the OSGi syntax specification: The version has four parts separated by dots. The
first three parts are numbers, called the major, minor and micro version. The
fourth part is a plain (reduced character set) string which may be used to
describe a particular version. Version numbers are compared as you would expect,
except that the fourth part is employs case-sensitive string comparison
comparing the actual Unicode codepoints of the characters. Semantic The
semantics of a version define what it means to increment each place of a
version. In the world of software development there is even less agreemen...
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READY TO SERVE REQUESTS ...

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April 17, 2009
In the Apache Sling project we have an interesting problem : Knowing when the
application has finished its startup. Coming from a background of a traditional
application, you know when the system has finished its startup. For example, a
servlet container knows it has finished the startup, when all web applications
have been started. In Apache Sling, the situation is a bit different: Apache
Sling is an extensible system, where extensions may simply be added by adding
more bundles. "Easy", you say, "just wait for all bundles to have been started
and you know when the application is ready". True, but there is a catch. To
extend Apache Sling, you register services with the OSGi registry. "Still easy",
you might say. Right, if the services are all started by bundle activators, we
still can depend on having all bundles started for the system to be ready.
Again, this is only part of the story: Some services depend on other services.
So the dependent services may...
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DEPENDENCY INJECTION IN OSGI

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April 17, 2009
The OSGi framework and its compendium services provide a whole lot of fun to
build applications. Defining bundles is a cool stuff to cut the big job into
pieces and enjoy the coolness of separation of concerns just like the old Romans
said: Divide et Impera ! One interesting compendium specification is the
Declarative Services Specification. This specification tries and IMHO succeeds
very well to bring some of the cool stuff of Spring, namely Dependency
Injection, into the OSGi world. Just like the application descriptors in Spring
you have component descriptors in Declarative Services. Using a component
descriptor, you define the following properties of a component: The name of the
component and whether it is activated immediately or not Whether the component
is a service and the service interfaces to register the component with Which
other services are used by the component. These services may be injected (bound
in OSGi speak) or may be looked up. There is also the notion of mandator...
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ARCHIV

 * 2012 1
    * November 1
       * OSGi DevCon 2013 coming soon

 * 2011 2
    * April 2
      

 * 2010 1
    * Dezember 1
      

 * 2009 3
    * Oktober 1
      
    * April 2
      

 * 2008 3
    * Oktober 3
      

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LABELS

 * Apache Sling
 * Bundle
 * Cache
 * ClassLoader
 * Client
 * Declarative Services
 * Dependeny Injection
 * DevCon
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 * Extension

 * Framework
 * Framework-Host
 * LinkedHashMap
 * LRU
 * Maven
 * OSGi
 * Package
 * Sling
 * Version

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