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From Christian Schneider <ch...@die-schneider.net>
Subject Re: Hello World!
Date Thu, 19 Sep 2019 13:02:06 GMT
The problem with OSGi docs is that most of the material is quite old.
Much of it does not apply to modern OSGi development anymore.

Another issue is that especially for dependency injection there are quite a
few alternatives. Every of these come with their own pros and cons.
As a beginner it is difficult to understand and decide how to start.

Karaf is a great way to start playing with OSGi as many things are readily
available and the shell and webconsole allow some nice insight into the
system. What karaf does not provide though is a good introduction into
OSGi. I tried to do so with my tutorials but they are more like explained

I planned to do a longer introduction around how to build a typical
application based on best practices .. but it is a lot of work and I never
really took on the task.

You might be interested in my recent talk about OSGi best practices.
Unfortunately in 30 minutes I was not able to really explain how to build
an application but maybe the example helps a bit.
The most interesting part there is maybe how to build bundles without xml
The new annotations that combine requirements and configs are also very
Both of these are not yet covered by much material on the web.
In the example there is a small application with an angular front end and a
jax-rs backend that can be easily installed in karaf.


Am Mi., 18. Sept. 2019 um 06:45 Uhr schrieb Julian Feinauer <

> Hi,
> it was not so much karaf (I kind of liked it from the start) it was rather
> OSGi.
> We come from spring and when I looked through all the osgi material lots
> of it seemed strange and confusing like Aries, Blueprint, DS, enRoute, ... .
> Serge helped me a lot with sorting the things in my head and getting all
> clear (also with bundle vs. feature vs. feature-repo) and DS stuff and lots
> more.
> So I think Karaf is already doing an excellent job its rather the OSGi
> world that is damn confusing and one thing that probably could help is a
> small OSGi introduction or something.
> I hope that helps!
> Julian
> Am 16.09.19, 11:47 schrieb "Jean-Baptiste Onofré" <jb@nanthrax.net>:
>     By the way, Julian, I'm curious. Why did you consider Karaf "hard for
>     you to adopt" ? It's to understand what we can improve (maybe
>     message/website, example, whatever) in the project to change that !
>     Thanks !
>     Regards
>     JB
>     On 16/09/2019 18:21, Julian Feinauer wrote:
>     > Hi everybody,
>     >
>     > my name is Julian and as I’m new on this list, I just wanted to
> shortly introduce myself. I’m a contributor to some Apache projects (PLC4X,
> IoTDB, Calcite) and I met some karaf folks at the ApacheCon in Las Vegas (I
> was the guy hanging around introducing JB and Serge).
>     > I have Karaf on my radar for quite some time but always considered
> it to hard for us to adopt.
>     >
>     > But, as Serge gave me an awesome hands on introduction yesterday, I
> feel like we should really start to work with it and see how it goes. So,
> expect some mails from me here or on user@.
>     >
>     > Best
>     > Julian
>     >
>     --
>     Jean-Baptiste Onofré
>     jbonofre@apache.org
>     http://blog.nanthrax.net
>     Talend - http://www.talend.com

Christian Schneider

Computer Scientist

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