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From "Bernd Fondermann" <bernd.fonderm...@googlemail.com>
Subject Re: OSGi: First steps with Knopflerfish
Date Sat, 30 Sep 2006 09:09:49 GMT
Great. As far as I understand it, Knopflerfish works. Now, how is that
related to James? :-)
Are you planning to deploy James to it, now?

I am very looking forward to trying some other container, but it is
inevitable to decouple our components from the current container, at
first.

So long,

  Bernd

On 9/30/06, Joachim Draeger <jd@joachim-draeger.de> wrote:
> Hi!
>
> It's a bit easier to discuss things when you know your enemy, so I tried
> out Knopflerfish.
>
> Why Knopflerfish?
>
>  * fancy desktop interface
>  * eclipse plugin
>  * many included bundles
>  * some kind of convenient
>  * seems to be quite active
>  * there is some documentation
>
> So this is not a vote against Felix. I'm quite convinced that James
> should ship with Felix when we would move to OSGi. But for first
> development Knopflerfish seems to be an easier starting point.
> And an OSGi compliant app should run in both.
>
> Following A Tutorial
>
> I downloaded the full-distro and followed the following tutorial
> http://www.knopflerfish.org/tutorials/osgi_tutorial.pdf
> using the eclipse plugin in parallel.
> The learning-curve was really flat and it didn't took much time to get
> the first examples running.
> This tutorial seems to be quite useful too:
> http://oscar-osgi.sourceforge.net/tutorial/
>
> The Eclipse Plugin
>
> For the plugin you have to setup the preferences to define which
> framework you want to use:
> http://www.knopflerfish.org/eclipse_preferences.html
>
> Sometimes the plugin has some edges and is a bit tricky but it is all in
> all very useful. It lets you:
>
>  * configure your bundle manifest
>  * automatically build your bundle to the out/ directory
>  * OSGi requires you to define the packages you want to use. The plugin
> sets the classpath accordingly, so you can't forget.
>  * run/debug everything inside eclipse
>
> You can add additional bundles to your eclipse run configuration to have
> access to a console or even the desktop.
> One problem I ran into was adding xml files to the bundle. It is
> configured to only include .java/.class by default.
>
> 1. in Project/Proterties/Java Build Path/Source: Indluded **/*.xml
> 2. you have to manually edit .bundle-pack
>
> <?xml version="1.0" encoding="UTF-8"?>
> <bundlejar>
> <resource dst="" pattern=".*\.xml|.*\.class"
> src="/fms_mailgenerator/out" type="0"/>
> </bundlejar>
>
> Adding an additional <resource> tag didn't work, it was ignored.
>
> Knopflerfish Desktop
>
> Using the Knopflerfish Desktop is great when you want to try out
> starting/stopping/install/update/remove bundles. Using the mouse is
> really convenient here and it is as easy as running inside eclipse if
> you don't need debugging.
>
> Once you started Knopflerfish by something like java -jar framework.jar
> you can simply add your just created bundles from
> workspace/your-bundle/out/your-bundle-1.0.0.jar
> and play around with starting and stopping. And when you have changed
> something in eclipse you simply press the "Update Bundle" because the
> bundle in out/ is always up-to-date!
>
> Now try on your own! :-)
>
> Joachim
>
>
>
>
>
>
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