Hi Alex,
The class cast exception indicates there are two different copies on
the class path. Since you did not post exactly how you started up,
I'd have to guess what's going on...
...but, I would like to ask you why you are extending Felix like
this? I see at least two other approaches that I would favor:
1) Keeping this as a bundle. What you're doing is essentially (in
OSGi speak) installing a (simple) management agent. This agent is
then responsible for installing and starting bundles.
2) Keeping it as a "bundle" that loads as part of the system bundle.
Felix has a nice mechanism to provide zero or more extensions to the
system bundle by means of providing classes that implement
BundleActivator. Package your stuff like that and my guess is it runs
without any modifications (compared to running it as 1) which is
something you've already tried.
Furthermore, if you're concerned about having to specify all kinds of
startup options to fire up this management bundle, it's fairly easy
to create a wrapper startup class that sets all options (as system
properties) and subsequently starts Felix (which will then pick those
up and auto start your "management agent" bundle that will then start
the rest).
I'm guessing you're doing this to create some kind of automated test
framework?
I would very much prefer option 1) because that is the one that is
the easiest to "port" to other frameworks.
But, this is a lot of guesswork and brainstorming, so I might not
understand the problem you're trying to solve at all. :)
Greetings, Marcel
On Aug 13, 2006, at 7:01 , Alex Karasulu wrote:
I've been trying to figure out a way to tell Felix how to
programmatically install and start bundles. My goal is to build a
simple mojo for our maven 2 plugin that will allow us to install
and start a bundle produced by a project using Felix. This idea is
to use a command like so:
mvn osgi:run
This will trigger the mojo to startup Felix, install and start the
target bundle generated by the project including any dependent
bundles.
My problem is in navigating the Felix API. I would like to avoid
using the configuration file all together and just use the API.
What I've done is extended Felix and exposed the protected
installBundle method. Next I called it to get a handle on a Bundle
and called start() on it. Here's how that code looks ...
in = new FileInputStream( "/home/akarasulu/test-bundle-1.0.0-
SNAPSHOT.jar" );
b = instance.installBundle( "file:///home/akarasulu/test-
bundle-1.0.0-SNAPSHOT.jar", in );
b.start();
Instance is the instance of the Felix subclass. When I do this I
get a ClassCastException on the BundleActivator in this simple
bundle which just prints Hello World. The bundle starts just fine
in Felix running in standard command line mode. I'm just wondering
what I'm doing wrong. Any hints or suggestions on what I'm
botching up would be great.
Here's the stack trace that I get:
Exception in thread "main" org.osgi.framework.BundleException:
Activator start error.
at org.apache.felix.framework.Felix._startBundle(Felix.java:
1261)
at org.apache.felix.framework.Felix.startBundle(Felix.java:
1149)
at org.apache.felix.framework.BundleImpl.start
(BundleImpl.java:326)
at FelixTestDriver.main(FelixTestDriver.java:65)
Caused by: java.lang.ClassCastException: test.Activator
at org.apache.felix.framework.Felix.createBundleActivator
(Felix.java:2702)
at org.apache.felix.framework.Felix._startBundle(Felix.java:
1203)
... 3 more
Thanks,
Alex
