I believe the issue is that you are exporting from the system bundle,
plus your bundle contains the same packages as you are exporting from
the system bundle.
So, you have to make sure only one copy is being used. I think your
bundle was only exporting osgiServices.vehiclePushService. This means
your bundle will always get its own copy, since it doesn't import the
package too. If you import it too, then it would likely get wired to the
system bundle's export, since resolved packages are preferred and the
system bundle will be resolved first.
As I mention in my other message, one way around this is in your
embedded mode, add the shared packages to the boot delegation property
to get them to always load from the class path. Note, if you are using
trunk you will need to set a new property to boot delegate to the app
class loader (org.osgi.framework.bundle.parent=app).
-> richard
On 7/14/09 3:55 PM, Markus Michel wrote:
Some weeks ago I tried to use this instructions to get my embedded felix
instance working, but it didn't worked. Afterwards some guy on
stackover.comgave me the hint to put the whole package to the system
packages path. If I
strictly follow the wiki entry the line within my intialization block should
look like:
configMap.put(FelixConstants.FRAMEWORK_SYSTEMPACKAGES_EXTRA,
"osgiServices.vehiclePushService; version=1.0.0");
<path to the service includings it's implementation within the host app>
But if the entry only contains this value, I'm getting the class loading
error again.
Sorry, but I think that I have some problems in understanding the
explanations on that site completely. As far as I understood it all packages
within this property should be executed by the some class loader, which is
used for the system bundle and all other bundles. Therefore there shouldn't
occur any class loading problems, when the bundle tries to access the
service. Am I wrong? Maybe you can give me a more detailed explanation ...
Unfortunately the felix environment has to run in the embedded mode within
my program, because I want to run and control several osgi instances at
once. I hope that we will be able to solve my problem ...
BR,
Markus
2009/7/14 Richard S. Hall<[email protected]>
You should read:
http://felix.apache.org/site/apache-felix-framework-launching-and-embedding.html
It gives some pointers to running with an embedded framework instance. In
short, your app and all bundles should go through the class path (i.e.,
system bundle) for any packages shared between the host app and the bundles.
To make sure this happens, you could actually put the host/bundle shared
packages on the boot class path property to make sure everyone gets the same
ones, no matter how the bundles are wired internally. This at least has the
benefit that your bundles will work properly when not used in the embedded
situation.
I knew there was more than what met the eye here. :-)
Embedded mode is alluring to a lot of people coming to OSGi, but there are
lots of hidden issues with it, so better to avoid it if you can.
-> richard
On 7/14/09 1:53 PM, Markus Michel wrote:
You are right. If I remove that line, I'm able to load the event admin
service. But the problem is that I cannot remove it, because other parts
of
my program depends on that information: My "vehiclePushService" is mostly
implemented (and started) within the host application but some parts are
implemented within the bundle. If I do not add "vehiclePushService" to
that
line, I'm getting the class loading exception
java.lang.ClassCastException:
osgiServices.vehiclePushService.VehiclePushServiceImpl cannot be cast to
osgiServices.vehiclePushService.VehiclePushService
, when the bundle tries to use the service. Maybe I have to add the event
admin service to that line, too?!?
BR,
Markus
-----
Markus,
Yes, I believe your embedded configuration is the issue. Why are you doing
this:
configMap.put(FelixConstants.FRAMEWORK_SYSTEMPACKAGES_EXTRA,
"osgiServices.vehicleCommunicationService;
osgiServices.vehiclePushService;
vehiclePushService; vehicleCommunicationService");
?
It seems like this is incorrect, since your bundle contains these
packages.
Try removing this and see what happens.
Hi Richard!
Here's the bundle which tries to use the felix event admin service. If you
wish I can provide you the sources of the bundle, too.
If you want to use the bundle, you have to load the following bundles:
org.apache.felix.shell-1.2.0.jar
org.apache.felix.shell.tui-1.2.0.jar
org.apache.felix.eventadmin-1.0.0.jar
VehiclePushService_1.0.0.jar
Some minutes ago I noticed that the bundle can be loaded successfully if
you
run it directly from a command-line-based felix instance. The error only
occures if you try to run it
as an embedded version. Very confusing.
Maybe there's something wrong with the configuration of my felix instance:
private void initialize()
{
// create new map for storing the felix configuration properties
configMap = new HashMap<String, Object>();
// export the host provided service interface package
configMap.put(FelixConstants.FRAMEWORK_SYSTEMPACKAGES_EXTRA,
"osgiServices.vehicleCommunicationService;
osgiServices.vehiclePushService;
vehiclePushService; vehicleCommunicationService");
// add autoactivator that specifies all services that shall be
loaded together with the system bundle
List<Object> list = new ArrayList<Object>();
list.add(new AutoActivator(configMap));
// create service activators
vehicleCommunicationServiceActivator = new
VehicleCommunicationServiceActivator(connection);
list.add(vehicleCommunicationServiceActivator);
vehiclePushServiceActivator = new VehiclePushServiceActivator();
list.add(vehiclePushServiceActivator);
// add service activators to felix instance
configMap.put(FelixConstants.SYSTEMBUNDLE_ACTIVATORS_PROP, list);
// set felix-cache folder
configMap.put("org.osgi.framework.storage", "felix-cache/" + id);
}
BR,
Markus
-------
2009/7/14 Richard S. Hall<[email protected]>
I don't see anything that immediately looks incorrect. If you want to
send
me your bundle (privately) with the steps to reproduce, I will look at
it.
-> richard
On 7/14/09 4:20 AM, Markus Michel wrote:
Hi Richard!
Of course I can provide more informations. The manifest file of the
bundle
looks like this:
Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: VehiclePushService
Bundle-SymbolicName: VehiclePushService
Bundle-Version: 1.0.0
Bundle-Activator: vehiclePushService.Activator
Import-Package: org.osgi.framework;version="1.3.0",
org.osgi.service.event;version="1.1.0",
vehiclePushService
Bundle-RequiredExecutionEnvironment: JavaSE-1.6
Bundle-ClassPath: .,
vehiclePushService.jar
Export-Package:
osgiServices.vehiclePushService,
vehiclePushService
The content of the bundle looks as follows:
META-INF/
META-INF/MANIFEST.MF
hostApplication/
hostApplication/vehiclePushService/
osgiFramework/
osgiFramework/vehiclePushService/
vehiclePushService/
META-INF/.classpath
META-INF/.project
vehiclePushService.jar
vehiclePushService/Activator.class
vehiclePushService/OSGiPosition2D.class
vehiclePushService/OSGiVehicle.class
vehiclePushService/OSGiVehiclePushService.class
vehiclePushService/VehicleListener.class
vehiclePushService/VehiclePushEvent.class
vehiclePushService/VehiclePushServiceHandler.class
Because inside the plug-in dependencies org.eclipse.services is
referenced
I
think that the bundles currently uses the equinox implementation of the
eventadmin service. Later on I will try to load the equinox eventadmin
service instead
of the felix eventadmin service. Maybe it's then possible to start my
bundle
...
BR,
Markus
2009/7/13 Richard S. Hall<[email protected]>
On 7/13/09 2:47 PM, Markus Michel wrote:
Hi there!
Today I wanted to add the eventadmin service to my OSGi environment.
Therefore I extended the import block of my bundle, which is created
within
an eclipse equinox project, with org.osgi.service.event. After
loading
the
service I tried to access it by running the following command:
// get service reference to event admin service
serviceReference =
bundleContext.getServiceReference(EventAdmin.class.getName());
// check if service reference is valid
if (serviceReference != null)
{
eventAdmin = (EventAdmin)
bundleContext.getService(serviceReference);
}
But inside the if-loop I'm getting an error:
java.lang.ClassCastException:
org.apache.felix.eventadmin.impl.security.EventAdminSecurityDecorator
cannot
be cast to org.osgi.service.event.EventAdmin
I'm a little bit confused now, because I thought that the Apache Felix
framework is fully compatible to the OSGi specifications?!?
While the Felix framework isn't yet 100% compliant, it is very close
and
getting closer every release.
Isn't it
possible to mix equinox components (my bundle) with felix components
(the
eventadmin service)?
Does anybody has an idea how I can solve my problem?
Such a scenario should work, but you didn't provide enough information
to
say why it isn't. Perhaps you could show us your bundle's manifest file
as
well as a "jar tf" of the bundle.
-> richard
BR,
Markus
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