Hi Justin, I am attempting to utilize the ScrService from a host application. In order to use this service, I have used the following as a guide. http://felix.apache.org/site/apache-felix-framework-launching-and-embedding.html
Here is an excerpt... "The main complication for the host application using a service from a bundle is the fact that both the host application and the bundle must be using the same class definitions for the service interface classes. Since the host application cannot import classes from a bundle, this means that the service interface classes must be accessible on the class path, typically as part of the host application itself. The host application then must export the service interface package via the system bundle so that bundles installed into the embedded framework instance can import it. This is achieved using the org.osgi.framework.system.packages.extra configuration property previously presented." Similarly, Neil Bartlett states the following in his blog entry on embedding OSGi..." You can publish a service from the System Bundle (i.e., the host application) and consume it from the bundles, OR you can publish a service from the bundles and consume it from the host application. The only limitation is that the service API (that is, the abstract Java interfaces) are exported by the System Bundle." (from http://njbartlett.name/2011/03/07/embedding-osgi.html) As I stated, this works fine for accessing the EventAdmin service, but not so for the ScrService. If this strategy is incorrect, do you have any guidance? Cheers, Patrick -----Original Message----- From: Justin Edelson [mailto:[email protected]] On Behalf Of Justin Edelson Sent: Wednesday, November 16, 2011 8:17 PM To: [email protected] Subject: Re: Embedded Felix ScrService ClassCastException Where is it documented to put the SCR bundle on the host app classpath and export it from the system bundle? That seems totally wrong and would make sense as the source of this issue. Justin On Nov 16, 2011, at 12:35 PM, "Conreaux, Patrick" <[email protected]> wrote: > Hi, > > I have encountered the following ClassCastException while attempting to cast > the ScrService object (from a ServiceTracker) in my host app. > Following the documented procedure, I have put the SCR jar on the host > app classpath and exported the org.apache.felix.scr package via the > org.osgi.framework.system.packages.extra property. > > java.lang.ClassCastException: > org.apache.felix.scr.impl.config.ConfigurationComponentRegistry cannot > be cast to org.apache.felix.scr.ScrService > > Using a similar approach, I can successfully obtain and cast the EventAdmin > service. > Also, I am successful if I instead list the the org.apache.felix.scr package > in the org.osgi.framework.bootdelegation property. > However, this is not the desirable solution as it breaks modularity. > > Any ideas? > > Installed bundles are the following: > org.apache.felix.shell-1.2.0.jar > org.apache.felix.scr-1.6.0.jar > org.apache.felix.configadmin-1.2.4.jar > org.apache.felix.eventadmin-1.2.14.jar > > Cheers, > Patrick > > --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
