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From Christian Schneider <ch...@die-schneider.net>
Subject Re: Adding an @Activate to a DS bundle causes the bundle not to load
Date Tue, 05 Dec 2017 09:27:06 GMT
The requirement
osgi.service; effective:=ac
 tive; filter:="(objectClass=org.osgi.service.jdbc.DataSourceFactory)
expresses that your bundle needs a service of this type. The resolver then
checks if any other bundle in your feature:install provides the capabiltiy.
It is not actually checking if the service is created. It just works on
requirement / capability level.

In karaf you can define the Provide-Capability in a feature. If you do this
in your own feature then you can kind of negate the requirement that is
added to your bundle.
The better way to handle this is to make the bundle that provides the
DataSourceFactory provide the capability or to let the feature that loads
this bundle provide the capability.

Christian


2017-12-05 0:01 GMT+01:00 Tim Ward <tim.ward@paremus.com>:

> My educated guess...
>
> By adding the activate method you have increased the required version of
> DS detected by bnd. This, in turn, has probably added a Require-Capability
> for the service that you import. This has no effect at runtime (due to the
> value of its effective directive) but if the service exporter does not have
> a corresponding Provide-Capability then it may have broken the Karaf
> feature resolver, which would stop your feature from deploying with the
> error that you see
>
> In bnd you can fix this using repository augments (as it’s only a
> resolve-time issue). I don’t know whether Karaf has a similar feature.
>
> The other fix is to make sure that your Postgres driver correctly
> advertises its service capabilities using Provide-Capability.
>
> Tim
>
> Sent from my iPhone
>
> > On 4 Dec 2017, at 22:15, Steinar Bang <sb@dod.no> wrote:
> >
> > Platform: Java 1.8, karaf 4.1.3
> >
> > I have the following DS component that exposes a Servlet to the Pax Web
> > Whiteboard Extender:
> > https://github.com/steinarb/sonar-collector/blob/master/
> sonar-collector-webhook/src/main/java/no/priv/bang/sonar/
> collector/webhook/SonarCollectorServlet.java#L55
> >
> > The component starts fine, and exposes a Servlet service that is picked
> > up by the whiteboard extender, and as far as I can tell, it does what it
> > is expected to do (receive POSTs from SonarQube/SonarCloud and store
> > build statistics in a PostgreSQL database).
> >
> > However, if I add an empty activate method, like so:
> > @Component(service={Servlet.class}, property={"alias=/sonar-collector"}
> )
> > public class SonarCollectorServlet extends HttpServlet {
> >     ...
> >     @Activate
> >     public void activate(Map<String, Object> config) {
> >     }
> >     ...
> > }
> >
> > then the component fails to load, because of missing dependencies:
> > karaf@root()> feature:repo-add mvn:no.priv.bang.sonar.sonar-
> collector/sonar-collector-webhook/LATEST/xml/features
> > Adding feature url mvn:no.priv.bang.sonar.sonar-
> collector/sonar-collector-webhook/LATEST/xml/features
> > karaf@root()> feature:install sonar-collector-webhook
> > Error executing command: Unable to resolve root: missing requirement
> [root] osgi.identity; osgi.identity=sonar-collector-webhook;
> type=karaf.feature; version="[1.0.0.SNAPSHOT,1.0.0.SNAPSHOT]";
> filter:="(&(osgi.identity=sonar-collector-webhook)(type=
> karaf.feature)(version>=1.0.0.SNAPSHOT)(version<=1.0.0.SNAPSHOT))"
> [caused by: Unable to resolve sonar-collector-webhook/1.0.0.SNAPSHOT:
> missing requirement [sonar-collector-webhook/1.0.0.SNAPSHOT]
> osgi.identity; osgi.identity=no.priv.bang.sonar.sonar-collector-webhook;
> type=osgi.bundle; version="[1.0.0.SNAPSHOT,1.0.0.SNAPSHOT]";
> resolution:=mandatory [caused by: Unable to resolve
> no.priv.bang.sonar.sonar-collector-webhook/1.0.0.SNAPSHOT: missing
> requirement [no.priv.bang.sonar.sonar-collector-webhook/1.0.0.SNAPSHOT]
> osgi.service; effective:=ac
> > tive; filter:="(objectClass=org.osgi.service.jdbc.DataSourceFactory)"]]
> > karaf@root()>
> >
> > If remove the "@Activate" annotation, the component loads again.
> >
> > Does anyone know what might cause this?
> >
> > What's strange about this, that the missing depenency the error message
> > complains about, ie. org.osgi.service.jdbc.DataSourceFactory, is
> > essential to the servlet's operation.  Without a DataSourceFactory, no
> > database can be contacted and no data can be saved (and data _is_ saved).
> >
> > Is the error message because the bundle can't find the type
> > org.osgi.service.jdbc.DataSourceFactory? Or is the message about not
> > getting an instance of org.osgi.service.jdbc.DataSourceFactory?
> >
> > The full error message from karaf.log below.
> >
> > Thanks!
> >
> >
> > - Steinar
> >
> > Error message from karaf.log follows:
> >
> > 2017-12-04T20:28:57,555 | ERROR | Karaf local console user karaf |
> ShellUtil                        | 42 - org.apache.karaf.shell.core - 4.1.3
> | Exception caught while executing command
> > org.osgi.service.resolver.ResolutionException: Unable to resolve root:
> missing requirement [root] osgi.identity; osgi.identity=sonar-collector-webhook;
> type=karaf.feature; version="[1.0.0.SNAPSHOT,1.0.0.SNAPSHOT]";
> filter:="(&(osgi.identity=sonar-collector-webhook)(type=
> karaf.feature)(version>=1.0.0.SNAPSHOT)(version<=1.0.0.SNAPSHOT))"
> [caused by: Unable to resolve sonar-collector-webhook/1.0.0.SNAPSHOT:
> missing requirement [sonar-collector-webhook/1.0.0.SNAPSHOT]
> osgi.identity; osgi.identity=no.priv.bang.sonar.sonar-collector-webhook;
> type=osgi.bundle; version="[1.0.0.SNAPSHOT,1.0.0.SNAPSHOT]";
> resolution:=mandatory [caused by: Unable to resolve
> no.priv.bang.sonar.sonar-collector-webhook/1.0.0.SNAPSHOT: missing
> requirement [no.priv.bang.sonar.sonar-collector-webhook/1.0.0.SNAPSHOT]
> osgi.s
> > ervice; effective:=active; filter:="(objectClass=org.osgi.service.jdbc.
> DataSourceFactory)"]]
> >    at org.apache.felix.resolver.ResolutionError.toException(ResolutionError.java:42)
> ~[?:?]
> >    at org.apache.felix.resolver.ResolverImpl.doResolve(ResolverImpl.java:391)
> ~[?:?]
> >    at org.apache.felix.resolver.ResolverImpl.resolve(ResolverImpl.java:377)
> ~[?:?]
> >    at org.apache.felix.resolver.ResolverImpl.resolve(ResolverImpl.java:349)
> ~[?:?]
> >    at org.apache.karaf.features.internal.region.
> SubsystemResolver.resolve(SubsystemResolver.java:218) ~[?:?]
> >    at org.apache.karaf.features.internal.service.Deployer.deploy(Deployer.java:291)
> ~[?:?]
> >    at org.apache.karaf.features.internal.service.FeaturesServiceImpl.
> doProvision(FeaturesServiceImpl.java:1248) ~[?:?]
> >    at org.apache.karaf.features.internal.service.
> FeaturesServiceImpl.lambda$doProvisionInThread$1(FeaturesServiceImpl.java:1147)
> ~[?:?]
> >    at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:?]
> >    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> [?:?]
> >    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> [?:?]
> >    at java.lang.Thread.run(Thread.java:748) [?:?]
> >
> >
> >
>



-- 
-- 
Christian Schneider
http://www.liquid-reality.de

Computer Scientist
http://www.adobe.com

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