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From "Christian Schneider (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KARAF-3520) FeatureService fails to install feature in case of missing capability
Date Fri, 05 Jun 2015 14:00:09 GMT

    [ https://issues.apache.org/jira/browse/KARAF-3520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14574522#comment-14574522
] 

Christian Schneider commented on KARAF-3520:
--------------------------------------------

I asked about the problem on OSGi dev. This is what Neil Bartlett answered:
Hi Christian,

As you noticed, bnd generates these requirements with effective:=active. This has no particular
meaning in the OSGi specification. The spec only states that any value of effective other
than “resolve” is ignored by the OSGi Framework*. Therefore these requirements should
never prevent the bundle being resolved in an OSGi Framework.

So it’s entirely up to your resolver implementation how you want to deal with these requirements.

In Bndtools we usually do look for providers matching the effective:=active requirements,
with the exception of requirements in the osgi.service namespace. For example we will resolve
a requirement for the Blueprint extender ("osgi.extender=osgi.blueprint”) but we will ignore
the service requirements. This is because services can be provided remotely via RSA, and we
don’t want to constraint all of the service providers to appear in a single Framework.

Regards,
Neil.

> FeatureService fails to install feature in case of missing capability
> ---------------------------------------------------------------------
>
>                 Key: KARAF-3520
>                 URL: https://issues.apache.org/jira/browse/KARAF-3520
>             Project: Karaf
>          Issue Type: Bug
>          Components: karaf-feature
>    Affects Versions: 4.0.0.M1
>            Reporter: Achim Nierbeck
>            Priority: Critical
>             Fix For: 4.0.0
>
>
> If a bundle does contain a require-capability header for example like the following:

> {code}
> osgi.service; effective:=active; filter:="(objectClass=org.ops4j.pax.url.mvn.MavenResolver)"]]
> {code}
> but there is no bundle satisfying this capability the installation of this feature fails:

> {code}
> org.osgi.service.resolver.ResolutionException: Unable to resolve root: missing requirement
[root] osgi.identity; osgi.identity=mybundle; type=karaf.feature; version="[1.0.0.SNAPSHOT,1.0.0.SNAPSHOT]";
filter:="(&(osgi.identity=mybundle)(type=karaf.feature)(version>=1.0.0.SNAPSHOT)(version<=1.0.0.SNAPSHOT))"
[caused by: Unable to resolve mybundle/1.0.0.SNAPSHOT: missing requirement [mybundle/1.0.0.SNAPSHOT]
osgi.identity; osgi.identity=com.my.package; type=osgi.bundle; version="[1.0.0.SNAPSHOT,1.0.0.SNAPSHOT]";
resolution:=mandatory [caused by: Unable to resolve com.my.package/1.0.0.SNAPSHOT: missing
requirement [com.my.package/1.0.0.SNAPSHOT] osgi.service; effective:=active; filter:="(objectClass=org.ops4j.pax.url.mvn.MavenResolver)"]]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:285)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.processCandidates(Candidates.java:454)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:266)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.Candidates.populate(Candidates.java:153)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.felix.resolver.ResolverImpl.resolve(ResolverImpl.java:148)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.karaf.features.internal.region.SubsystemResolver.resolve(SubsystemResolver.java:186)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.karaf.features.internal.service.Deployer.deploy(Deployer.java:254)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.karaf.features.internal.service.FeaturesServiceImpl.doProvision(FeaturesServiceImpl.java:1028)[6:org.apache.karaf.features.core:4.0.0.M2]
> at org.apache.karaf.features.internal.service.FeaturesServiceImpl$1.call(FeaturesServiceImpl.java:929)[6:org.apache.karaf.features.core:4.0.0.M2]
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)[:1.8.0_25]
> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[:1.8.0_25]
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[:1.8.0_25]
> at java.lang.Thread.run(Thread.java:745)[:1.8.0_25]
> {code}
> The installation of the bundle works from the shell via a bundle:install without issues,
the resolving of the bundle also works. 
> The feature service should handle missing capabilities more graceful. 



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