Hi,
we run our application in Karaf. It has a pluggable architecture in the
sense that extra bundles get installed that perform certain services. The
services are defined using Blueprint descriptors. For installing the
bundles, we use the features framework of Karaf. More specifically, we
generate a feature repository file, add the feature repository, install the
feature, remove the feature repository, and then delete the generated
feature repository file.
This worked well in Karaf 2.4.0, but if we do this in Karaf 4.0, the first
feature install succeeds, but a subsequent feature install yields the
following exception :
org.osgi.service.resolver.ResolutionException: Unable to resolve root:
missing requirement [root] osgi.identity;
osgi.identity=com.ikanalm.phase.echoparameters; type=karaf.feature;
version="[1.0.0,1.0.0]";
filter:="(&(osgi.identity=com.ikanalm.phase.echoparameters)(type=karaf.feature)(version>=1.0.0)(version<=1.0.0))"
at
org.apache.felix.resolver.ResolutionError.toException(ResolutionError.java:42)[8:org.apache.karaf.features.core:4.0.7]
at
org.apache.felix.resolver.ResolverImpl.resolve(ResolverImpl.java:235)[8:org.apache.karaf.features.core:4.0.7]
at
org.apache.felix.resolver.ResolverImpl.resolve(ResolverImpl.java:158)[8:org.apache.karaf.features.core:4.0.7]
at
org.apache.karaf.features.internal.region.SubsystemResolver.resolve(SubsystemResolver.java:216)[8:org.apache.karaf.features.core:4.0.7]
at
org.apache.karaf.features.internal.service.Deployer.deploy(Deployer.java:263)[8:org.apache.karaf.features.core:4.0.7]
at
org.apache.karaf.features.internal.service.FeaturesServiceImpl.doProvision(FeaturesServiceImpl.java:1176)[8:org.apache.karaf.features.core:4.0.7]
at
org.apache.karaf.features.internal.service.FeaturesServiceImpl$1.call(FeaturesServiceImpl.java:1074)[8:org.apache.karaf.features.core:4.0.7]
at java.util.concurrent.FutureTask.run(FutureTask.java:266)[:1.8.0_60]
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[:1.8.0_60]
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[:1.8.0_60]
at java.lang.Thread.run(Thread.java:745)[:1.8.0_60]
The bundle com.ikanalm.phase.echoparameters, version 1.0.0 is the one that
was installed using the generated feature repository file, which looks like
this :
<features xmlns="http://karaf.apache.org/xmlns/features/v1.2.1";
name="com.ikanalm.phase.echoparameters1.0.0_1481545020697">
<feature name="com.ikanalm.phase.echoparameters" version="1.0.0">
<bundle>file://SOMEPATH/com.ikanalm.phase.echoparameters-1.0.0.jar</bundle>
</feature>
</features>
The feature doesn't show up when I do "feature:list -i", and the feature
repository isn't listed when I do "feature:repo-list". The bundle, however,
is still installed, so our application is able to use it.
Unfortunately, the feature is still listed in the requirements list of the
“root” instance :
karaf@root()> requirement-list
Region | Requirement
---------------------------------------------------------------
root | feature:com.ikanalm.phase.echoparameters/[1.0.0,1.0.0]
When I do a “requirement-remove” on the feature, the feature is uninstalled,
and after that I can again install other features without the exception
popping up, but regrettably, the bundle is also uninstalled, so that doesn't
really help us.
Is there a way to remove a requirement on an instance without uninstalling
the feature or the bundle ? Or is the removal of the feature repository a
bad idea, and are we wrong to use the feature framework merely as a “vessel”
to get our bundles installed ?
Note again that this worked fine in Karaf 2.4.0.
Thanks,
Frank 'S Jegers.
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