I am trying to add the Features bundles from Apache Karaf allowing me to load bundles defined in a features.xml file.
After adding the bundles and their dependencies, the log shows the following exception:
12:30:42,567 ERROR [org.apache.aries.blueprint.container.BlueprintContainerImpl] (Blueprint Extender: 2) Unable to start blueprint container for bundle org.apache.karaf.features.management: org.osgi.service.blueprint.container.ComponentDefinitionException: java.lang.NoSuchMethodError: org.osgi.framework.Bundle.adapt(Ljava/lang/Class;)Ljava/lang/Object;
at org.apache.aries.blueprint.container.ReferenceRecipe.internalCreate(ReferenceRecipe.java:98)
at org.apache.aries.blueprint.di.AbstractRecipe.create(AbstractRecipe.java:64)
at org.apache.aries.blueprint.container.BlueprintRepository.createInstances(BlueprintRepository.java:219)
at org.apache.aries.blueprint.container.BlueprintRepository.createAll(BlueprintRepository.java:147)
at org.apache.aries.blueprint.container.BlueprintContainerImpl.instantiateEagerComponents(BlueprintContainerImpl.java:631)
at org.apache.aries.blueprint.container.BlueprintContainerImpl.doRun(BlueprintContainerImpl.java:337)
at org.apache.aries.blueprint.container.BlueprintContainerImpl.run(BlueprintContainerImpl.java:230)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [rt.jar:1.7.0_07]
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) [rt.jar:1.7.0_07]
at java.util.concurrent.FutureTask.run(FutureTask.java:166) [rt.jar:1.7.0_07]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178) [rt.jar:1.7.0_07]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292) [rt.jar:1.7.0_07]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) [rt.jar:1.7.0_07]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) [rt.jar:1.7.0_07]
at java.lang.Thread.run(Thread.java:722) [rt.jar:1.7.0_07]
Caused by: java.lang.NoSuchMethodError: org.osgi.framework.Bundle.adapt(Ljava/lang/Class;)Ljava/lang/Object;
at org.apache.aries.util.internal.R43Worker.getClassLoader(R43Worker.java:40)
at org.apache.aries.util.AriesFrameworkUtil.getClassLoaderForced(AriesFrameworkUtil.java:99)
at org.apache.aries.proxy.impl.AbstractProxyManager.getClassLoader(AbstractProxyManager.java:93)
at org.apache.aries.proxy.impl.AsmProxyManager.createNewProxy(AsmProxyManager.java:84)
at org.apache.aries.proxy.impl.AbstractProxyManager.createProxy(AbstractProxyManager.java:50)
at org.apache.aries.proxy.impl.AbstractProxyManager.createProxy(AbstractProxyManager.java:39)
at org.apache.aries.blueprint.container.AbstractServiceReferenceRecipe.createProxy(AbstractServiceReferenceRecipe.java:236)
at org.apache.aries.blueprint.container.ReferenceRecipe.internalCreate(ReferenceRecipe.java:82)
... 14 more

It looks like there are some incompatibilities between JBoss OSGi and Apache Felix which Karaf is primarily based on.