Karaf feature:install throws Unsupported 'Bundle-ManifestVersion' value: 1 - karaf

Question

I am new to Karaf and trying to learn how to handle it.
On the way I tried to add Camunda features.
Like described on https://github.com/camunda/camunda-bpm-platform-osgi/tree/master/camunda-bpm-karaf-feature
at first, I added the repo:
feature:repo-add mvn:org.camunda.bpm.extension.osgi/camunda-bpm-karaf-feature/4.1.0/xml/features
then I tried to install them;
feature:install camunda-bpm-karaf-feature-full
unfortunately I got this Exception
org.osgi.framework.BundleException: Unable to build resource for mvn:xmlpull/xmlpull/1.1.3.1: Unsupported 'Bundle-ManifestVersion' value: 1
at org.apache.felix.utils.resource.ResourceBuilder.build(ResourceBuilder.java:82)
at org.apache.felix.utils.resource.ResourceBuilder.build(ResourceBuilder.java:67)
at org.apache.karaf.features.internal.region.SubsystemResolver.prepare(SubsystemResolver.java:180)
at org.apache.karaf.features.internal.service.Deployer.deploy(Deployer.java:379)
at org.apache.karaf.features.internal.service.FeaturesServiceImpl.doProvision(FeaturesServiceImpl.java:1025)
at org.apache.karaf.features.internal.service.FeaturesServiceImpl.lambda$doProvisionInThread$13(FeaturesServiceImpl.java:964)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.osgi.framework.BundleException: Unsupported 'Bundle-ManifestVersion' value: 1
at org.apache.felix.utils.resource.ResourceBuilder.doBuild(ResourceBuilder.java:90)
at org.apache.felix.utils.resource.ResourceBuilder.build(ResourceBuilder.java:80)
... 9 more
Error executing command: Unable to build resource for mvn:xmlpull/xmlpull/1.1.3.1: Unsupported 'Bundle-ManifestVersion' value: 1
I am using Karaf version 4.2.1
Does somebody know what I am doing wrong?

Answer 1

One of the features depend on xmlpull 1.1.3.1 which has Manifest-Version: 1.0 in MANIFEST.MF thus making it an OSGi R3 bundle.
Apache Felix supports bundles conforming the OSGi Release 4 (or newer) only (Manifest-Version: 2.0) which is why it rejects xmlpull. See the Felix source for reference.
If you control the source consider wrapping xmlpull and installing the wrapped bundle from the features. You can also play around with the Karaf console; for example, install -s wrap:mvn:xmlpull/xmlpull/1.1.3.1.