Feature for 'servicemix-http' is incomplete

When I place only "servicemix-http" feature into "featuresBoot":

featuresBoot=servicemix-http

in etc/org.apache.felix.karaf.features.cfg file, it won't start.

Here is error got from log file:

org.osgi.framework.BundleException: The bundle could not be resolved. Reason: Missing Constraint: Import-Package: javax.servlet; version="[2.5.0,3.0.0)"
at org.eclipse.osgi.framework.internal.core.AbstractBundle.getResolverError(AbstractBundle.java:1313)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.getResolutionFailureException(AbstractBundle.java:1297)
at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:309)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:280)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:272)
at org.apache.felix.karaf.features.internal.FeaturesServiceImpl.installFeatures(FeaturesServiceImpl.java:295)
at org.apache.felix.karaf.features.internal.FeaturesServiceImpl$1.run(FeaturesServiceImpl.java:663)