cfx-http-async feature throws an exceptions when used in Fuse

Issue

• We had a project working fine with JBoss Fuse 6.1. It was using CXF async client and we were using the feature cxf-http-async.
  We upgraded to JBoss Fuse 6.2 and this is not working anymore. When JBoss Fuse starts, we have the following exception:

14 juil. 2015 16:26:26,686 | ERROR | CM Configuration Updater (ManagedService Update: pid=[org.apache.cxf.transport.http.async]) | configadmin | 7 - org.apache.felix.configadmin - 1.8.2 | [org.osgi.service.cm.ManagedService, id=232, bundle=156/mvn:org.apache.cxf/cxf-rt-transports-http-hc/3.0.4.redhat-620133]: Unexpected problem updating configuration org.apache.cxf.transport.http.async
java.lang.NullPointerException
    at org.apache.cxf.transport.http.asyncclient.AsyncHTTPConduitFactory.addListener(AsyncHTTPConduitFactory.java:282)[156:org.apache.cxf.cxf-rt-transports-http-hc:3.0.4.redhat-620133]
    at org.apache.cxf.transport.http.asyncclient.AsyncHTTPConduitFactory.<init>(AsyncHTTPConduitFactory.java:144)[156:org.apache.cxf.cxf-rt-transports-http-hc:3.0.4.redhat-620133]
    at org.apache.cxf.transport.http.asyncclient.Activator$ConduitConfigurer.updated(Activator.java:79)[156:org.apache.cxf.cxf-rt-transports-http-hc:3.0.4.redhat-620133]
    at org.apache.felix.cm.impl.helper.ManagedServiceTracker.updated(ManagedServiceTracker.java:189)[7:org.apache.felix.configadmin:1.8.2]
    at org.apache.felix.cm.impl.helper.ManagedServiceTracker.updateService(ManagedServiceTracker.java:152)[7:org.apache.felix.configadmin:1.8.2]
    at org.apache.felix.cm.impl.helper.ManagedServiceTracker.provideConfiguration(ManagedServiceTracker.java:85)[7:org.apache.felix.configadmin:1.8.2]
    at org.apache.felix.cm.impl.ConfigurationManager$ManagedServiceUpdate.provide(ConfigurationManager.java:1440)[7:org.apache.felix.configadmin:1.8.2]
    at org.apache.felix.cm.impl.ConfigurationManager$ManagedServiceUpdate.run(ConfigurationManager.java:1396)[7:org.apache.felix.configadmin:1.8.2]
    at org.apache.felix.cm.impl.UpdateThread.run(UpdateThread.java:103)[7:org.apache.felix.configadmin:1.8.2]
    at java.lang.Thread.run(Thread.java:745)[:1.8.0_40]

• To reproduce the issue:
  • Start JBoss Fuse using karaf.bat
  • In the karaf console: features:install cxf-http-async
  • Restart JBoss Fuse and you'll see the exception mentioned above.