This is a user forum for the JBoss Fuse product. Are you using that?
If not, and you are using vanilla Apache Karaf then you can try their user mailing list.
And btw I can see there is groovy-all for all groovy versions, eg also for 2.2.x etc
And for the JBoss FUSE 6.1 we do ship groovy-all (2.1.9) OOTB which has the groovy/json/JsonSlurper.class
BossFuse:karaf@root> find-class JsonSlurper
Groovy Runtime (227)
karaf@root()> find-class JsonSlurper
Apache ServiceMix :: Bundles :: json-lib (138)
Groovy Runtime (158)
The class is there but the script complains that it cannot find it.
The bundle should find the class since I used
in the maven-bundle-plugin
Could you please post the OSGi headers for your customer bundle which use the groovy/json/JsonSlurper.class, I'd like to see the Import-Package there.