My main goal is to use groovy to configure Jenkins and all the plugins, so that I don\'t need to manually configure Jenkins through the web interface, as the the post here w
The CreateJobAdvancedPlugin class seems to have no Descriptor. You need to get the plugin instance from the PluginManager instead, e.g.
import hudson.PluginWrapper
import hudson.plugins.createjobadvanced.CreateJobAdvancedPlugin
import jenkins.model.Jenkins
PluginWrapper wrapper = Jenkins.instance.pluginManager.getPlugin(CreateJobAdvancedPlugin)
CreateJobAdvancedPlugin plugin = wrapper.getPlugin() as CreateJobAdvancedPlugin