In the plugin wiki page, it is mentioned that we need Jenkins 1.609 and and the docker-commons plugin 1.0 if we want to use the Docker Custom Build Env plugin.
Two others dependencies are listed as : maven-plugin 2.12 & dockerhub-notification 1.0.
I tried to install your plugin on Jenkins 1.609.3 with docker-commons installed and I get the following error at Jenkins startup :
Note that as I didn't explicitly installed the maven-plugin, Jenkins was using the one embedded in 1.609.3, maven-plugin 2.7.1.
Then I installed the maven-plugin 2.12 and your plugin was working fine: I didn't get any error at Jenkins startup.
So could you please update the wiki page of your plugin to specify that maven-plugin 2.12 is not and optional dependency ?