Whilst trying to install the Nimble plugin for Grails using Maven I ran in to a spot of bother!
Chill:superted idimmu$ mvn grails:install-plugin -DpluginName=nimble
[INFO] Scanning for projects...
[INFO] Searching repository for plugin with prefix: 'grails'.
[INFO] ------------------------------------------------------------------------
[INFO] Building Unnamed - idimmu.net:superted:war:1.0-SNAPSHOT
[INFO] task-segment: [grails:install-plugin] (aggregator-style)
[INFO] ------------------------------------------------------------------------
[INFO] [grails:install-plugin]
[INFO] Using Grails 1.2.0
Running pre-compiled script
Environment set to development
Reading remote plugin list ...
Reading remote plugin list ...
Latest release information is not available for plugin 'nimble', specify concrete release to install
An investigation in to the available plugins yielded
Chill:superted idimmu$ mvn grails:list-plugins
[INFO] Scanning for projects...
[INFO] Searching repository for plugin with prefix: 'grails'.
nimble <0.3-SNAPSHOT (?)> -- Nimble
So a bit of reading and thinking and specifically talking to another Grails developer, I found the solution
Chill:superted idimmu$ mvn grails:install-plugin -DpluginName=nimble -DpluginVersion=0.3-SNAPSHOT
[INFO] Scanning for projects...
[INFO] Searching repository for plugin with prefix: 'grails'.
[INFO] ------------------------------------------------------------------------
[INFO] Building Unnamed - idimmu.net:superted:war:1.0-SNAPSHOT
[INFO] task-segment: [grails:install-plugin] (aggregator-style)
[INFO] ------------------------------------------------------------------------
[INFO] [grails:install-plugin]
[INFO] Using Grails 1.2.0
Running pre-compiled script
Environment set to development
Reading remote plugin list ...
Reading remote plugin list ...
[get] Getting: https://plugins.grails.org/grails-nimble/tags/RELEASE_0_3-SNAPSHOT/grails-nimble-0.3-SNAPSHOT.zip
[get] To: /Users/idimmu/.grails/1.2.0/plugins/grails-nimble-0.3-SNAPSHOT.zip