Installing a Plug-in Manually
It is also possible to install a plug-in manually. Simply download the plug-in JAR and drop it in your MAVEN_HOME/plugins directory (or in your ~user/.maven/plugins directory if you wish it to be independent of your Maven installation).
Make sure to remove any previously installed version of the same plug-in, as otherwise you won't be sure which version Maven will use. If you have problems executing the new plug-in, remove the ~user/.maven/cache Maven cache directory. It'll be re-created the next time you run Maven.
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