The goal copy of maven-dependency-plugin does what you want, see the example.
It is however not a good idea to copy anything outside your target directory (or ${project.build.directory}
to be precise) - especially if such action is attached to a build phase, because it introduces unexpected side-effects of the build, and sometimes even loss of reproducibility.
As @Andreas_D notes, there is a better alternative for JBoss deployment purpose; similarly for deploying to other appservers.
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