I am using German umlauts like Ã, Ã and Ã in my POM when configuring the outputDirectory and destFileName properties of the copy goal.
When the plugin does the actual copy, the directory and file do not contain that umlauts, but instead a strange symbol (encoding garbage).
It seems the plugin is unable to deal with German umlauts. While Java definitively IS able to correctly handle it, and while the POM is encoded in UTF-8, it is definitively a bug of a Maven component. As I do not know which component fails here, I am reporting it at the failing plugin, as it is the entry-point for me.