Accepted answer

I am not that sure how it works, but plugins that define the same settings can override each other. If you want to override the settings of AutoPlugin 'X' you will have to add 'X' to the dependencies of your AutoPlugin by overriding requires:

override def requires = X

The AutoPlugin with the most basic settings is the JvmPlugin. Adding this to requires helped me in a similar situation where I tried to add additional artifacts to my library via AutoPlugin. So it might help you, too.

override def requires = JvmPlugin

Otherwise, you might want to look which other plugins enabled in your build modify mappings in (Compile, packageBin).

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