maven scala java mixed project

I develop my product with Java and have test code written by Scala(Specs2). I wanted run test cases on my PC and Jenkins.
I have got some problems and solved by the following pom.xml. It works well. I hope this helps you.

Don't forget add "@RunWith(classOf[JUnitRunner])" to your xxxSpec class.

java: invalid flag: -target=1.6 intellij idea

When I ran my test cases, I got this message "error: java: invalid flag: -target=1.6". I search this -"target=1.6" phrase in my project. So I re installed Intellij idea and removed .idea directory and .iml file. But I got same messages.

Finally I solved this problem by removing Additional command line parameters of java compiler.