I chose to create a subclass of java.io.FileOutputStream via the new Scala class wizard, and ticked the box to have constructors from the superclass included. I got this as the body of my class:

    def this(name: String) { this(name, null) }

    def this(file: File) { this(file, null) }

    def this() { this(null) }

    def this() { this(null) }

    def this() { this(null) }

There are three compilation error markers for these lines, so there are several bugs here.