IntelliJ does not generate Copy Constructor

Question

I try to automatically generate a copy constructor with IntelliJ, but I can not select this due to the box is grey out. How do I automatically generate a copy constructor by IntelliJ?

My Java Class

public class Parameter {
    public double mA;
    public double mB;
    public double mC;
    public double mD;
    public String mPath;

    public Parameter(double mA, double mB, double mC, double mD, String mPath) {
        super();
        this.mA = mA;
        this.mB = mB;
        this.mC = mC;
        this.mD = mD;
        this.mPath = mPath;
    }

    public Parameter(double mA, double mB, double mC, double mD) {
        this(mA, mB, mC, mD, "");
    }

    public double getA() {
        return mA;
    }
    public double getB() {
        return mB;
    }
    public double getC() {
        return mC;
    }
    public double getD() {
        return mD;
    }
    public String getPath(){
        return mPath;
    }
}

The button is grey out.

Answer 1

What you can do is use "create constructor", select all the fields, then manually "tweak" that into a copy constructor :)

No plugin required anyway, and still mostly usable :)

Answer 2

Generating a copy constructor functionality is not built into IntelliJ IDEA. Perhaps that Generate Copy Constructor action is coming from a plugin?