error msg:

org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed, Derived.groovy: 5: the name vs doesn't refer to a declared variab
le or class. The static scope requires to declare variables before using them. If the variable should have been a class check the spelling.
@ line 5, column 9.
super(vs.size)
^

1 error

The Derived class should be

class Derived extends Base {
	int[] vs

	public Derived(vs) {
		super(vs.length) // correct  vs.size as vs.length
		this.vs = vs
	}

	public static void main(String[] args) {
		int[] vs = new int[5]
		println vs.length
		Base b = new Derived(vs);
		println b.vs
	}
}

org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed, Derived.groovy: 5: the name vs doesn't refer to a declared variab
le or class. The static scope requires to declare variables before using them. If the variable should have been a class check the spelling.
@ line 5, column 9.
super(vs.length)
^

1 error

fixed