Vertex(String label) {
            this.label = label;
        }

        String getLabel() {
            return label;
        }

        List<Vertex> getChildren() {
            return children;
        }

        List<Vertex> getParents() {
            return parents;
        }
    }

        Vertex(String label) {
            this.label = label;
        }

        String getLabel() {
            return label;
        }

        List<Vertex> getChildren() {
            return children;
        }

        List<Vertex> getParents() {
            return parents;
        }
    }

    static class CycleDetectedException extends RuntimeException {

         * descriptor and a corresponding artifact file. The root artifact on the other hand is only used
         * as a label for the root node of the graph in case no root dependency was specified. As such, the configured
         * root artifact is ignored if {@link #root(DependencyCoordinate)} has been set.
         *