public String dotString() {
        return createDotString(cycleNodes);
    }
Signals that the dependency graph contains cycles. A DOT language
representation of the cycle is available to help solve the problem (<a
href="http://graphviz.org/">GraphViz</a>).

@author Tony Vaagenes
container-core/src/main/java/com/yahoo/component/chain/dependencies/ordering/CycleDependenciesException.java