@Override
    public String toString() {
        return "ComponentNode{" +
                super.toString() +
                ", clazz=" + clazz +
                ", key=" + key +
                ", configId='" + configId + '\'' +
                '}';
    }
@author Tony Vaagenes
@author gjoranv
@author ollivir
container-core/src/main/java/com/yahoo/container/di/componentgraph/core/ComponentNode.java