XmlElement firstChild = configNodes.get(0);
Preconditions.checkState(configNodes.size() == 1, "This element should be present only once " + firstChild
+ " but was " + configNodes.size());
Preconditions.checkNotNull(firstChild, "Element %s should be present", firstChild);
XmlElement firstChild = configNodes.get(0);
Preconditions.checkState(configNodes.size() == 1, "This element should be present only once " + firstChild
+ " but was " + configNodes.size());
Preconditions.checkNotNull(firstChild, "Element %s should be present", firstChild);