//todo: BaseResourceDefinition.BaseHrefPostProcessor calls static ClusterControllerHelper.getClusterController().
private TreeNode<QueryInfo> createPropertyTree() {
TreeNode<QueryInfo> propertyTree = new TreeNodeImpl<QueryInfo>(null, new QueryInfo(
new ClusterResourceDefinition(), new HashSet<String>()), "Cluster");
Set<String> clusterProperties = propertyTree.getObject().getProperties();
clusterProperties.add("Clusters/cluster_name");
clusterProperties.add("Clusters/version");
clusterProperties.add("Clusters/prop1");
clusterProperties.add("foo");