apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/entity/model/NamespaceTextModel.java/NamespaceTextModel/isInvalid
class NamespaceTextModel:  @Override
  public boolean isInvalid() {
    return StringUtils.isContainEmpty(appId, env, clusterName, namespaceName) || namespaceId <= 0;
  }