@PreDestroy
public void destroy() {
log.info("Remove Cache Manager metrics");
SortedSet<String> names = metricRegistry.getNames();
names.forEach(metricRegistry::remove);
log.info("Closing Cache Manager");
cacheManager.shutdown();
}
public static void main(String[] args) {
// Sort the names based on their length, placing null first
SortedSet<String> names =
new TreeSet<>(Comparator.nullsFirst(Comparator.comparing(String::length)));
names.add("HTML");
names.add("JAVA");
names.add("SQL");
names.add("CSS");
names.add(null); // Adds a null
names.forEach(System.out::println);
}