Cache<String, Integer> cache = Cache2kBuilder .of(String.class, Integer.class) .name("myCache") .eternal(true) .expireAfterWrite(Duration.ofMinutes(10)) .entryCapacity(1000) .permitNullValues(true) .build(); Cache<String, Integer> cache = Cache2kBuilder.of(String.class, Integer.class) .loader(new CacheLoader<String, Integer>() { @Override public Integer load(String key) { return computeSomeValueBasedOnKey(key); } }) .build(); Cache<String, Integer> cache = Cache2kBuilder.of(String.class, Integer.class) .addListener(new CacheEntryListener<String, Integer>() { @Override public void onEntryExpired(Cache<String, Integer> cache, CacheEntry<String, Integer> entry) { System.out.println("Cache entry expired: " + entry.getKey()); } @Override public void onEntryRemoved(Cache<String, Integer> cache, CacheEntry<String, Integer> entry) { System.out.println("Cache entry removed: " + entry.getKey()); } @Override public void onEntryUpdated(Cache<String, Integer> cache, CacheEntry<String, Integer> entry, CacheEntry<String, Integer> newEntry) { System.out.println("Cache entry updated: " + entry.getKey()); } }) .build();