Was caching technology used in your last project to optimize system performance?

Yes, in my last Java project, caching technology was used to improve performance. We implemented caching at multiple levels:

• In-memory caching using the Ehcache library for storing frequently requested data.
• Caching query results to the database to reduce load.
• HTTP caching for static resources.

Example of using Ehcache:

CacheManager cacheManager = CacheManagerBuilder.newCacheManagerBuilder()
    .withCache("preConfigured",
        CacheConfigurationBuilder.newCacheConfigurationBuilder(Long.class, String.class,
            ResourcePoolsBuilder.heap(100)))
    .build(true);

Cache<Long, String> preConfigured = cacheManager.getCache("preConfigured", Long.class, String.class);
preConfigured.put(1L, "Cached data");
String value = preConfigured.get(1L);

Caching significantly reduced response time and database load.