Caching with Cache2K
summary
Cache2K is a tiny high-performance JVM in-memory cache that is already used in production and integrates with Kotlin and Spring Boot. Examples show a standalone cache with refresh-ahead expiry, capacity limits (e.g. 100 entries), and a loader callback that handles miss-and-populate logic; Spring integration uses a Cache2k SpringCacheManager and method-proxying so cache annotations work. A common gotcha requires a self-injection workaround to let internal method calls hit the proxy. Full samples live on GitHub.
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