A Tour of the Modern Java Platform
summary
Java 17 records and sealed types enforce immutability and exhaustive pattern matching, and improved NPE messages pinpoint the null field. A Kotlin Spring Boot app uses R2DBC with suspend functions and flows for end-to-end non‑blocking I/O, and tests spin up Postgres via Testcontainers inside Gradle. Buildpacks produce layered images; ahead‑of‑time GraalVM Native Image cuts memory from ~200MB to ~30MB and startup from seconds to single‑digit milliseconds while the native container shrinks to ~20–30MB.
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