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JDK 27 Is Here: What You Get Just by Upgrading (and What Needs --enable-preview)

JDK 27 went GA on 15 September 2026 with 9 JEPs. G1 everywhere, compact object headers, post-quantum TLS and JFR redaction change behaviour with zero code changes; lazy constants, primitive patterns, structured concurrency and the PEM API are previews. What each one means, with working Java examples.

Chaturmind TeamSep 29, 2026

🏗️System Design

Tutorial

System Design

How to Design a System for 1 Million Requests per Second

A step-by-step system design for 1M requests/sec — capacity math with Little's Law, edge caching, load balancing, multi-level caching, consistent-hash sharding, async queues, rate limiting, circuit breakers and autoscaling, with Java examples and the mistakes most designs make.

Chaturmind TeamSep 29, 2026

🗄️Database

TutorialDatabase

Database Indexing Explained: B-Trees, Composite Indexes and When Indexes Hurt

How B-tree indexes make queries fast, why column order matters in composite indexes, covering indexes, reading EXPLAIN, and the cases where adding an index makes things worse.

Chaturmind TeamSep 26, 2026

📊DSA

TutorialDSA

The Sliding Window Pattern: One Template, Many Problems

Turn O(n²) substring and subarray problems into O(n). The fixed and variable sliding window templates in Java, with six worked interview problems.

Chaturmind TeamSep 26, 2026

🏗️System Design

TutorialSystem Design

Kafka for Backend Engineers: Partitions, Ordering and Delivery Guarantees

How Kafka topics, partitions and consumer groups actually work, why ordering is only per partition, and what at-least-once and exactly-once really mean for your Spring Boot services.

Chaturmind TeamSep 26, 2026

🏗️System Design

TutorialSystem Design

Designing a Rate Limiter: Token Bucket, Sliding Window and Redis

The algorithms behind API rate limiting, their trade-offs, and how to build a distributed limiter with an atomic Redis Lua script — a classic system design interview question, solved end to end.

Chaturmind TeamSep 26, 2026

🌱Spring Boot

TutorialSpring Boot

Resilient Microservices: Timeouts, Retries and Circuit Breakers Done Right

One slow dependency can take down a whole system. How timeouts, retries with backoff, circuit breakers and bulkheads work together — with Resilience4j examples for Spring Boot.

Chaturmind TeamSep 26, 2026

🌱Spring Boot

TutorialSpring Boot

@Transactional Pitfalls: 7 Ways Your Spring Transaction Silently Doesn't Work

Self-invocation, checked exceptions, private methods, swallowed exceptions and more — the common reasons @Transactional does nothing or doesn't roll back, and how to fix each one.

Chaturmind TeamSep 26, 2026

☕Java

TutorialJava

Java Garbage Collection Explained: G1, ZGC and How to Choose

How the JVM finds garbage, why generations matter, what G1 and ZGC actually do, and a practical way to pick and tune a collector for your service.

Chaturmind TeamSep 26, 2026

☕Java

TutorialJava

Virtual Threads in Java 21: When They Help and When They Don't

Virtual threads make blocking code scale to hundreds of thousands of concurrent tasks — but only for I/O-bound work. How they work, how to use them in Spring Boot, and the pitfalls.

Chaturmind TeamSep 26, 2026

☕Java

TutorialJava

HashMap Internals: How put() and get() Really Work

Buckets, hash spreading, collisions, treeification and resizing — a step-by-step look inside java.util.HashMap, and why equals() and hashCode() must agree.

Chaturmind TeamSep 26, 2026

☕Java

TutorialJava

10 Java Output Questions That Trip Up Experienced Developers

Integer caching, the String pool, finally blocks that override returns — ten short Java snippets where intuition gives the wrong answer, with the exact reason for each.

Chaturmind TeamSep 26, 2026

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