Master Java: From Core to Cloud
Curated roadmaps, deep-dive architectures, and production-tested interview questions designed for modern software engineers.
Interview Questions
Frequently tested scenario-based questions with working code solutions and interview tips.
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Top 8 Java 8 Stream Coding Interview Questions for Experienced NEW
Salary filters, Collectors.groupingBy, anagram grouping, and character frequencies with complete code.
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Multithreading & Concurrency Scenario-Based Questions UPDATED
Deadlock detection, thread pool sizing, volatile keyword, and producer-consumer implementations.
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Spring Boot & Microservices Top 30 Technical Questions TRENDING
Bean lifecycles, circuit breakers, distributed tracing, and transactional propagation rules.
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Java 21 Virtual Threads vs Platform Threads Questions YET TO RELEASE
Project Loom internals, carrier threads, pinning issues, and high-throughput concurrency.
Java 8 & Modern Features
Master functional programming, streams, lambdas, and modern syntax up to Java 21.
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Java 8 Streams API Deep Dive: Map, FlatMap & Collectors UPDATED
Comprehensive guide to intermediate and terminal stream operations with performance best practices.
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Lambdas & Built-in Functional Interfaces (Predicate, Function, Consumer) UPDATED
How functional interfaces work under the hood with invokedynamic and method references.
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Java 8 Optional: Best Practices, Pitfalls & Anti-Patterns NEW
Never call .get() blindly. Clean idioms for orElse, orElseGet, and chaining with flatMap.
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Modern Java: Records, Sealed Classes & Pattern Matching YET TO RELEASE
Clean data modeling from Java 14 through Java 21 without Lombok dependencies.
Core Java & Collections
Rock-solid fundamentals: JVM types, OOP paradigms, exception hierarchies, and data structures.
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Java Fundamentals: Types, Memory Model & Syntax Best Practices UPDATED
Primitive vs reference types, string pool mechanics, and immutability design.
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Java Collections Internals: HashMap, ConcurrentHashMap & TreeMap NEW
Hash collision treeification (Red-Black tree conversion), load factors, and thread safety.
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Exception Handling: Checked vs Unchecked & Custom Exception Hierarchies UPDATED
Clean error handling patterns, try-with-resources, and auto-closable connections.
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Java Generics: Wildcards (? extends T), Invariance & Type Erasure YET TO RELEASE
Deep dive into PECS (Producer Extends, Consumer Super) and bytecode signatures.
Concurrency & Multithreading
Thread safety, synchronization, non-blocking algorithms, and asynchronous processing.
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ThreadPoolExecutor Tuning: Core Pool Size, Queue Types & Rejection Policies NEW
How to prevent thread pool exhaustion and memory leaks under extreme server traffic.
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CompletableFuture: Building Non-Blocking Asynchronous Pipelines UPDATED
Combining async tasks with thenCombine, allOf, exceptionally, and custom executors.
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Java Memory Model: Volatile, CAS & Atomic Variables Explained TRENDING
Happens-before relationships, cache coherence, CPU barrier instructions, and lock-free code.
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Distributed Locking in Java using Redis (Redisson) & ZooKeeper YET TO RELEASE
Lease management, watchdog thread renewal, and split-brain tolerance.
Spring Boot & Microservices
Production enterprise patterns: APIs, security, cloud-native deployments, and database access.
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Clean Architecture with Spring Boot 3 & Java 21 NEW
Hexagonal / ports & adapters pattern, domain isolation, and clean repository layering.
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Spring Security 6: Stateless JWT Authentication & RBAC Filters UPDATED
Configuring SecurityFilterChain, custom user details, and refreshing bearer tokens.
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Event-Driven Microservices with Apache Kafka & Spring Cloud Stream YET TO RELEASE
Idempotent consumers, transactional outbox pattern, and Dead Letter Queues (DLQ).
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