Worked examples and code snippets for common software engineering problems.
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Learn Java multithreading through practical examples of threads, executors, virtual-thread request handling, safe shared state, and deadlock prevention.
Build layered Kafka tests: isolate listener behavior, verify producer-to-consumer delivery with embedded Kafka, and test asynchronous processing, retries, and recovery.
Learn to create, query, update, remove, clear, and iterate over a Java HashMap with runnable examples, plus practical guidance on nulls, ordering, sizing, and concurrency.
Share navigation and page structure without duplicating code. Compare Pages Router composition, persistent _app and getLayout patterns, and App Router nested layouts.
Connect MongoDB to a legacy Next.js custom Express server with Mongoose. Reuse connections, fix startup handling, bound posts queries, and understand the built-in API alternative.
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