https://www.vatsalverma.in/blog Vatsal Verma is a software engineer at Amdocs writing about Java, Spring Boot, Elasticsearch, and JVM systems. Portfolio, projects, blog, and contact. en-in vatsalverma999@gmail.com (Vatsal Verma) https://www.vatsalverma.in/blog/spring-boot-ultra-zero-to-architect https://www.vatsalverma.in/blog/spring-boot-ultra-zero-to-architect Sat, 08 Aug 2026 00:00:00 GMT The ultra Spring Boot textbook - Parts I–XXI with deep lessons, matrices, mermaid diagrams, labs, architect chapters (starters, Actuator, security, GraphQL, SSL, JdbcClient, CRaC), plus a 972-topic atlas with official docs links. https://www.vatsalverma.in/blog/elasticsearch-complete-course https://www.vatsalverma.in/blog/elasticsearch-complete-course Thu, 06 Aug 2026 00:00:00 GMT A proper Elasticsearch course - teach Lucene guts, search, analytics, lifecycle, vectors, and ops with worked examples and official elastic.co docs links on every topic. Not a flashcard deck. https://www.vatsalverma.in/blog/java-internals-1000-qa https://www.vatsalverma.in/blog/java-internals-1000-qa Thu, 06 Aug 2026 00:00:00 GMT A thousand Q&As on JVM guts - memory, GC, concurrency, proxies, classloading - and the basics that still break production. Built for revision, not fluff. https://www.vatsalverma.in/blog/introducing-arwenforge https://www.vatsalverma.in/blog/introducing-arwenforge Wed, 22 Jul 2026 00:00:00 GMT One MCP endpoint, many agents. ArwenForge tags tools, resources, prompts, and delegates with profiles — then enforces least-privilege discovery and fail-closed execution on the JVM. https://www.vatsalverma.in/blog/introducing-docube-db https://www.vatsalverma.in/blog/introducing-docube-db Mon, 22 Jun 2026 00:00:00 GMT A small Java library that finds the right invoice, serial, or part code when the input is almost right using a chunk trie to prune and Levenshtein to rank. Open source on GitHub. https://www.vatsalverma.in/blog/dp-basic-to-advanced https://www.vatsalverma.in/blog/dp-basic-to-advanced Fri, 12 Jun 2026 00:00:00 GMT A 7-day roadmap from recursion and memoization through knapsack, tree DP, bitmask DP, and interval DP - with curated LeetCode problems and contest-ready patterns. https://www.vatsalverma.in/blog/langchain-langgraph-blog https://www.vatsalverma.in/blog/langchain-langgraph-blog Thu, 11 Jun 2026 00:00:00 GMT This post takes you from "what is an LLM API?" to production agents - step by step, no prior knowledge assumed. https://www.vatsalverma.in/blog/solid-principles-ultimate-guide https://www.vatsalverma.in/blog/solid-principles-ultimate-guide Sun, 07 Jun 2026 00:00:00 GMT A deep-dive into all five SOLID principles with real-world analogies, bad vs. good code comparisons, and complete Java examples. Learn how to write clean, maintainable, and extensible software that your future self will thank you for. https://www.vatsalverma.in/blog/design-patterns-ultimate-guide https://www.vatsalverma.in/blog/design-patterns-ultimate-guide Sat, 06 Jun 2026 00:00:00 GMT A deep-dive into all 23 GoF design patterns - Creational, Structural, and Behavioral, explained with real-world analogies, UML intent, and complete Java code examples. Your one-stop reference for writing better, scalable software. https://www.vatsalverma.in/blog/embabel-agent-framework https://www.vatsalverma.in/blog/embabel-agent-framework Thu, 21 May 2026 00:00:00 GMT A deep-dive into Embabel - the JVM-native agent framework that replaces brittle workflows with type-driven, goal-oriented AI planning. Learn the core concepts, write your first agent, and understand why it's a step ahead of LangGraph, CrewAI, and similar tools. https://www.vatsalverma.in/blog/interesting-finds https://www.vatsalverma.in/blog/interesting-finds Papers, articles, and anything else worth saving, a living list of things I keep coming back to.