Welcome to Spring Java Lab 🌱
Learn Java, Spring Boot, and Spring Batch through practical guides, production-style examples, and interview-focused tutorials. Everything here is written so you can copy, run, and understand.
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☕ Java Tutorials
Core Java, collections, streams, Java 21 features, and real-world coding patterns with examples.
🚀 Spring Boot
Build REST APIs, handle JSON, integrate with MySQL / Oracle, and add global exception handling.
📦 Spring Batch
Chunk processing, CSV import/export, skip & retry logic, parallel steps, and job listeners.
💼 Java Interview Q&A
Hand-picked interview questions on collections, concurrency, Java 8–21, and real coding rounds.
🧪 Java Programs
Classic Java programs: arrays, strings, patterns, numbers, and logic building for beginners.
Latest Tutorials
New articles are added regularly. Start with any of these fresh posts and follow the internal links to go deeper.
⚡ Spring Batch Multithreaded Step
Speed up batch jobs using multi-threaded steps and parallel chunk processing in Spring Batch.
🔁 Spring Batch Retry Mechanism
Implement fault tolerance with retry policies, backoff, and recovery callbacks for robust jobs.
📥 Spring Batch CSV to DB
Full CSV-to-database import using Spring Batch with validation, skip policy, and performance tips.
📂 Spring Boot File Upload + DB
Build a REST API to upload and download files, storing them as BLOBs in MySQL / Oracle databases.
🔀 Conditional Flow in Spring Batch
Use transitions, exit statuses, and deciders to build dynamic, conditional job flows.
🧠 Java 21 Interview Questions
Advanced questions on records, pattern matching, virtual threads, and modern Java design.
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