https://uddipacharjee.com/blogs/ Notes from building Java and Spring services: what worked, what broke, and why. en https://uddipacharjee.com/blogs/spring-batch-process-million-row-file/ https://uddipacharjee.com/blogs/spring-batch-process-million-row-file/ Load a million-row CSV or fixed-width file into PostgreSQL with Spring Batch 5: chunk-oriented steps, fast batched writes, async launch and safe restarts. Spring Batch Wed, 28 Oct 2026 00:00:00 GMT https://uddipacharjee.com/blogs/spring-modulith-modular-monolith/ https://uddipacharjee.com/blogs/spring-modulith-modular-monolith/ Give a Spring Boot monolith real module boundaries with Spring Modulith: package conventions, verify() tests, named interfaces, events and generated docs. Architecture Wed, 28 Oct 2026 00:00:00 GMT https://uddipacharjee.com/blogs/spring-modulith-transactional-outbox/ https://uddipacharjee.com/blogs/spring-modulith-transactional-outbox/ Use Spring Modulith’s event publication registry as a transactional outbox: @ApplicationModuleListener, JDBC or JPA setup, retries, cleanup and Kafka. Architecture Wed, 28 Oct 2026 00:00:00 GMT https://uddipacharjee.com/blogs/spring-boot-jpa-n-plus-one-open-in-view/ https://uddipacharjee.com/blogs/spring-boot-jpa-n-plus-one-open-in-view/ Find and fix Hibernate N+1 queries in Spring Boot with join fetch, entity graphs, batch fetching and DTOs, and why spring.jpa.open-in-view=false matters. Persistence Wed, 28 Oct 2026 00:00:00 GMT https://uddipacharjee.com/blogs/virtual-threads-spring-boot-java-21/ https://uddipacharjee.com/blogs/virtual-threads-spring-boot-java-21/ Enable virtual threads in Spring Boot on Java 21, understand pinning and connection-pool limits, and measure whether they help your blocking I/O workload. Concurrency Wed, 28 Oct 2026 00:00:00 GMT https://uddipacharjee.com/blogs/spring-boot-problemdetail-validation/ https://uddipacharjee.com/blogs/spring-boot-problemdetail-validation/ Return consistent RFC 9457 error responses from Spring Boot: Bean Validation, ProblemDetail, @RestControllerAdvice, field errors, tests and OpenAPI docs. APIs Wed, 28 Oct 2026 00:00:00 GMT https://uddipacharjee.com/blogs/spring-boot-testing-testcontainers-jacoco/ https://uddipacharjee.com/blogs/spring-boot-testing-testcontainers-jacoco/ A practical Spring Boot testing setup: fast slice tests, real PostgreSQL with Testcontainers and @ServiceConnection, and a JaCoCo coverage gate in Gradle. Testing Wed, 28 Oct 2026 00:00:00 GMT https://uddipacharjee.com/blogs/java-records-vs-lombok/ https://uddipacharjee.com/blogs/java-records-vs-lombok/ Java records vs Lombok’s @Value, @Data and @Builder on Java 21: where records replace Lombok, where they can’t (JPA entities) and how to migrate safely. Java Wed, 28 Oct 2026 00:00:00 GMT https://uddipacharjee.com/blogs/eclipse-dataspace-components-edc-spring-boot/ https://uddipacharjee.com/blogs/eclipse-dataspace-components-edc-spring-boot/ How EDC connectors share data: assets, ODRL policies and contract definitions via the Management API, called from a Spring Boot onboarding service. Data spaces Wed, 28 Oct 2026 00:00:00 GMT https://uddipacharjee.com/blogs/spring-ai-rag-mcp-server/ https://uddipacharjee.com/blogs/spring-ai-rag-mcp-server/ Build retrieval-augmented generation with Spring AI 2, PGVector and a ChatClient advisor, then expose the same search to AI assistants as an MCP tool. AI Wed, 28 Oct 2026 00:00:00 GMT https://uddipacharjee.com/blogs/best-git-gui-clients/ https://uddipacharjee.com/blogs/best-git-gui-clients/ The best and most popular Git GUI clients for Windows, macOS and Linux, compared on price, platforms, licences and features, with advice on choosing. Developer tools Wed, 28 Oct 2026 00:00:00 GMT https://uddipacharjee.com/blogs/which-jdk-distribution/ https://uddipacharjee.com/blogs/which-jdk-distribution/ Temurin, Corretto, Zulu, Liberica, Oracle JDK and more compared for 2026: free update dates, licences, platforms, Docker images and Spring Boot tips. Developer tools Wed, 28 Oct 2026 00:00:00 GMT