Your centralized visual learning hub for Spring Framework, JPA ORM, and enterprise architecture. Packed with high-resolution interactive Mermaid diagrams, scenario-based interview questions, and colorful, copy-ready code sandboxes in a stunning Tokyo Night theme.
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Entity lifecycle, persistence.xml, EntityManager, SessionFactory, dirty checking, and complete CRUD operations.
jpa_bootstrapping_complete_crud_interview_guide.htmlDeclarative @Transactional, Propagation behaviors, Isolation levels, rollback rules, and custom Spring Data repositories.
spring-jpa-concepts-theory-diagrams-complete-code-v2.htmlDispatcherServlet request lifecycle, WebApplicationContext hierarchy, form handling, controllers, and interview traps.
spring-mvc-interview-guide.htmlForm taglib (<form:form>), @ModelAttribute, Bean Validation (@Valid & BindingResult), custom validators, and @ControllerAdvice exception handling.
spring-mvc-forms.htmlORM explained with analogies, EntityManagerFactory vs EntityManager, 4 entity states, persist/find/JPQL/dirty-checking/merge/remove, all in plain English with interview Q&A.
unit17-jpa-concepts-layman.htmlACID, @Transactional proxy magic, all 7 propagation modes with analogies, rollback rules traps, isolation levels, Spring Data JPA, custom repositories — all in layman terms.
unit20-transactions-concepts-layman.htmlMVC pattern, DispatcherServlet step-by-step, HandlerMapping, ViewResolver, Root vs Servlet context hierarchy, XML vs Java config — everything explained plainly with interview Q&A.
unit23-spring-mvc-concepts-layman.htmlSpring form taglib, @ModelAttribute binding, @Valid + BindingResult, Bean Validation annotations, custom validators, @ExceptionHandler vs @ControllerAdvice — all in layman terms.
unit24-forms-validation-concepts-layman.html@RestController, all REST annotations, Spring Data JPA integration, Producer-Consumer with RestTemplate, HTTP methods, ResponseEntity, status codes — all in plain English with full code examples.
spring-rest-concepts-layman.htmlTwo complete Spring Boot apps — Producer (REST API + JPA + MySQL) and Consumer (RestTemplate + CommandLineRunner) — with every file explained line-by-line in comments. Full request trace, how-to-run guide, and interview Q&A.
microservices-producer-consumer-demo.htmlELI5 breakdown of JPA concepts, entity lifecycle states, dirty checking, top 10 scenario-based questions with scripts, and rapid-fire cheat sheets.
qwen.html