#Spring Boot

Spring vs Spring Boot #spring #springboot #Java #javadeveloper #programmer

🚀 Spring Boot Interview Preparation – Top 30 Questions Preparing for a Java backend interview? These important Spring Boot interview questions will help you revise quickly and boost your confidence. 💻 📌 Topics Covered: ✔ Basics of Spring Framework ✔ Annotations & REST APIs ✔ Dependency Injection ✔ Spring Data JPA ✔ Real-time scenario questions 💡 Save this post for quick revision before your interview! Follow 👉 @coding.bytes1 for daily coding content on Java • SQL • Python • DSA #springboot #javadeveloper #java #coding #backenddeveloper

29 MOST ASKED SPRING BOOT ANNOTATION QUESTIONS (Easy → Medium → Hard) Comment "pdf" for interview precise answers to all these questions. Stop randomly preparing. Focus level-wise 👇 🟢 EASY (Foundation — must be perfect) 1. What is @SpringBootApplication? 2. What are the components of @SpringBootApplication? 3. What is @Component? 4. Difference between @Component, @Service, @Repository? 5. What is @Autowired? 6. What is @RestController? 7. Difference between @Controller and @RestController? 8. What is @RequestMapping? 9. What is @GetMapping / @PostMapping? 10. What is @PathVariable? 🟡 MEDIUM (Real interview level) 11. Constructor vs Field Injection — which is better? 12. What is @Qualifier? 13. What is @Primary? 14. What is @Bean and how is it different from @Component? 15. What is @Configuration? 16. What is @RequestParam vs @RequestBody? 17. What is @ResponseBody? 18. What is @Valid and how does validation work? 19. What is @ExceptionHandler? 20. What is @ControllerAdvice? 🔴 HARD (Where most people fail) 21. What is @Transactional and its propagation types? 22. What is @Entity and how mapping works internally? 23. What is @Table? 24. What is @Id and @GeneratedValue strategies? 25. What are @OneToMany and @ManyToOne mappings? 26. FetchType.LAZY vs EAGER — when to use what? 27. What is @Value vs @ConfigurationProperties? 28. What is @EnableAutoConfiguration? 29. How does Spring Boot Auto Configuration work internally? Comment "pdf" for rest of the interview questions and precise answers to all these questions. Save this 📌 and revise before every interview. #systemdesign #engineers #developers #softwareengineering #springboot [coding, system design, springboot, genAl developers, software engineer, coders, java]

@Primary = Default choice @Qualifier = Exact choice ⚡ #Programming #Java #SpringBoot #CodingTips #LearnProgramming

This is not a coding question. This is a REST semantics + API contract design problem. ⸻ 1️⃣ What most developers think PUT → update full object PATCH → update partial object Simple theory. But internally both may call: save() ⸻ 2️⃣ What actually happens in Spring/JPA Flow: API → Controller → Service → repository.save() Inside Hibernate: → if id exists → entity is updated → dirty checking compares fields → only changed fields may be updated in SQL So technically: PUT and PATCH can behave SAME at DB level ⸻ 3️⃣ Then what is the real difference? It is NOT save() It is API contract: PUT → full object replacement expected → missing fields = overwrite risk PATCH → partial update allowed → only selected fields change Flow: PUT → full state replacement PATCH → partial state modification ⸻ 4️⃣ Why this matters in production PUT misuse: → accidental field overwrite → data loss risk PATCH misuse: → inconsistent partial state if not validated So difference is: ✔ not Hibernate ✔ not save() ✔ but API design rule ⸻ 🔥 Interview Ready One-Liner: PUT and PATCH may use the same save() internally, but the real difference is API contract—PUT expects full object replacement, while PATCH allows partial state updates without overwriting entire data. ⸻ 👉 Follow for more such production-level backend breakdowns HAPPY CODING #backend #java #springboot #api #restapi hibernate jpa microservices softwareengineering techindia codingindia indiandeveloper

Check bio for the ebook or comment scenario to get into your Inbox . . . . . . . . . . . . . . . . . . . . #coding #interviewquestions #backenddeveloper #interviewpreparation #springboot

Profiling concept in #springboot #javaprogramming #javaprogrammer #softwaredevelopment #hungrycoders

Spring Boot / Backend Frameworks = Engine of Backend This is where concepts turn into real applications. In this part, we’re learning the core layers behind backend development: • Controllers • Service Layer • Repository Layer • Dependency Injection • Exception Handling This is where your backend code actually lives. Understand these layers, and Spring Boot architecture starts making sense. Comment “SPRING” and I’ll send you the complete notes in DM 📩 Follow for the Backend Mastery Series 🚀 #backend #springboot #java #backenddeveloper #corporatelife softwareengineering coding developers systemdesign programming

Top 100 SpringBoot Questions #java #springboot #softwareengineering #backenddeveloper #dsa [backend developers, frontend developers , full stack developers, mern stack , Spring Boot , Kafka ]

Interviewer: What is the difference between PUT and PATCH in REST APIs? 👀 Most developers answer: PUT → Full Update PATCH → Partial Update That’s the textbook definition. But production systems work a little differently. 👇 In Spring Boot + JPA, both requests often end up calling the same method: repository.save() Flow: Request → Controller → Service → Hibernate/JPA → Database Inside Hibernate: ✔ Entity is fetched using ID ✔ Dirty checking detects modified fields ✔ Only changed columns may be updated in SQL Which means: At the database level, PUT and PATCH can behave very similarly. So where is the REAL difference? 👀 The difference is not in Hibernate. The difference is in the API CONTRACT. 🟢 PUT Represents full resource replacement. Client is expected to send the complete object state. Missing fields may overwrite existing values. Example Risk: If “phoneNumber” is missing in request, it may become NULL in database. Used when: ✔ Replacing entire resource ✔ Maintaining complete object state 🟡 PATCH Represents partial resource modification. Client sends only fields that need changes. Existing fields remain untouched. Used when: ✔ Updating specific fields ✔ Reducing payload size ✔ Avoiding accidental overwrites ⚠ Production-Level Concerns Incorrect PUT usage: → Accidental data loss → Null overwrites → Unintended state replacement Incorrect PATCH usage: → Invalid partial states → Broken business validation → Inconsistent resource data 💡 Interview-Ready Answer: “PUT and PATCH may internally use the same save() operation in JPA, but the actual difference lies in REST API semantics. PUT expects full resource replacement, whereas PATCH is designed for partial state modification without replacing the entire object.” That’s the difference between: Knowing frameworks ❌ vs Understanding API design semantics ✅ #backend #java #springboot #restapi #api [ hibernate jpa microservices softwareengineering systemdesign backenddevelopment javadeveloper coding developer programming fullstackdeveloper interviewquestions tech softwaredeveloper indiandeveloper]

Git Version Control System - Distributed VCS vs Centralized VCS . . . #softwareengineer #softwaredeveloper #java #systemdesign #springboot

Java Interview Series 50 | Spring Boot Thymeleaf in Spring Boot! A must-know concept for every spring boot interview. 📌 Save this for later 🙌🏻 Share to your Java buddy 👉 Follow @abhishek.codelab for more interview prep #coding #java #interview #springboot #javaprogramming