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#Springboot Reel by @coding.bytes1 - 🚀 Spring Boot Interview Preparation - Top 30 Questions

Preparing for a Java backend interview?

These important Spring Boot interview questions will
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@coding.bytes1
🚀 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
#Springboot Reel by @coding_with_deepa - 29 MOST ASKED SPRING BOOT ANNOTATION QUESTIONS 
(Easy → Medium → Hard) 

Comment "pdf" for interview precise answers to all these questions.

Stop ran
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@coding_with_deepa
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]
#Springboot Reel by @codingwithaman (verified account) - Profiling concept in #springboot #javaprogramming #javaprogrammer #softwaredevelopment #hungrycoders
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@codingwithaman
Profiling concept in #springboot #javaprogramming #javaprogrammer #softwaredevelopment #hungrycoders
#Springboot Reel by @codedsoul_05 - Interview Question:

Your REST API works perfectly on localhost.
In production, it returns 403 Forbidden.

What did you miss?
How would you debug it?
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@codedsoul_05
Interview Question: Your REST API works perfectly on localhost. In production, it returns 403 Forbidden. What did you miss? How would you debug it? This is not a coding issue. This is a security + infrastructure issue. In production, small misconfigurations break everything. Here’s how you debug it like a senior engineer: ⸻ 1️⃣ Verify Authentication First 403 means the server understood the request but refused to authorize it. Check: • Is the JWT reaching the backend? • Is the token expired? • Is the role missing in production DB? • Is SecurityContext populated? If authentication fails silently → 403. ⸻ 2️⃣ Check Reverse Proxy / Gateway Many production setups use: • NGINX • HAProxy • AWS API Gateway If the Authorization header is not forwarded, your backend never sees the token. One missing proxy header = complete system failure. ⸻ 3️⃣ CORS Configuration Works on localhost. Fails on production domain. Check: • Is the frontend domain whitelisted? • Are credentials allowed? • Is the OPTIONS request blocked? CORS misconfiguration is a classic production trap. ⸻ 4️⃣ Environment Profile Mismatch Dev profile ≠ Prod profile. Check: • Is CSRF enabled in production? • Are request matchers different? • Role mismatch? (ROLE_USER vs USER) • Missing environment variables? Production configuration mistakes cause silent 403s. ⸻ 5️⃣ Infrastructure Restrictions Sometimes the app is correct. Infrastructure blocks you. Check: • Firewall rules • IP whitelisting • WAF policies • SSL termination issues Not all 403 errors come from your code. ⸻ 🔥 Interview-Ready One-Liner: If an API works locally but fails with 403 in production, I compare security configuration, headers, and infrastructure layers before touching business logic. That’s senior-level debugging. ⸻ Save this for backend interviews. Follow @codedsoul_05 ❤️ #backend #systemdesign #java #springboot #microservices security production indiadevelopers indiatech softwareengineer techindia interviewquestions
#Springboot Reel by @sunchitdudeja - Day 52/50 | Netflix's Chaos Kong | AWS catastrophic crash | System Design Interview Preparation Series 

Learn the Architect's way of handling complet
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@sunchitdudeja
Day 52/50 | Netflix’s Chaos Kong | AWS catastrophic crash | System Design Interview Preparation Series Learn the Architect’s way of handling complete AWS regional crash. - Handle Disaster Recovery - Handle Database Recovery - Handle Gateway Rerouting - Handle CDN Routing - Learn Load Balancing Comment “Chaos” for the complete blog. Follow @sunchitdudeja for more such content. #systemdesign #microservices #java #springboot #architect
#Springboot Reel by @dhruvtechbytes (verified account) - 🚀 230+ Java Backend Interview Questions

Want a complete, topic-wise checklist for cracking Backend interviews?

Comment "pdf" and I'll send you the
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DH
@dhruvtechbytes
🚀 230+ Java Backend Interview Questions Want a complete, topic-wise checklist for cracking Backend interviews? Comment “pdf” and I’ll send you the Java BE Master guide directly in your DM. Covers everything that actually gets asked: • JVM • Java 8 • Collections • Concurrency • Spring Boot • JPA • Databases • Microservices If you're serious about Backend roles, this is your structured roadmap ✅ No random theory. No unnecessary fluff. Just real interview-focused questions. Drop “pdf” below and I’ll share it with you. #java #springboot #microservices #engineers #tech [springboot, java developers, software engineers, tech, microservices, databases, cloud]
#Springboot Reel by @codewith_sushant - 🚀 Top 12 Microservices Patterns Every Developer Must Know

Building scalable systems isn't just about code - it's about choosing the right architectu
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@codewith_sushant
🚀 Top 12 Microservices Patterns Every Developer Must Know Building scalable systems isn’t just about code — it’s about choosing the right architecture. From handling failures to managing distributed transactions, these patterns help you design robust, scalable, and production-ready systems 💡 🔑 What you’ll learn from this: • How API Gateway simplifies client communication • Why Saga is critical for distributed transactions • How Circuit Breaker prevents system failure • When to use CQRS & Event Sourcing • Best practices like Database per Service & Sidecar. 💼 If you're preparing for System Design Interviews or working on Spring Boot Microservices, this is a must-know cheat sheet. 📌 Save this post for quick revision #Microservices #SystemDesign #JavaDeveloper #SpringBoot #BackendDevelopment SoftwareArchitecture TechLearning CodingJourney DeveloperTips InterviewPreparation
#Springboot Reel by @rayofani_ - Spring Boot / Backend Frameworks = Engine of Backend
This is where concepts turn into real applications.
In this part, we're learning the core layers
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@rayofani_
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
#Springboot Reel by @codingshuttle - Evergreen ☘️
Best Java development course, link in bio 🔗 

 #java #springboot #backend #faang #codingshuttle
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@codingshuttle
Evergreen ☘️ Best Java development course, link in bio 🔗 #java #springboot #backend #faang #codingshuttle
#Springboot Reel by @alga.works (verified account) - Essas empresas fazem tudo ao seu alcance para atrair os melhores profissionais do mercado.

Afinal, o dev Spring é o motor da máquina delas... Motor f
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AL
@alga.works
Essas empresas fazem tudo ao seu alcance para atrair os melhores profissionais do mercado. Afinal, o dev Spring é o motor da máquina delas... Motor fraco, empresa fraca... Motor potente, empresa forte. Gostaria que elas desejassem contratar você? Então se torne um especialista. #spring #springframework #springdatajpa #springdata #springmvc #springboot #programação #algaworks #mergulhador
#Springboot Reel by @devllabs (verified account) - Comment "SOAP" and I'll send you detailed notes 📩

#api 
#webservices
#apidevelopment
#backenddevelopment
#springboot
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@devllabs
Comment “SOAP” and I’ll send you detailed notes 📩 #api #webservices #apidevelopment #backenddevelopment #springboot
#Springboot Reel by @abhishek.codelab - Java Interview Series 43 | Spring Boot 

Crud Repository vs JPA Repository!
A must-know concept for every spring boot interview.

📌 Save this for lat
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@abhishek.codelab
Java Interview Series 43 | Spring Boot Crud Repository vs JPA Repository! 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

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