Mona Pandey

Software Engineer | Embracing Growth and Learning | On a Fitness Journey

[Mona Pandey @mona_pratibha]

@UPPCLLKO There is no electricity since 3 hours in Unity City Kalyanpur Area. Could you please let us know when we will get the electricity so that we can sleep peacefully.
#uppcl @CMOfficeUP

[Mona Pandey @mona_pratibha]

Coffee at 1 hits different ✌️

[Avinash Singh @AvinashSingh_20]

240 CORE JAVA INTERVIEW QUESTIONS AND ANSWERS 👇

If you are preparing for a Java interview, this PDF with 240 core Java interview questions and answers will help you! Covering topics like static blocks, method overriding, encapsulation, and more, it’s a valuable resource to boost your confidence and skills.

To get the link 👇

1- Follow (so I can DM you)
2- Like & Repost to help others
3- Reply Interview for the pdf

Note: I’ll list this resources in a thread later 👇

#java #interview

[Mona Pandey @mona_pratibha]

#sharadpurnima2025 Kheer 😋

[Mona Pandey @mona_pratibha]

Back to Monday after a long Weekend sucks🥲

[Mona Pandey @mona_pratibha]

Kedarnath is always on the Bucket List. Manifesting it to get it checked as soon as Possible 🤞

[Striver | Building takeUforward @striver_79]

Jai Shri Kedar 🙏

Every step of the 22 km trek was tough, but was worth it.

[Mona Pandey @mona_pratibha]

Starting with next best in Hindi
#DeewarMeinEkKhidakiRehtiThi

[Mona Pandey @mona_pratibha]

Finished a Good Read👌
#octoberJunction

[Mona Pandey @mona_pratibha]

Saturday Read
#ShivaTrilogy

[Mona Pandey @mona_pratibha]

Absolute Cinema 🔥 #DexterResurrection Best one till now.... Mind-blowing 😱

[SumitM @SumitM_X]

Very commonly asked Springboot Interview question for beginners :

What is bootstrapping in Spring Boot?
Explain its importance

[Ashutosh Maheshwari @asmah2107]

Your public API is a hit. Hundreds of developers are building apps on top of it.

Six months later, you realize you need to change a field name in your response.

A breaking change. If you just deploy it, you'll break every single app that depends on your API.

What do you do? 🧵

[Skilled Coder @theskilledcoder]

Different Ways to Handle Configs in Your App

1.Environment Variables
- DB_URL=...
✅ Great for secrets and Docker/K8s
❌ Can get messy at scale

2.Config Files
- application.yml, .env, config.json
✅ Organized, version-controlled
❌ Don’t commit secrets

3.Spring Profiles / Environments
- application-dev.yml, application-prod.yml
✅ Auto-switch based on profile
❌ Easy to forget switching

4.Feature Flags
- Toggle behavior via flags (e.g., LaunchDarkly)
✅ Enable/disable features without redeploy
❌ Adds logic complexity

5.Centralized Config Server
- Spring Cloud Config, Consul, etc.
✅ Dynamic config updates across services
❌ Requires setup + extra infra

[SumitM @SumitM_X]

Top 6 Java multithreading interview Questions:

1. Producer-Consumer – Use BlockingQueue or wait/notify.
2. Print 1–100 (2 Threads) – Alternate using shared counter + lock
3. Print “ABCABC...” – Sync 3 threads with Lock or notifyAll.
4. Custom Thread Pool – Build using worker threads + queue.
5. Deadlock Scenario – Simulate & prevent via lock ordering.
6. Rate Limiter – Implement Token/Leaky Bucket logic.

[SumitM @SumitM_X]

Spring annotations you MUST KNOW before going for a Java interview -

- @ Qualifier
- @ Async
- @ RestController vs @ Controller
- @ Condtional
- @ transactional

[SumitM @SumitM_X]

Very common Java Interview Question (Thread Alternation)

Ques: How do you make two threads print like this: 1 A 2 B 3 C...?"
(Thread 1 prints numbers, Thread 2 prints letters)

Most candidates mess this up by using sleep() or incorrect locking.

But What Interviewers like to hear 👇

“Used a shared monitor object and condition variable”
“Handled spurious wakeups with while loop”
“Used wait/notify for proper thread communication”
“Could also use ReentrantLock + Condition for more control”

Can you write down the correct code?

[SumitM @SumitM_X]

Another Common Springboot Interview :

Q: How do you implement graceful shutdown in Spring Boot?

Ans : Spring Boot (from v2.3+) supports graceful shutdown using the config:

server.shutdown=graceful
spring.lifecycle.timeout-per-shutdown-phase=30s

This ensures Spring waits for active requests to complete before shutting down the app.

To clean up resources (Kafka consumers, DB connections, thread pools), use:

@ PreDestroy on beans
Implement DisposableBean or SmartLifecycle
Override close() for custom beans

You can say something like this to sound experienced:
"We observed that without proper shutdown, some Kafka offsets weren't committed, leading to duplicate processing. After enabling graceful shutdown and handling bean lifecycle correctly, the issue was resolved."

[SumitM @SumitM_X]

Very very common interview question:

How do you implement circuit breaking in Spring Boot?

Start your answer with:
Used Resilience4j with Spring Boot , also mention annotations like @ CircuitBreaker, @ Retry, @ RateLimiter, and @ Bulkhead
Configure thresholds in application.yml.

Can also add this: “We used @ CircuitBreaker with fallback methods on external API calls. Integrated with Prometheus to monitor open/closed state.”
Also Mention fallback cache or async retry mechanism

[Mona Pandey @mona_pratibha]

Gym after Long time 😀
#FitnessInspiration

[SumitM @SumitM_X]

Read “How to Answer Java Spring Boot Interview Questions Like a Pro“ by SumitM on Medium:

https://t.co/vE9CPnWzHK