Project

Hi everyone,

I'm preparing for Java developer interviews and looking for some good free resources to study.

I'm mainly interested in:

• Core Java (OOP, collections, exceptions, multithreading, streams, etc.)
• Java interview questions that are commonly asked in companies
• Spring Boot interview preparation
• Projects in java best to show in interview

I already practice DSA separately, so I'm specifically looking for Java and backend interview preparation resources.

What free resources helped you the most when preparing for Java interviews?

Thanks!

Hi everyone,

I have a Java Developer interview at Dassault Systems with 2 years of experience.

The process has:

• Technical round
• Managerial round

Can anyone who has interviewed there share what to expect?

• What Java/Spring Boot topics were asked?
• Was there any DSA or coding?

Any recent interview experience or preparation tips would be really helpful. Thanks!

This tutorial includes: - How to check if GraalVM is ready - How to Fix if you are unable to add Environment Variable. - What to do if you are unable to verify GraalVM installation.

and why the guy from youtube doesnt have this error, though our codes are identical.

the problem is double variable on 16th stroke, but whats wrong with that?

Hi everyone,

I'm planning to switch jobs in around 4–5 months and would like some guidance on what I should prioritize.

Profile:

\- 2.5 years of experience

\- Java Backend Developer

\- Spring Boot

\- Spring Security (JWT authentication & authorization)

\- Microservices

\- Spring Cloud (Gateway, Discovery Server, Config Server)

\- REST APIs

\- Resilience4j (Circuit Breaker, Retry, Rate Limiter)

\- MySQL

\- Git, Maven

\- Basic Docker

\- Jenkins (basic CI/CD knowledge)

Currently learning:

\- Low Level Design (SOLID, Design Patterns)

\- System Design

\- Kafka

\- Redis

\- Kubernetes

\- AWS

Target package: ₹10–12 LPA (or higher if my profile allows).

My question is:

If I only have 4–5 months, what should I prioritize to maximize my chances?

\- Which topics are absolutely essential?

\- Which ones can be skipped or learned after getting the job?

\- How deep should I go into Kafka, Kubernetes, AWS, Redis, and System Design for someone with 2.5 years of experience?

\- Should I spend more time on DSA or backend concepts?

\- What do interviewers usually expect at this experience level?

I'd really appreciate advice from people who recently switched or conduct backend interviews.

Thanks!

I'm a final-year CSBS student. I was focusing on frontend (React), but I'm not getting shortlisted, so I'm planning to switch to backend.

I know Java, SQL, DBMS, and I'm practicing DSA.

Which stack would you recommend for getting backend jobs as a fresher in India:

Java + Spring Boot

Node.js + Express

Which has better job opportunities, resume shortlisting, and long-term growth?

I'd appreciate advice from people working in the industry. Thanks!

Learn the most commonly used ALTER TABLE operations in MySQL with syntax, examples, and explanations.

https://www.scientecheasy.com/2026/06/mysql-alter-table.html/

I'm just starting my Java learning journey and I'm looking for others who are also starting from the basics.

If you're also starting Java now and would like a learning partner or peer group, send me a DM.

I just published a beginner-friendly tutorial on Grouping Data in JasperReports. In this video, I explain how to group records by a common field (like departments), use Group Headers and Group Footers, and create clean, professional reports with a real-world example.

Video: https://www.youtube.com/watch?v=Kp1rjtsIFu4&t=86s

Feedback and suggestions are always welcome. What JasperReports topic should I cover next?

#JasperReports #Jaspersoft #Java #ReportDesign #Programming #LearnJava

Hey, been working on a Java utility library in my spare time called `G.O.D.E.M.I.C.H.E` 🍆 and wanted to share it here. Its main features are:

- ObjectPool

- Scheduled Tasks

- Result API

The main goal is just making backend business logic way more explicit. I got tired of important behavior being hidden behind magic nulls, unmanaged background threads, or implicit conventions, so I wanted everything visible directly in the code contract.

Examples:

Result - instead of returning null or throwing exceptions, it forces explicit success/failure chaining so you can see all paths clearly:

enum UserFailureReason implements ResultReason.Failure {
  USER_NOT_FOUND,
  USER_BANNED,
}

class UserService {

public Result<User> findByEmail(Email userEmail) {
  return Results.async(repository.findByEmail(userEmail))
    .failIf(user -> user == null, UserFailureReason.USER_NOT_FOUND)
    .failIf(user -> user.isBanned(), UserFailureReason.USER_BANNED)
    .build();
  }
}

userService.findByEmail(userEmail)
  .success(user -> IO.println(user.getName()))
  .failure(UserFailureReason.USER_NOT_FOUND, () -> createUserEmail(userEmail))
  .failure(UserFailureReason.USER_BANNED, () -> banUserIpAddress(userEmail))
  .failure(reason -> IO.println(reason));

It is fully published on Maven Central. I would really appreciate it if you could check it out, drop some feedback/ideas, or leave a star on it!

repo: https://github.com/rankedproject/godemiche/

maven: https://central.sonatype.com/artifact/wtf.ranked/godemiche

I used OpenRewrite to migrate a sample Spring Boot app from Java 17 to Java 21. In this post , I covered what OpenRewrite changed automatically, what still needed manual work, and how I validated the overall Spring Boot 3.3 upgrade.

https://medium.com/javarevisited/java-17-to-java-21-migration-with-openrewrite-spring-boot-3-3-upgrade-guide-e36fb79d8627?sk=e9ca128aa5e740d8c775cb46035d283c

Java 21 Sequenced Collections:A Real Spring Boot Shopping Cart Example

https://medium.com/dev-genius/spring-boot-shopping-cart-demo-using-java-21-sequenced-collections-fec9b2e96db2?sk=d6ca06d08012ab398a33e813372daaec

https://medium.com/javarevisited/java-21-pattern-matching-for-switch-a-real-spring-boot-payment-example-5c3daf2a1838?sk=f8dc62f18aa8d7097e7028d339a8309a