Hi all, Has anyone used spring reactive framework ie complete non blocking io ( in Java) in production environment. What were the roadblocks faced and effect on performance and throughput of applic...

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Hi all,
Has anyone used spring reactive framework ie complete non blocking io ( in Java) in production environment. What were the roadblocks faced and effect on performance and throughput of application?

Spring reactive in production

Senior Software Engineer

Spring reactive in production- Grapevine

Welcome to Software Engineers's Private Community

Hello everyone,

It's been a while for me to work upon the JAX-RS Rest Web services implementations in a project at the current org. I know Spring boot also, but don't have the industrial experience on it. Do frameworks become hurdles, while switching to another firm, to an extent of not even getting shortlisted for interview/OA?

Relating it with other languages, like python, I know that companies are willing to take up risk if one has experience in any one of the popular fw like django, flask etc. But what about the less known/heard frameworks?

Backend Frameworks | Java

Software Developer

Hello community,

This post is for getting guidance/opinion on the role switch from support role to development role. I really need help from fellow colleagues and exp professionals to proceed further.

So, I had 2.5 years of experience in SAP domain and recently I have switched internally (within the org) to the software engineering team that has complete back end work to do for a foreign client. Tech-stack is Java 17, Eclipse Jersey, MySQL, MongoDB, Azure Cloud and some other technologies too.

Parallelly I have been a part of an online platform for software engineering courses (eg. Bosscoder etc), where I learnt DSA, spring boot, HTML, CSS and JavaScript with React framework. The front end engg. part is not covered yet, but a part of the curriculum.

Now my doubt is, I am planning to work for some months here and in my resume, stretch the starting time of the SWE role,  to shadow down the SAP experience. Like 4-5 months experience shown as a year or so. Tell me if it can be a good strategy to reduce barriers of not having experience to join SDE roles in prod-based MNCs. (I know, that I will have to showcase deserving skills, based on experience, in the next company to get an offer, but still!)

Secondly, can the backend framework (Jersey) become a barrier to the job switch to java spring boot roles. Some people told me that experience matters and not the frameworks. I need ur opinions.

Lastly, I am recruited as a Senior software engineer, I will have to prove my worth not just to other companies, but  internally within the team. How can I learn more in less time, to equalise the skills with the job role, not 100% but even 60-70% would work. Where to start, what to take care?!

Job Switch: Seeking help

Just how do you scale? Do you use AWS auto-scaler for that?

How do you solve for peak concurrency? >10,000 users at one point?

Seems like you are early in your DevOps/BE journey. The way you do it is:

1. Build performant APIs. <300ms is good and <100ms is great.
2. Cache all db calls wherever you can.
3. Cache all recurring calls to internal objects.
4. Profile your code and reduce time complexity.
5. Spread out API calls across several workers by mutithreading.
6. Use a load balancer and dynamically allocate more or less servers to it basis CPU util or Requests per second.

Product Manager

Challenges faced while working on java projects

1. **Memory Leaks**: One challenge I faced was identifying and fixing memory leaks in a Java application. I used profilers like VisualVM or YourKit to analyze memory usage and identify objects that were not being garbage collected properly. Then, I reviewed the code to ensure proper resource management, such as closing streams and releasing references when they were no longer needed.

2. **Concurrency Issues**: In a multi-threaded Java application, I encountered race conditions and deadlocks. To solve these issues, I carefully reviewed the code to identify critical sections and synchronized access to shared resources using locks or concurrent data structures like ConcurrentHashMap. Additionally, I used tools like Java's built-in concurrency utilities and frameworks like Akka to manage concurrency more effectively.

3. **Performance Bottlenecks**: Optimizing the performance of a Java application was another challenge. I used profilers to identify bottlenecks and hotspots in the code. Then, I applied various optimization techniques such as algorithmic improvements, caching, and tuning JVM parameters like heap size and garbage collection settings to improve overall performance.

4. **Integration with Legacy Systems**: Integrating a Java application with legacy systems using outdated technologies and protocols was challenging. I leveraged libraries like Apache Camel or Spring Integration to abstract away the complexities of communication protocols and data formats. Additionally, I wrote custom adapters and converters to bridge the gap between the modern Java application and legacy systems.

5. **Handling Big Data**: Processing and analyzing large volumes of data efficiently posed a challenge. I used frameworks like Apache Spark or Hadoop to distribute data processing tasks across multiple nodes and scale horizontally. Additionally, I optimized data processing pipe

Source: chatgpt

Most common question in an interview

Software Engineer

I'm from a non-CS background but managed to learn Spring Boot, React Js at my college time. Now I'm going to complete 1 year at my company and don't have much experience apart from a small backend project (initial stage project) and some testing work. I spent my weekend learning Apache Kafka and made some basic projects (producer-consumer) using Apache Kafka and Spring boot to get knowledge of integration and working. I'm also trying to learn and use Kafka Streams in a project. Should I continue this and make a project or should I not mention Kafka in my resume as it is a big technology and it will backfire on me in an interview as being less experienced ( I consider myself a fresher only) and using such big technology? 
If I can write Kafka in my resume then what kind of preparation do I need to do? Should I learn some other concepts around it as well?

Should I add Apache Kafka as a tech stack in my resume?

I'm a final year Btech student, I got selected in virtusa, LTIMindtree and dxc at the package of 5.5, 4 and 4.2
My friends are doing internships at good companies and I'm just looking for better opportunities.
I have a knowledge of core java, and basic dsa. 
What should I do to go to product based companies? 
Should I prepare dsa, or do j2ee or switch to react and nodejs or something else?

Need guidance

RPA Developer

Hi Grapevine, 

I'm Arnav, Director of Engg at Jio Cinema. I previously exited my startup to Scaler. Some of you may know me from ScalerPod. I've also led engineering teams at Zomato & Target. 

Here to chat with you about my journey in startups, leading engineering teams, and products at scale, among other things.

Ask me your question. I'll be back at 8 pm and begin answering!

I'm Arnav Gupta, Director of Engineering at Jio Cinema. Ask me anything!

Why is jiocinema so effin horrible to use on Samsung tvs ? Just fix this shit already.

Intern

Personally for me? Shifting from pandas to polars for data related tasks changed my life. Code remained similar in syntax but the systems became more performant at extracting efficiency out of the same machine. 

Using connectorx for interfacing with the postgres servers was also a gamechanging moment instead of the OG pd.read_sql_query.

Across both of these minor changes, on moderate to large datasets, we achieved a near 10x improvement in querying data + doing operations on them.

As a Software Engineer, which library or framework was a gamechanger for you?

Robotics Engineer

Without a job in hand and now I am fucking scared that no one will hire me.

Fuck this shit.

Guys, I did it! I quit my toxic boss.

I was told during covid that they will cut my salary in KPMG because they are doing it for all employees who are contractors.  
 I said fck it and left the job.  Got an opportunity with ey within next 1 month. Always have faith in your degree, your skillsets and your capabilities.

Senior Consultant

Brand Marketing Manager

Hello everyone. 

I am looking for a Java Developer role in startups. I have 10 months experience till now and want to switch. I have knowledge of Java, Core Java, Java 8, Spring boot, Spring batch, Reactive programming, Javascript, Reactjs. I also have knowledge of AWS and am currently learning Apache Kafka for expanding my knowledge. 
I have completed 2 internships and also have been building apis for the backend in my current organization but next month my project is going to end and I'll be moved to the bench where I need to sit for the next 8 months if I stay. 
If someone has any job opportunities for me let me know.

Looking for Java Developer role

Should I learn Sprig Data JPA? Is this still relevant? What are the latest DB technologies I should learn as a Software Developer?

Spring Data JPA, still relevant?

Welcome to Indian Startups's Private Community

Looking for a Java Developer job

Hi guys,

I am a warehouse manager and I am fed with this role. I want to learn how to design and develop this WMS/TMS softwares. Unfortunately I work in Amazon which has its own WMS/TMS softwares and hence I am not getting exposure to work on softwares like blueyonder, Manhattan etc. 

I have engineering background but no programming skills. What skills/languages do I need to learn to get an entry level job ins these SCM software developing firms?

If any of you techies can help me show a path it would be really helpful

Thanks

What skills to learn to be able to support/develope WMS softwares

Supply Chain Manager

LeetCode is a psyop designed by Big Tech to hire rule-followers who can grind away at pointless tasks

Make yourself then

Q. I want write the most sophisticated code as I am not sure if I am using the best practices in the industry like securing pages, API calls, components etc. I use react js. Where can I learn the best coding practices a professional should follow... 
2. I have another query as well.. 
We use next js just for front end and we are not utilising it's full potential like ssr etc. Is it worth using just for front end? People in my company say it provides better route structure but on the contrary.. React feels like a play ground whereas next is limited in provided libraries. What do you have to say.

Want to learn state of the art front end practices in react js

Frontend Engineer

Need referral for Java, Spring Framework 2.5+ YOE in a product company. Knowledge in Payments domain.

Spring reactive in production

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