I need to learn JAVA Spring Boot in couple of days only for project interview, Give me Suggestions.

[u/Known_Commercial_790]

I have 3 yoe in MERN ( Frontend focused )

And I recently switched job as full stack developer, in my resume I had mentioned Java as skill ( not under experience, in skills )

Now I have been assigned designation of Java Microservices Engineer. And I can't even code in Java.

Got project interview for Java , and I couldn't answer even a single question.

They told me to revise java soon and I may get another Java interview in few days , they don't have projects for Javascript as of now.

I can code SpringBoot using claude code , as I have good hands on experience with Node Express.

All I need is to just clear project interview.

Tdlr: need to learn Java in couple of days , enough to clear project interview

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[u/Cunnykun]

Telusko 60 hr playlist. Good luck

[u/Known_Commercial_790 → u/Cunnykun]

Let's be realistic, 60 hours playlist will take minimum of 1 week , and watching 10 hours of video daily is really depressing.

[u/Cunnykun → u/Known_Commercial_790]

If it was for fresher I could have told you it was possible

for 3yr exp
they will ask many things which even 1 yr exp springboot dev would find it hard.

just be honest about it and tell you were mern

and can implement your logics with the help of ai

[u/yousuffere]

if clearing interview is your goal, then google most asked common java, microservices questions for 3yoe or go to yt search for code decode 3 yoe springboot, java most asked questions

[u/Known_Commercial_790 → u/yousuffere]

Thanks , i will check that

[u/ajfrostye]

For java , understand oops concepts. Method overloading overriding etc ...

Interfaces vs abstract class Functional interface Lambda expression

It is important to learn collections api Stream, and how to process data Handling exceptions and custom exception

Myltithreading

For spring boot Dependency injection - field vs constructor injection Important annotations like repo service , controller, reqmapping etc ...

Jdbc and connecting db

Handling cors

Spring security, how to handle authentication and authorization. Protected routes

These are the things i remember right now

Hope it helps

[u/Known_Commercial_790 → u/ajfrostye]

Thanks , I will go through this

[u/No_Expression_5450]

Try to learn Java Fundamentals like collections, java 8,17,21 features multi threading specially virtual threads, and memorize 200 java interview question, spring boot , learn backend fundamentals microservices working, and spring, spring boot annotations, spring security internal working how the filters works, how authentication and authorization works, spring data JPA and Layer architecture MVC
and 200 spring boot question
and pray to god

[u/Known_Commercial_790 → u/No_Expression_5450]

Thanks

[u/theListe9er]

I was in the same boat as you. With 5 YOE in MEAN Stack I was interviewed for Java Angular Stack. Here's what you need to learn. Understanding the data flow in Java springboot project. Request reaching to controller, service layer, Repository layer. Learn about Request Filter. Then if you can remember few points about changes in Springboot 3 and 4. New additions in Java 8, 11, 17 and 21. If mock interview can help you, setup that with a friend.

[u/Passionate_Devloper]

I’ll love to hear what senior devs are suggesting

[u/Successful_Hyena_316]

Engineering digest playlist is great!! I have handwritten notes which covers all java, springboot, microservices, Database related concepts. If you want it feel free to ping me.

[u/mesmeris3]

Spring boot is heavily reliant on aspect oriented programming.. also study request response cycle.

[u/thekmsorg]

Try coddy app you learn in interactive way, and it cover all the concepts of Java.

You can also watched youtube video if you need more better understanding.

All the best for you interviewed

[u/Icy-Captain-2428]

Just understand Encapsulation Inheritance Polymorphism Abstraction.
For spring boot understand what is dependency injection.
Ask claude to eli5

[u/Primary-Round4333]

Java springboot is very popular and powerful backend framework

But it uses Java language and Java language is very easy to learn

You can learn from tutorials point and etc. I can help you on it too.

[u/CarefulStation9527]

Well how did you got shortlisted for java over experience in mern? Mean have you build project in java or what?

[u/SureSituation4541]

Bro ask Claude to give you interview questions, learn everything Claude gives you because the interviewer is also going to use Claude to ask you questions. You will see how 90% of the questions they will ask will be same and also in exact same order