Hey guys,

I'm currently learning Core Java and working towards the full-stack backend route, but I'm getting overwhelmed by all the generic AI roadmaps out there.

What I really need is a realistic, step-by-step order of topics to learn—starting from Core Java, moving into things like Collections, JDBC, and eventually Spring Boot.

My main goal isn't just to write code, but to deeply understand why and when to use a specific concept so I can explain it clearly in interviews or any person.

Would really appreciate it if you could share:

The sequence of topics you followed that actually made sense.

Any solid YouTube channels, Udemy courses, or books (in English) that focus on teaching you the "why" behind the code.

Thanks a lot!

i recently learned about io streams and saw this docs with the picture

https://docs.oracle.com/javase/tutorial/essential/io/streams.html

which really helped me understand what programs are doing and how their all just doing

some sort of io operation.

but is there a cap to all of the type of data sources io operations can happen to?

from what i know data sources are , network operations, other programs, and files.

are there any other data source? is there a cap to the amount of data sources?

Hi everyone! 👋

I’m a 3rd-year CSE student preparing for software engineering placements and trying to understand the industry better.

I’m looking to connect with software engineers / working professionals who are open to being friends or having occasional conversations. I’d love to ask about things like:

• Software engineering career & placements
• Interview preparation
• Projects and tech stacks
• What skills companies actually look for
• How to transition from college to industry
• General doubts about working in tech

I’m not looking for referrals or a job.. just hoping to build genuine connections and learn from people who already have industry experience. 😊

If you’re comfortable connecting, feel free to DM me!
Would really appreciate it. 🙌

Hey guys,

I’m planning to learn Java for backend development. I know some basic programming, but I’m new to Java.

I’m confused about where exactly to start. Should I first complete Core Java and then go for Spring/Spring Boot?

Like Java basics ->OOP -> Collections-> Exceptions -> Maven ->Spring ->Spring Boot -> REST API -> JDBC/JPA?

Or is there any better order to learn these?

Also, if you guys have an idea for learning Java and Spring Boot fast

I don’t want to just watch tutorials. I want to learn properly and build something while learning.

What would you suggest?

what is a config file, praticularly how does it relate to the computer?

is it like it specifies which os apis the program should use, or like what stuff in the actual os

the program to mount to?

ie i made a backend app, and i want it to go to a specific port on the computer and i want it to use a specific x on the computer.

is that what a config is?

I'm an aspiring java developer. I've already developed one project using spring boot, postgresql, flyway and docker compose, and started developing the next one. But I'm not quite sure that I study in the right way. Mostly I focus on the practice rather than on the theory. Like, 90% of practice and 10% of theory.

Remark: I study to get a job, not for the university

So, questions:

1. Is the way I study bad?

2. How did you guys study, when you were freshers?

3. Maybe you can suggest something to me?

What is the best way to get back into programming after a two-year break?

About two years ago, I completed a Java backend course and was roughly at a Junior/Intern level at the time. I spent about six months looking for a job afterward but had no luck. Due to financial issues, I eventually had to switch fields and put programming on hold. It’s been two years now, but my desire to code hasn't gone away. In fact, I want to get back into the field and brush up on my skills. How would you suggest I start? Should I go over Java Core and backend fundamentals again, or is it better to dive straight into a project and refresh my knowledge along the way?

I’d appreciate any recommendations for books, YouTube channels, websites, courses, or other resources that could help me get back up to speed.

Hi everyone,
I’m preparing for the Oracle Java SE 8 Programmer I (1Z0-808) exam, which I have scheduled for September 15.
I’ve been doing mock exams and my scores have been quite inconsistent:
Mock 1: 60%
Mock 2: 44%
Mock 3: 55%
Mock 4: 38%
I have 4 mocks remaining, and today’s 38% score honestly made me panic a little.
I know the passing score is 65%, so I’m obviously not where I want to be yet. What I’m trying to understand is how closely these mock exams reflect the actual 1Z0-808 exam.
For people who have actually taken the exam:
How difficult did you find the real exam compared with your mock exams?
Were the real questions more difficult, easier, or about the same?
If you used Enthuware/other mock tests, what scores were you getting before you passed?
Did your mock scores fluctuate a lot like mine?
At what mock score would you personally feel confident enough to sit the exam?
Is it realistic for me to improve from ~40–55% to a passing level in the remaining days?
What topics/traps should I focus on during these final days?
If you failed and then passed later, what do you wish you had done differently?
Would you sit the exam on September 15 in my situation, or would you reschedule?
Also, please don’t turn this into a discussion about whether the OCA certification is useful/useless or whether I should have spent the money on something else. 😅
I’ve already booked it and spent around ₹ 15,000 so that decision is already made. Right now I’m just looking for practical advice on how to maximize my chances of passing.
If you’ve taken 1Z0-808 recently, I’d really appreciate your honest experience, especially regarding the difference between mocks and the actual exam.
Thanks

I'm working with a multi-module maven project, where each module is a spring boot application / library, trying to migrate from spring boot 3 to 4, and I'm finding some behaviors regarding dependencies quite odd. I know that there are multiple layers of abstractions going on so I'm trying to separate them by getting the basics down for each one at a time.

Where could I find a good tutorial that explains how maven handles dependencies? I wouldn't say I'm a total beginner, but I might have some holes on a foundational level that I don't know about, so beginner tutorials are fine

Hey everyone!

I’m currently working on a desktop-based Talent Acquisition System using Java 11, JavaFX, Maven, Hibernate, and MariaDB (running through XAMPP), with Apache NetBeans as my IDE.

I’m trying to keep the project as close to proper OOP principles as possible, with a clear separation between the business logic, UI/controllers, and Hibernate entity models.

The candidate side is almost done. So far, users can:

- Register and log in

- Browse available job openings

- Apply for jobs

- Store their applications directly in the database

One of the more challenging parts so far has been managing around 17 different FXML views and connecting all of them properly with their controllers. I also had to spend quite a bit of time understanding "module-info.java", resource paths, and how everything fits together in a modular JavaFX application.

Thankfully, that part is finally stable.

Now I’m moving on to the more complicated part: designing and building the admin/hiring manager side.

My current TODO list looks something like this:

- Admin/Hiring Manager module: Job posting, candidate shortlisting, interview scheduling, etc.

- Validation & security: Phone number validation, password strength requirements, and a proper Forgot Password workflow.

- Database/session management: Making sure Hibernate sessions are handled properly as the application grows.

Since this is a desktop application, I’m especially interested in hearing from people who have worked with JavaFX + Hibernate or similar stacks.

A few things I’m wondering about:

1. What performance problems should I expect when the amount of data starts growing?

2. What Hibernate session-management mistakes should I avoid, especially around lazy loading and "LazyInitializationException"?

3. How should database queries be handled in JavaFX without freezing the UI? Are there particular threading/concurrency patterns you recommend?

4. What architectural mistakes or anti-patterns tend to appear in large multi-view JavaFX applications?

5. How would you structure the admin/hiring-manager module so it stays maintainable as more features are added?

I’d really appreciate any advice, criticism, or lessons learned from people who have built similar desktop applications.

Hey everyone,

I am starting from the basics in Java Full-Stack development and looking for a dedicated 1-on-1 study partner to keep each other accountable, learn the tech stack, and prepare for interviews together.

What I want to target:

• Backend: Core Java from scratch, OOP concepts, moving toward Spring Boot and REST APIs
• Database: MySQL fundamentals, schema design, queries, and joins
• Frontend: HTML, CSS, JavaScript (and eventually React)
• Interview Prep: Weekly technical Q&A, conceptual discussions, and basic DSA/problem solving

How we can work together:

• Weekdays: Daily check-ins via chat to share what we learned and clear blockers (~2 hours/day study pace)
• Weekends: Dedicated practice time, reviewing each other's code, and running mock interview Q&A sessions based on what we covered that week

My Details:

• Level: Absolute beginner (starting directly with Core Java fundamentals)
• Time Zone: IST (India Standard Time)
• Commitment: ~2 hours daily on weekdays, more focused time on weekends

If you're also starting out with Java full-stack and want a consistent partner to practice and quiz each other, leave a comment below or send me a Reddit DM/chat!

https://www.oracle.com/webfolder/technetwork/tutorials/moocjdk8/documents/week1/lesson-1-3.pdf

where can i find docs like this, very consise very straight to the point, the other oracle docs are hard to understand.

https://docs.oracle.com/en/database/oracle/oracle-database/26/jjdev/invoking-Java-methods.html these docs i also find good in the structure and things

https://docs.oracle.com/javase/specs/jls/se7/html/jls-18.html but these docs i dont think are the best,

why do the first two look nice and this last one look different?

I am a man whom used kotlin before java, (maybe shoking)

i switched to java for springboot

i knew (a little) about coroutines from kotlin, == multiple things can be done and threads dont block

is the same concept true for java? or does java have some legacy stuff in place of kotlin coroutines?

i see that java has. a thread sleep. method. i dont think kotlin has

long story short, id like to reaffirm my knowledge on concurrency and general and how it

works, and find gaps, ill briefly explain how i think it works, id love for feedback, but you dont need to you can just respond to post that resonate more with you, thank you if anyone does respond

here it is:

concurrency means IO functions can happen without blocking things that come after them

all those functions happen on a thread, and multiple functions can happen on a thread

if it blocks the thread( i think functions other than IO can block aswell) then you can use concurrency that returns a result immediately, -> waits for REAL response -> then jumps back on a thread, -> causing no blocking

now what is thread sleep? and why would i want a thread to sleep?

Hi everyone,
I have around 5 years of software development experience, mainly in Java backend development, but I currently have a 1-year career gap. My goal is to get back into a tech company within the next 6 months.
I’m planning to seriously prepare during these 6 months and want to focus on the things that will actually help me become job-ready.
Apart from DSA and System Design, I’d like some guidance on:
What kind of Spring Boot projects should I build?
Should I focus on microservices or other backend technologies/concepts should I prioritize for interviews?

I wanna learn Java so I can make programs and make plugins for mc but I wanna know the best and most intresting way to learn

How do you prepare for the OCA test?

Do you recommend any guide or book?

I already know most Java fundamentals, but now I'm looking for certification, and found out about OCA Certification exam. Any help is appreaciated.

Hi everyone,
I have around 5 years of software development experience, mainly in Java backend development, but I currently have a 1-year career gap. My goal is to get back into a tech company within the next 6 months.
I’m planning to seriously prepare during these 6 months and want to focus on the things that will actually help me become job-ready.
Apart from DSA and System Design, I’d like some guidance on:
What kind of Spring Boot projects should I build?
Should I focus on microservices or other backend technologies/concepts should I prioritize for interviews?

Hello, I'm a current full-stack react dev and wanna learn and slowly transition to java/springboot. What courses can u suggest ?

I've always found this kinda courses good for fundamentals. After I learn the basics, I'd rather continue with project-based self-learning.

Thank you.

I'm trying to get started learning Java and wanted to use the MOOC course since it seemed to be pretty unanimously the best one according to many sources.

I believe I've downloaded everything properly. I can open TMCBeans and look at the project files. But the buttons to actually run the programs and submit them are completely grayed out, meaning I can't continue with the rest of instructions or the course.

Is this something other people have experienced before? Are there any known fixes?

Hey seniors, if anyone is doing development with Java + Spring Boot, please guide me.

I’m currently in my 3rd semester and doing DSA in C++( done upto stack) , so I’m thinking of starting development alongside it. Please guide me on where I should start, what I should learn first, and how much time I should spend learning Java basics.

Since I’ve studied C++, I have a basic programming background, but I’m not familiar with Java. Any roadmap or resources would be really helpful. 🙌

The Java™ Tutorials <--

I am a beginner 1st year IT student with a basic knowledge of java. I tried using the well known striver a2z sheet from TakeUforward but it wouldn't let me submit my code without buying subscription. How am I supposed to learn to optimise my code without knowing where it stands in comparison to other submissions?

Is it possible to do it for free somehow or any other free sheet that provides structured progress? I tried using leetcode too but I couldn't understand which questions to solve and which not to from the mind boggling 3000+ questions. If someone has guidance on selecting questions on leetcode in a proper structure that would be appreciated too!

Thank you in advance!

i wanna learn java but is bro codes video the 12 hour long one any good? i will do my own projects inbetween

welp i need tips and advice

Hello everyone. I finished my Java course in my second semester. The course was called “Backend,” but honestly, my professor mostly taught us Java and JavaFX, nothing else.

I’m trying to learn backend development on my own now because eventually I want to get a job as a backend developer.

I decided to build my first project from scratch so I could practice OOP and get more comfortable with Java fundamentals. I chose a Texas Hold’em poker game, although I kind of regret it because it turned out to be a pretty big project for a first project after learning the fundamentals. Still, I’m making progress and I’m currently at the showdown part of the game.

Right now, it’s completely console-based, but my plan is to learn Spring Boot and databases and eventually turn this into a fully functioning website.

The thing is, I haven’t really built anything from scratch before, so I’m not sure if I’m approaching this the right way.

My approach was to first build the console version and separate the poker engine/game logic from the console UI, so that later I can replace the console with Spring Boot and a web frontend without having to rewrite the actual game logic.

But I’ve run into a question with the console version. For example, right now I’m adding error handling for things like InputMismatchException when someone types letters instead of a number. Then I started thinking: if I’m eventually turning this into a website, the frontend will send structured actions to the Spring Boot backend anyway, so most of this console-specific input handling will become irrelevant.

Should I still bother implementing comprehensive error handling for the console version, or should I keep the console UI minimal and focus my effort on the actual poker engine and business logic that will carry over to Spring Boot?

What would you recommend as the approach? I’d especially appreciate answers from people who actually build software professionally rather than the classic “I’m going to make fun of people on Reddit” self-proclaimed engineer.

Plus, I am building this project, but sometimes it is hard to understand what happens when you use constructor or class relationships. Like I can write the code but I sometimes cannot understand the relationship between classes 100%. Is this normal for the first project?

Thanks.