Java backend course from scratch, with practice from the first section
Start with logic and the language, understand how an application is organised and progress to building APIs with persistence, security and tests.
- Progressive pathway
- Verifiable exercises
- Downloadable projects
How do I start learning Java backend development?
Begin with Java syntax, methods and debugging, then learn classes and collections before adding SQL, HTTP and Spring Boot. Use a computer to run small programs and explain their results. This online pathway is available in English for UK learners and allows twelve months of access.
Your first checkpoint: a small program you can explain
Before adding a web framework, build a tiny expense tracker: accept a description and an amount, reject invalid input and print a total. Keep the calculation separate from the input so you can test it. This is a suggested practice task, not an extra course module.
Then model an expense as an object and store several expenses in a collection. If changing an input produces a surprising result, inspect the variables and method calls before copying a solution. Dev.java provides the language and object-model references below.
- Can you predict the total before running the code?
- Can you explain where invalid input is rejected?
- Can you add a test that exposes an error and then correct it?
Reference material: Dev.java: learning Java · Dev.java: classes and objects
Starting from scratch does not mean stopping at small examples
The first few weeks build a solid foundation: variables, types, conditions, loops, methods and debugging. Each concept is introduced because it solves a specific problem, rather than as a list of words to memorise.
You will then learn to represent a domain using classes, objects, encapsulation, composition, interfaces and polymorphism. That transition matters: a maintainable backend starts with an understandable model before it has controllers or endpoints.
- Small examples you can run and modify locally.
- Progressive hints before you consult a full explanation.
- Automated tests to check the expected behaviour.
- Error notebook to record failures, hypotheses and solutions.
An environment that is explained, rather than assumed
You will install a compatible JDK, an editor or IDE, Git and Maven, with separate instructions for Windows, macOS and Linux. You will also learn what each tool does and how to diagnose PATH, version and dependency problems.
Java and Spring Boot run on your computer. Use the campus to read lessons, check your progress and download the project materials. Docker can help you with PostgreSQL later, although a local alternative without containers is available.
From Java to a backend that persists data
Once you are comfortable with the language's structures, you will move on to collections, generics, lambdas, Streams, Optional, exceptions, dates, files and logging. JUnit and Mockito will help you describe through tests what should and should not happen.
The pathway continues with SQL, PostgreSQL, JDBC, JPA and Hibernate. You will design tables and relationships, analyse queries and understand the difference between the object model and the relational model before automating persistence.
- Object-oriented programming with composition before defaulting to inheritance.
- SQL written and read with understanding.
- REST APIs with validation and global error handling.
- Security and testing integrated into the project, rather than added at the end.
A 16-week plan you can adapt
The timetable proposes study, implementation, revision and assessment sessions over sixteen weeks. It is neither a countdown nor a promise of rapid mastery. You can reduce your weekly workload and use the twelve months of access available.
By the end, you will have six projects of varying complexity. The final project brings together users, roles, PostgreSQL, security, testing, OpenAPI, environment-specific configuration and a continuous integration template.
A process you can repeat for every challenge
Understanding, implementing and checking are parts of the same task.
- 01
Understand
Read the explanation and run small examples.
- 02
Modify
Change the inputs and predict the result before testing.
- 03
Build
Solve the exercise within a local Maven project.
- 04
Check
Run the tests and explain any differences.
Frequently asked questions
Specific answers about this learning pathway.
Do I need to know how to code before starting?
No. The first block introduces logic, syntax and tools. You do need to set aside time to practise and repeat exercises when you have not yet grasped an idea fully.
What computer do I need?
A computer capable of running a modern JDK, Maven and an IDE. PostgreSQL can be installed locally or run with optional Docker. The guide provides steps for Windows, macOS and Linux.
Can I study using only my mobile?
A mobile phone is suitable for reading and revision, but you need a computer to write, run and test Java and Spring Boot projects.
When is Spring Boot introduced?
After learning Java, object-oriented programming, testing, SQL and HTTP. This lets you understand what the framework solves instead of relying on memorised annotations.
Does completing the course make me a professional?
Not automatically. The course provides an extensive pathway, practice and projects, but professional proficiency requires continued practice and experience solving real problems.
Should I learn Java and Spring Boot at the same time?
Learn enough Java to read methods, objects and exceptions first. Then introduce Spring Boot through one small HTTP endpoint. You can revisit language features as a project needs them; you do not need to memorise every Java API before proceeding.
Sources and further reading
- Dev.java: learning Java — Official Java learning topics, from the first program to language features. Checked 2026-09-15.
- Dev.java: classes and objects — Reference for fields, methods, constructors and object creation. Checked 2026-09-15.
Develop this skill in the full Java backend course
Follow the programme, exercises and projects at your own pace. Review the current price and twelve-month access terms before enrolling.
KINTAVOR provides private training. Its certificate is proprietary and unofficial. Employment, salary and success in recruitment processes are not guaranteed. Third-party brands are used for descriptive purposes only, without affiliation.
Content updated: 2026-09-15.