in28minutes Spring Boot Examples for Learning by Example

A Sample Repository for Spring Boot Topics

in28minutes/spring-boot-examples addresses the gap between reading a Spring Boot tutorial and seeing how a complete small project is organized. The repository description identifies it as code examples for material published on www.springboottutorial.com, while the repository layout separates topics into directories such as spring-boot-2-rest-service-basic, spring-boot-2-jpa-with-hibernate-and-h2, spring-boot-2-myBatis-with-h2, and spring-boot-rest-services-with-unit-and-integration-tests. The target audience is developers learning Spring Boot through Java code, especially people who already understand Maven and Eclipse at a basic level. It is also useful as a reference when you want to compare REST service patterns, persistence approaches, validation, exception handling, or testing layouts. The repository is not one deployable service. Each top-level directory appears to be an individual Maven project, so the correct example must be selected before running it.

Repository Structure and Example Categories

The project is organized by technology and use case rather than by a single application flow. REST examples cover basic services, content negotiation, exception handling, filtering, validation, versioning, HATEOAS, Swagger, and unit or integration tests. Data examples include Spring Boot 2 with JDBC and H2, JPA with Hibernate and H2, Spring Data REST, and MyBatis with H2. Other directories cover basic configuration, Kotlin configuration, SOAP web services, Bootstrap with jQuery, a React example, and a basic microservice. This layout makes it possible to compare approaches without changing the whole project. For example, a JPA example and a MyBatis example both address persistence but organize the data-access code differently. The repository does not provide a single README explanation for each directory, so the source, pom.xml, application configuration, and application entry point in the selected folder are the authoritative starting points for that example.

How a Spring Boot Example Runs

The README gives an Eclipse-based workflow rather than a CLI startup procedure. For each selected directory, the visible project convention is a Maven project containing a pom.xml and a Spring Boot application class. Spring Boot applications are identified by searching for @SpringBootApplication. When that class is run as a Java application, the application class starts the Spring Boot application context, component scanning, configuration loading, and any auto-configuration declared or activated by that project. The README does not specify a single endpoint, port, database URL, or startup banner that applies to every directory. Those values may differ between the REST, JDBC, JPA, MyBatis, SOAP, and frontend examples. The architecture visible from the repository is therefore modular by example: each folder owns its own source, dependencies, and configuration, while the shared learning theme is Spring Boot project structure and framework use.

Eclipse Setup and the First Example

The documented first use is to download the repository as a zip or clone it, unzip a downloaded archive if needed, and change into the folder containing pom.xml. In Eclipse, choose File, Import, Existing Maven Project, select the folder, and import the project. Then search for @SpringBootApplication, select the Spring Boot application file, and use Run as Java Application. The README links to installation material for Eclipse and embedded Maven, but it does not provide a project-specific command sequence, Java version, Maven version, or database startup step. Consequently, a reader should not assume that importing the repository root creates one runnable application. Import the directory containing the example's pom.xml, inspect that example's configuration and dependencies, and only then start its application class. The README also links to a troubleshooting guide for Maven and Eclipse problems.

Persistence, REST, and Frontend Boundaries

The range of examples is the repository's main strength, but it also creates a scope decision. A basic REST service directory is a different starting point from a JPA or MyBatis directory because the persistence dependencies and application configuration are not interchangeable. The H2 references in several directory names indicate that those examples use H2 as part of their stated setup, but the README does not document the complete connection details or whether every persistence example requires separate initialization. The React and Bootstrap directories add frontend concerns to a repository whose primary language is Java, while SOAP and microservice directories introduce additional web-service and deployment assumptions. Treat each directory as an independent lesson. Copying a class or configuration file from one example into another can change behavior because Spring Boot version, dependency set, package scanning, and resource files may differ. This repository is therefore better for isolated study than for assembling a single reference implementation.

Maintenance, Releases, and Licensing Constraints

The repository is not archived, and its last push was on 2026-09-13. That date indicates a recent repository update, but it does not establish that every example is aligned with the latest Spring Boot release or that the maintainers publish regular compatibility updates for each directory. No GitHub releases are listed. The README does not state the license, and no license file appears in the top-level repository entries. Users who need to copy, modify, or redistribute example code should verify the repository's licensing terms directly before relying on it in a larger project. Upgrade cost is mainly code-level rather than an application migration: examples named around Spring Boot 2 may require attention when moving to a newer Spring Boot generation, and examples using older web, security, or testing conventions may need code changes. The README does not document a rollback procedure or a compatibility matrix, so neither should be assumed.

When to Choose This Repository

This repository is a better fit than a full application framework when you want concrete Java examples for a specific Spring Boot topic, want to inspect several implementations of the same kind of service, or need a small starting point for an Eclipse learning exercise. It is a poor fit when you need one supported product, a deployment-ready backend, a defined production architecture, or a documented upgrade path. The many independent projects also mean that adopting one example requires checking its own build and configuration files rather than relying on repository-wide defaults. A practical comparison is with a framework-specific tutorial or generated Spring Initializr project. The repository offers several ready-made topic directories, but it does not state that it tracks a particular Spring Boot version, includes integration tests for every example, or provides production security and observability defaults. Those missing boundaries are the main reason to use it for learning rather than as an organizational dependency.

Editorial conclusion

Adopt this repository when you need a collection of focused Spring Boot examples and are comfortable navigating Java Maven projects in Eclipse. Do not treat it as a complete application, a production framework, or a substitute for the documentation of the Spring Boot version you choose. Verify the selected example's pom.xml, dependencies, database configuration, and expected Spring Boot version first, because the repository contains many separate projects and no release history or documented license is provided.

Frequently asked questions

Official sources

1. in28minutes/spring-boot-examples on GitHub
2. Issues
3. Project website
4. README