Java Spring Learning Journey

This repository documents my daily progress learning Java Spring and Spring Boot. Each day focuses on a different project and set of concepts.

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Day 1: Login App with Spring Boot

• Built a simple login application using Spring Boot.
• Learned about:
  • Spring Security for authentication
  • Spring Data JPA for database access
  • H2 in-memory database
  • MVC structure: controllers, models, repositories, and configuration
• Used a login HTML template and configured application properties for H2 and logging.

Main files:

• LoginAppApplication.java, HomeController.java, User.java, UserRepository.java, SecurityConfig.java, login.html

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Day 2: Spring API Project

• Created a REST API with Spring Boot.
• Practiced:
  • Building REST controllers and repositories
  • Exception handling
  • Using H2 database
  • Validation and JDBC
• Configured a simple application name in properties.

Main files:

• RunController.java, Run.java, RunRepo.java, RunException.java, Location.java

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Day 3: Runnerz App with Spring Boot 3

• Followed a course to build a fitness tracking REST API.
• Learned about advanced Spring Boot features:
  • REST controllers, repositories, data loading, error handling, and testing
  • User management, HTTP clients, and integration with external data
  • Modern Java (JDK 21), Maven, and best practices for project structure and testing
• Explored comprehensive testing and documentation practices.

Main files:

• RunController.java, RunRepository.java, InMemoryRunRepository.java, JdbcRunRepository.java, RunJsonDataLoader.java, UserController.java, UserRestClient.java, User.java

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Learning Resources

Much of the content and projects in this repository are inspired by and learned from Dan Vega's YouTube and the video Spring Boot 3 Crash Course.

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Each day builds on the previous, deepening understanding of Spring Boot and Java web development. See each subdirectory for more details and source code.