Amigoscode Spring Boot Exercises

Guided hands-on exercises for the Spring Boot learning path on Amigoscode Academy.

Tech Stack

• Java 25
• Spring Boot 4
• H2 In-Memory Database
• Maven

Courses

This repository contains exercises for the following courses:

#	Branch	Course	Exercises
1	spring-framework-exercises	Spring Framework	5
2	spring-boot-exercises	Spring Boot	6
3	building-apis-with-spring-boot-exercises	Building APIs with Spring Boot	20
4	advanced-spring-boot-exercises	Advanced Spring Boot	20
5	spring-data-jpa-exercises	Spring Data JPA	25

Each course has a matching -solutions branch with completed code.

How to Use

1. Pick a course and checkout the exercises branch:

   git checkout spring-boot-exercises

2. Open the project in IntelliJ IDEA
3. Follow the exercises in the README.md on each branch — they are listed in order with the file to edit and what to do
4. Use the TODO tool window (View > Tool Windows > TODO) to jump to exercise locations in the code
5. Stuck? Check the solutions branch:

   git checkout spring-boot-solutions

Prerequisites

Java 25 is required. This project will not compile with older Java versions. Make sure you have Java 25 installed before starting.

You can check your Java version with:

java -version

Each course builds on the previous. We recommend this order:

1. Spring Framework
2. Spring Boot
3. Building APIs with Spring Boot
4. Advanced Spring Boot
5. Spring Data JPA

Exercise Breakdown

Spring Framework (5 exercises)

#	Topic	File
01	Create a bean with @Component	greeting/GreetingService.java
02	Constructor injection	greeting/GreetingController.java
03	Define a bean with @Bean and @Qualifier	greeting/GreetingConfig.java
04	Lifecycle hooks (@PostConstruct, @PreDestroy)	greeting/GreetingService.java
05	Stereotype annotations and wiring	user/UserRepository.java, user/UserService.java

Spring Boot (6 exercises)

#	Topic	File
01	Define the Book entity	book/Book.java
02	Create BookRepository	book/BookRepository.java
03	GET all books	book/BookController.java
04	GET book by ID	book/BookController.java
05	POST a new book	book/BookController.java
06	DELETE a book by ID	book/BookController.java

Building APIs with Spring Boot (20 exercises)

#	Topic	File
01	Create your first endpoint	order/OrderController.java
02	Return an object	order/OrderController.java
03	Return a list of orders	order/OrderController.java
04	@PathVariable	order/OrderController.java
05	@RequestParam	order/OrderController.java
06	@PostMapping	order/OrderController.java
07	@PutMapping	order/OrderController.java
08	@DeleteMapping	order/OrderController.java
09	@RequestMapping at class level	order/OrderController.java
10	ResponseEntity with status codes	order/OrderController.java
11	Create the OrderService	order/OrderService.java
12	Create the OrderRepository	order/OrderRepository.java
13	Wire layers with constructor injection	order/OrderController.java
14	@JsonProperty to rename a field	order/Order.java
15	@JsonIgnore to hide a field	order/Order.java
16	@JsonFormat and @JsonInclude	order/Order.java
17	Implement a logging filter	filter/LoggingFilter.java
18	Functional endpoint with RouterFunction	config/RouterConfig.java
19	Change embedded server to Jetty	pom.xml
20	Configure server properties	application.yml

Advanced Spring Boot (20 exercises)

#	Topic	File
01	Validation annotations (@NotBlank, @Positive)	order/dto/CreateOrderRequest.java
02	Trigger validation with @Valid	order/OrderController.java
03	@Email and @Size validation	order/dto/CreateOrderRequest.java
04	Custom validator (@ValidOrderStatus)	order/validation/
05	@ResponseStatus exception	order/exception/OrderNotFoundException.java
06	Structured error response (ApiError)	order/exception/ApiError.java
07	@ControllerAdvice global handler	order/exception/GlobalExceptionHandler.java
08	Handle validation errors globally	order/exception/GlobalExceptionHandler.java
09	Convert Order to JPA entity	order/Order.java
10	Replace repository with JpaRepository	order/OrderRepository.java
11	Derived query methods	order/OrderRepository.java
12	Custom @Query	order/OrderRepository.java
13	Seed database with data.sql	data.sql
14	Build a REST client	post/
15	@Value property injection	order/OrderController.java
16	Spring profiles	application-dev.yml
17	Replace System.out.println with Logger	order/OrderController.java
18	Spring Actuator	application.yml
19	Spring Security with Basic Auth	security/SecurityConfig.java
20	In-memory user with BCryptPasswordEncoder	security/SecurityConfig.java

Spring Data JPA (25 exercises)

#	Topic	File
01	@Entity and @Id	student/Student.java
02	@Column and @Table constraints	student/Student.java
03	Create StudentRepository	student/StudentRepository.java
04	Save students and print count	DataInitializer.java
05	Derived queries (findByEmail, findByFirstNameAndLastName)	student/StudentRepository.java
06	More derived queries (Between, Containing, GreaterThan)	student/StudentRepository.java
07	JPQL query with @Query	student/StudentRepository.java
08	Native SQL query	student/StudentRepository.java
09	@Modifying and @Transactional update query	student/StudentRepository.java
10	Sorting with Sort.by(...)	student/StudentController.java
11	Pagination with Pageable	student/StudentController.java
12	@OneToOne with @JoinColumn	card/StudentIdCard.java
13	Cascade and fetch type	card/StudentIdCard.java
14	Bidirectional one-to-one (mappedBy)	student/Student.java
15	@OneToMany relationship with Book	student/Student.java
16	Bidirectional one-to-many (@ManyToOne)	book/Book.java
17	Add/remove helper methods for Book	student/Student.java
18	@ManyToMany with @JoinTable	student/Student.java, course/Course.java
19	Add/remove helpers for Course	student/Student.java
20	Soft delete (@SQLDelete, @SQLRestriction)	student/Student.java
21	Auditing (@CreatedDate, @LastModifiedDate)	student/Student.java
22	AuditorAware and @EnableJpaAuditing	config/AuditingConfig.java
23	DTO projection	student/StudentDTO.java, student/StudentController.java
24	@Transactional transfer	account/AccountService.java
25	Test transaction rollback	account/AccountService.java

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