coaching-tasks

My tasks for coaching

Git

Prequisites:

• installed GitBash
• account on GitHub

Theory:

• what is repository, branch, tags
• succesfull branching model
  • https://nvie.com/posts/a-successful-git-branching-model
• Git tutorial
  • https://git-scm.com/book/cs/v2

Tasks:

1. Create own repository on github.com with README file

2. Check the ssh public key on github account

3. Clone the repository into the file system

   git clone [url]

   gitk --all

   NOTE: check git settings or run

   $ git config --global user.name "John Doe"
   $ git config --global user.email johndoe@example.com
   

4. Change the file Readme.md

5. Stash your changes

   git stash

   git stash pop

6. Commit your changes (local) with

   git gui

7. Push your commits to the remote

   git push origin master

8. Change the repository of your colleague and push it

9. Change your own repository and commit changes, then try to push it

10. Recovering from conflicts

Spring Boot

Prequisites:

• Java JDK 8 installed
• Maven installed

Basic Spring Application:

1. Visit page https://start.spring.io/
2. Customize your application properties
3. Input in box Search for dependencies:

• Web
• JPA
• Actuator
• H2
• Rest Repositories
• Lombok

4. Click on Generate Project
5. Extract zip into the git repository or folder
6. Commit your work

Theory

• Main Application class
• Annotations and Autoconfiguration
• Properties files versus .ymls
• *ApplicationTests class
• Inmemory DBS
• http://localhost:8080

First access to the database:

1. create packeges:

   • model
   • repositories
   • services

2. in model Create class Customer with attributes name, surname, age

   • @Entitie

   • Lombok annotations

   • @Id

     @Id
     @GeneratedValue(strategy=GenerationType.AUTO)
     private Long id;
     

3. in repositories create CustomerRepository interface, which extends JpaRepository

   • look up methods

     List<Customer> findBySurname(String lastName);
     
     @Query("SELECT u FROM User u WHERE u.age < 30")
     List<Customer> findAllUnder30();
     

4. in services create CustomerService class with reference to the repository (Dependency injection)

  @Autowired
  private CustomerRepository customerRepository;

//  @Autowired
//  public CustomerService(CustomerRepository customerRepository) {
//    this.customerRepository = customerRepository;
//  }
  
  public Customer getCustomer(Long id){
    Customer one = customerRepository.getOne(id);
    //operations on it
    return one;
  }

  public List<Customer> getCustomer(String surname){
    List<Customer> bySurname = customerRepository.findBySurname(surname);
    if (bySurname.size()==0){
      throw new IllegalArgumentException("No Customer with such lastname")  
    }
    return bySurname;
  }

5. Lombok and spring Autowiring

   @AllArgsConstructor(onConstructor = @__(@Autowired))
   

6. Test in JUnit

First REST full endpoint:

1. Add new package controllers
2. Add new class CustomerAPI
3. Add endpoint for reaching all customers by surname
4. Add Swagger http://localhost:8080/swagger-ui.html#/

Additional tasks:

1. Add error handler
2. Add Spring Data Rest
3. Settings: change a port of the server
4. Settings: LOG level