SpringBoot

References

• https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/
• https://github.com/spring-projects/spring-boot
• https://github.com/spring-io/start.spring.io
• https://github.com/spring-io/initializr

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Spring Boot Project Folder Structure

└── MyJavaProject
    ├── src
    │   ├── main
    │   │   ├── java
    │   │   │   └── com.jd.blog
    │   │   │       └── bootstrap
    │   │   │       └── config
    │   │   │       └── conroller
    │   │   │       └── entity
    │   │   │       └── exception
    │   │   │       └── payload
    │   │   │       └── repository
    │   │   │       └── security
    │   │   │       └── service
    │   │   │           └── impl
    │   │   │        └── utils
    │   │   └── resources
    │   │       └── application.properties
    │   │   
    │   │       
    │   └── test
    │       ├── java
    │       │   └── com
    │       │       └── example
    │       │           └── MyApplicationTest.java
    │       └── resources
    │           └── test.properties
    ├── target
    │   ├── classes
    │   │   └── com
    │   │       └── example
    │   │           └── MyApplication.class
    │   └── test-classes
    │       └── com
    │           └── example
    │               └── MyApplicationTest.class
    ├── pom.xml
    └── README.md

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Featrues

Banner

https://www.baeldung.com/spring-boot-custom-banners https://www.baeldung.com/spring-boot-color-banner

Disable H2 in Spring Boot Test

• Disable H2 DB `@AutoConfigurationTestDataBase(replace = AutoConfigurationTestDatabase.Replace.NONE)

Actuator Implementation

• https://github.com/jdbirla/JD_Spring_Boot_Master/blob/master/Actuator.md
• https://howtodoinjava.com/spring-boot/info-endpoint-custom-info/
• https://howtodoinjava.com/spring-boot/actuator-endpoints-example/

All annotation

• https://github.com/jdbirla/JD_spring-master-class/blob/master/Spring_Annotatoin_world.adoc

DTO Pattern

How to follow good coding standards in Spring Boot

https://levelup.gitconnected.com/how-to-follow-good-coding-standards-in-spring-boot-a22dd735e3ec

How to call Spring Boot Rest API’s Concurrently

https://levelup.gitconnected.com/how-to-call-spring-boot-rest-apis-concurrently-e23f93448d25

Hikari configuration in Spring boot

• https://springframework.guru/hikari-configuration-for-mysql-in-spring-boot-2/

Flyway Migration

• https://springframework.guru/database-migration-with-flyway/

Using Filters in Spring Web Applications

• https://springframework.guru/using-filters-in-spring-web-applications/
• Some of the common use cases of filters are:
• Logging requests and response
• Logging request processing time
• Formatting of request body or header
• Verifying authentication tokens
• Compressing response
• Performing Image conversions

Scheduling in Spring Boot

• https://springframework.guru/scheduling-in-spring-boot/

MySQL Stored Procedures with Spring Boot

Approach 1 – @NamedStoredProcedureQuery Annotation

Approach-2 @Procedure Annotation

CREATE PROCEDURE 'GET_TOTAL_BLOGS_BY_TITLE' (IN title_in VARCHAR(50), OUT count_out INT)
BEGIN
 SELECT COUNT(*) into count_out from blog WHERE title = title_in;
END

@Repository
public interface BlogRepository extends JpaRepository<Blog,Integer> {

    @Procedure
    int GET_TOTAL_BLOGS_BY_TITLE(String title);

    @Procedure("GET_TOTAL_BLOGS_BY_TITLE")
    int getTotalBlogsByTitle(String title);

    @Procedure(procedureName = "GET_TOTAL_BLOGS_BY_TITLE")
    int getTotalBlogsByTitleProcedureName(String model);

    @Procedure(value = "GET_TOTAL_BLOGS_BY_TITLE")
    int getTotalBlogsByTitleValue(String model);

    @Procedure(name = "Blog.getTotalBlogsByTitleEntiy")
    int getTotalBlogsByTitleEntiy(@Param("model_in") String model);



}

@Service
public class BlogService {
    @Autowired
    private BlogRepository blogRepository;

    public int getTotalBlogsByTitle(String title) {
        return blogRepository.getTotalBlogsByTitle(title);
    }

    public int getTotalBlogsByTitleProcedureName(String title) {
        return blogRepository.getTotalBlogsByTitleProcedureName(title);
    }

    public int getTotalBlogsByTitleValue(String title) {
        return blogRepository.getTotalBlogsByTitleValue(title);
    }

    public int getTotalBlogsByTitleExplicit(String title) {
        return blogRepository.GET_TOTAL_BLOGS_BY_TITLE(title);
    }

    public int getTotalBlogsByTitleEntity(String title) {
        return blogRepository.getTotalBlogsByTitleEntiy(title);
    }

}

Spring Boot Caching

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Utility

Lombok

https://howtodoinjava.com/?s=lombok https://www.baeldung.com/?s=lombok

Flyway

https://medium.com/javarevisited/database-migration-in-spring-boot-using-flyway-ee791db8aea0

Java Tools

• https://github.com/jdbirla/JD_JAVA_Learning/tree/master/Java_Tools

Java Faker API

• baeldung - avaFaker library to generate real-looking fake data!.
• github ilinkj

Mapper

Model Mapper

<http://modelmapper.org/>

    private Post mapToEntity(PostDto postDto) {
        Post post = mapper.map(postDto,Post.class);
        return post;
    }

mapstruct

• https://github.com/mapstruct/mapstruct
• Mapstruct with lombok https://springframework.guru/using-mapstruct-with-project-lombok/
• pom for mapstruct + lombok https://github.com/spring-framework-guru/sfg-blog-posts/blob/master/maplombok/pom.xml

@Mapper 1
public interface CarMapper {

    CarMapper INSTANCE = Mappers.getMapper( CarMapper.class ); 3

    @Mapping(source = "numberOfSeats", target = "seatCount")
    CarDto carToCarDto(Car car); 2
}

@Test
public void shouldMapCarToDto() {
    //given
    Car car = new Car( "Morris", 5, CarType.SEDAN );

    //when
    CarDto carDto = CarMapper.INSTANCE.carToCarDto( car );

    //then
    assertThat( carDto ).isNotNull();
    assertThat( carDto.getMake() ).isEqualTo( "Morris" );
    assertThat( carDto.getSeatCount() ).isEqualTo( 5 );
    assertThat( carDto.getType() ).isEqualTo( "SEDAN" );
}