README.md

Spring5 beans using annotation configuration

This repo will demonstrate how to create spring beans using annotations (via java configuration) for any standalone application.

There are two ways we can create the bean

• Using component annotations • Using @Bean annotations

1. Using component scanning

1.1 We can use any one of following four annotations as appropriate.

  @Component
  @Repository
  @Service
  @Controller

In this repo example we used @Service annotation to get bean

@Service public class TechnologyServiceImpl implements ITechnologyService

1.2 Include bean packages in @ComponentScan annotation

@Configuration @ComponentScan(basePackages = "com.star.sud.using.ComponentScanAnnotation.service") public class ApplicationConfig

2. Using @Bean annotations

1.1 Create Java bean classes without any annotation.

public class TechnologyServiceImpl implements ITechnologyService

1.2 Use @Bean annotation methods in configuration class

@Configuration public class ApplicationConfig { @Bean public ITechnologyService technologyService() { return new TechnologyServiceImpl(); } }

Result of this Application:

TechnologyDetails [techId=1, techName=Java, techDescription=Welcome to Java Learning!]