SpringBeans

This project works on different techniques of creating Spring Beans and autowiring them and also working with Qualifier and Scope of the Beans. Please look through the commit history section below for changes in each iteration. Each iteration shows different types of creating beans and working with them

Table of Contents

• Prerequisites
• Getting Started
• Commit History

Prerequisites

Before you begin, ensure you have met the following requirements:

• Java Development Kit (JDK) 17 or later
• Spring framework
• Maven for building the project

Getting Started

Follow these steps to set up and run the Spring security Learner Microservice:

1. Clone this repository:

   git clone https://github.com/yr5913/spring-beans.git
   cd spring-beans

2. Build the microservice:

   mvn clean install
   

3. Run the microservice:

   java -jar target/spring-beans.jar
   

Commit History

1. Usage of @Beans Annotation -- First commit created spring beans
2. generates NoUniqueBeanDefinitionException due to ambiguity as multiple beans of same class are created
3. corrected NoUniqueBeanDefinitionException by specifying the proper name of the bean to avoid ambiguity
4. Usage of property name, value in the @Bean Annotation - How to provide user defined names to beans
5. usage of @Primary annotation to specify the default bean to the spring
6. Usage of @Component Annotation
7. Usage of @PostConstruct Annotation
8. Usage of @PreDestroy Annotation
9. Usage of registerBean() Method
10. Created Two different types of beans that has a relationship between them but didn't autowire them
11. Autowired beans using method call
12. Autowired beans using method parameters
13. Autowired using @Autowired annotation on class fields
14. Usage of @Autowired annotation with its parameter required set to false
15. Autowired using @Autowired annotation on setter method
16. Autowired without using @Autowired annotation anywhere -- by default spring does the constructor autowiring if there is only one constructor
17. Autowired using @Autowired annotation on constructor -- best practice
18. Multiple beans, using @Autowired annotation on constructor where the parameter name doesn't match with any of the multiple beans -Error UnsatisfiedDependencyException
19. Correct the above by defining on of the beans as primary
20. Usage of @Qualifier -- Also we can ge the custom bean we require from the multiple beans available by using Qualifier to mention the bean we need.
21. Circular Dependency -- error is generated
22. Implemented a Simple Project with these dependencies-- Person has a Vehicle, Vehicle uses Vehicle Services to Play Music and run on Tyres, There are multiple music players, tyres and default ones should be configured
23. Bean Scope - Singleton Pattern - check Main class for the code
24. Testing the default Eager initialization by Spring
25. Testing the Lazy initialization by Spring
26. Bean Scope - Prototype Pattern - check Main class for the code