Spring Framework Master Class - Java Spring the Modern Way - Step 6 - Dynamic Autowiring and Troubleshooting - @Primary

The video tutorial explains the background processes of a Spring application, focusing on how Spring creates and manages beans and dependencies. It discusses the use of the @Component annotation and the potential conflicts that arise when multiple components match a type. The tutorial introduces the @Primary annotation as a solution to prioritize components. It also covers troubleshooting tips for common Spring context issues, such as bean creation errors, and emphasizes the importance of using the right combination of annotations like @Component, @Autowired, and @Primary.

What happens when two components of the same type are present in a Spring application?

• Spring throws an error due to ambiguity.

• Spring automatically chooses the first one it finds.

• Spring ignores both components.

• Spring merges the two components into one.

How can you specify which component should be used when multiple components of the same type exist?

• By using the @Primary annotation.

• By using the @Override annotation.

• By using the @Qualifier annotation.

• By using the @ComponentScan annotation.

What is the role of the @Primary annotation in Spring?

• It marks a component as the default choice when multiple beans of the same type are present.

• It ensures a component is loaded first during application startup.

• It allows a component to be used in multiple applications.

• It prevents a component from being used in the application.

What error might you encounter if no beans are found for a required type in Spring?

• NoSuchBeanDefinitionException

• BeanCreationException

• BeanConflictException

• BeanNotFoundException

Which combination of annotations is crucial for troubleshooting bean-related issues in Spring?

• @Service, @Repository, @Controller

• @Bean, @Scope, @Lazy

• @Configuration, @EnableAutoConfiguration, @ComponentScan

• @Component, @Autowired, @Primary