Master Hibernate and JPA with Spring Boot in 100 Steps - Step 6 - Dynamic auto wiring 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 specific type. The tutorial introduces the @Primary annotation as a solution to prioritize one component over others. It also provides troubleshooting tips for common Spring context issues, emphasizing the importance of using the right combination of @Component, @Autowired, and @Primary annotations.

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

• Spring automatically chooses the first one it finds.

• Spring merges the two components.

• Spring throws an error unless @Primary is used.

• Spring ignores both components.

How can you prioritize one component over another in Spring?

• By using @Component

• By using @Primary

• By using @Override

• By using @Autowired

What is a common error when no components are found in a Spring application?

• NullPointerException

• NoSuchBeanDefinitionException

• ArrayIndexOutOfBoundsException

• ClassCastException

Which annotation is crucial for Spring to recognize a class as a component?

• @Component

• @Service

• @Autowired

• @Primary

What should you check if multiple beans are found for a single type in Spring?

• Verify database connections

• Update the Spring version

• Check for syntax errors

• Ensure @Primary is used correctly