Learn about the two meta-annotations that make up the @SpringBootApplication annotation in Spring Boot for the VMware 2V0-72.22 certification exam. Discover how @Configuration and @ComponentScan work together to enable auto-configuration and component scanning.
Table of Contents
Question
Which two annotations are meta-annotations on the @SpringBootApplication composed annotation? (Choose two.)
A. @Configuration
B. @ComponentScan
C. @SpringBootConfiguration
D. @SpringApplication
E. @AutoConfiguration
Answer
A. @Configuration
B. @ComponentScan
Explanation
The @SpringBootApplication annotation is a convenience annotation that combines three other annotations:
- @Configuration
- @ComponentScan
- @EnableAutoConfiguration
@Configuration and @ComponentScan are considered meta-annotations on @SpringBootApplication because they are part of its composition.
- @Configuration: This annotation indicates that the class can be used as a source of bean definitions. It is a specialized form of the @Component annotation, allowing for more advanced configuration scenarios. In the context of @SpringBootApplication, it designates the class as a configuration class.
- @ComponentScan: This annotation enables component scanning, which allows Spring to automatically discover and register beans in the application context. It scans the package of the class annotated with @SpringBootApplication and its sub-packages, looking for classes annotated with stereotypes such as @Component, @Repository, @Service, and @Controller.
The other options are incorrect:
- @SpringBootConfiguration is not a valid annotation in Spring Boot.
- @SpringApplication is not a valid annotation; it’s actually the main class used to bootstrap and launch a Spring application from a Java main method.
- @AutoConfiguration is not a valid annotation; the correct annotation is @EnableAutoConfiguration, which is the third annotation composing @SpringBootApplication. It enables Spring Boot’s auto-configuration mechanism based on the dependencies present on the classpath.
In summary, @Configuration and @ComponentScan are the two meta-annotations that make up the @SpringBootApplication annotation, enabling bean configuration and component scanning in a Spring Boot application.
VMware 2V0-72.22 certification exam assessment practice question and answer (Q&A) dump including multiple choice questions (MCQ) and objective type questions, with detail explanation and reference available free, helpful to pass the VMware 2V0-72.22 exam and earn VMware 2V0-72.22 certification.