Spring Boot 3

Question 1

What are five key features of Spring Boot ?

Answer 1

• Spring Boot Starters
• Spring Boot Autoconfiguration
• Elegant configuration management
• Spring Boot Actuator
• Embedded servlet container

Question 2

What is a Spring Boot starter ?

Answer 2

A preconfigured module of library dependencies to get started working with a specific technology e.g. Spring Batch, Spring MVC, Spring Security etc…
So, for example the Spring Data Jpa starter contains the dependencies for Spring Data JPA and Hibernate (as Hibernate is a popular JPA implementation)

Question 3

What is a Spring Boot Autoconfiguration ?

Answer 3

Spring Boot takes an opionated view of configuration.
Configuration is determined by
presence/absence of a bean
system property
class in a classpath

Question 4

What is elegant configuration management ?

Answer 4

Spring Boot supports having separate config files for different profiles

Question 5

What is Spring Boot Actuator ?

Answer 5

Helps to determine details of a running application, health check metrics
All this available out of the box.

Question 6

What is a composed annotation ?

Answer 6

This means it is a compound annotation…
e.g. @SpringBootAnnotation is actually many annotations rolled into one

@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@SpringBootConfiguration
@EnableAutoConfiguration
@ComponentScan(
excludeFilters = {@Filter(
type = FilterType.CUSTOM,
classes = {TypeExcludeFilter.class}
), @Filter(
type = FilterType.CUSTOM,
classes = {AutoConfigurationExcludeFilter.class}
)}
)