Refer to the exhibit. Which two statements are correct regarding the HelloAutoConfig auto-configuration class when it is specified in the META-INF/spring.factories file? (Choose two.)
A.
A HelloService bean will be created from the helloService() method even if the HelloService.class is not in the classpath.
B.
A HelloService bean will be created from the helloService() method only when there is no other HelloService bean in the ApplicationContext.
C.
This auto-configuration class is used only when the HelloService.class is not on the classpath.
D.
This auto-configuration class is used only when the HelloService.class is on the classpath.
E.
A HelloService bean will be created from the helloService() method and will replace existing a HelloService bean in the ApplicationContext.
@ConditionalOnClass means that the specified class has to be on the classpath for the configuration to be applied
@ConditionalOnMissingBean means that the bean definition is only used if there is not already a bean of the given class or given name defined (manually by @Component or @Bean or by another autoconfiguration applied before)
The answers are correct.
Refer to:
1) https://docs.spring.io/spring-boot/docs/1.2.5.RELEASE/reference/html/boot-features-developing-auto-configuration.html#boot-features-class-conditions
2) https://docs.spring.io/spring-boot/docs/1.2.5.RELEASE/reference/html/boot-features-developing-auto-configuration.html#boot-features-bean-conditions
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