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Which two are required to use transactions in Spring? (Choose two.)
Transactions are units of work that ensure data consistency and integrity by enforcing atomicity, consistency, isolation, and durability (ACID) properties. Spring provides an abstraction layer for transaction management that supports various transaction APIs such as JDBC, JPA, Hibernate, etc. To use transactions in Spring, we need to do two things:
Enable transaction management by adding @EnableTransactionManagement annotation to a Java configuration class ortx:annotation-driven/element to an XML configuration file.
Declare transactional boundaries by annotating a class, an interface, or individual methods with the @Transactional annotation. This annotation indicates that the execution of the annotated element should be wrapped in a transaction.
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.)
B . A HelloService bean will be created from the helloService() method only when there is no other HelloService bean in the ApplicationContext.
This is true because the @ConditionalOnMissingBean annotation on the helloService() method indicates that this method will only be invoked to create a HelloService bean if there is no existing HelloService bean in the application context. This is a common way to provide a default bean that can be overridden by the user's own bean definition.
D . This auto-configuration class is used only when the HelloService.class is on the classpath.
This is true because the @ConditionalOnClass annotation on the HelloAutoConfig class indicates that this class will only be loaded and processed by Spring Boot if the HelloService.class is present on the classpath. This is a common way to enable auto-configuration for a specific library or feature only when it is available.
Which two statements are correct regarding the differences between @ConfigurationProperties and @Value? (Choose two.)
https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#features.external-config.typesafe-configuration-properties.vs-value-annotation
Which statement is true about the @PropertySource annotation? (Choose the best answer.)
This is true because the @PropertySource annotation provides a convenient and declarative mechanism for adding a PropertySource to Spring's Environment. A PropertySource is an abstraction for a source of name/value pairs that can be used by the Environment to resolve properties. The @PropertySource annotation can be used to load properties from an external file, such as a .properties or .yml file, and make them available to the application context.
https://docs.spring.io/spring-framework/reference/core/beans/environment.html#beans-using-propertysource
Which statements is true?
