VMware 2V0-72.22 Exam Practice Test Instant Access

Question 1

Which two statements are true regarding a Spring Boot "fat" JAR? (Choose two.)

AThe 'fat' JAR contains both the class files and the source files for your project.

BThe 'fat' JAR requires an external Servlet container.

CThe 'fat' JAR contains compiled classes and dependencies that your code needs to run.

DThe 'fat' JAR can contain multiple embedded application servers.

EThe 'fat' JAR is created by the Spring Boot Maven plugin or Gradle plugin.

Answer : C, E

Question 2

Spring puts each bean instance in a scope. What is the default scope? (Choose the best answer.)

Aprototype

Bsingleton

Crequest

Dsession

Answer : B

Spring supports different scopes for bean instances, such as singleton, prototype, request, session, etc. The scope determines how many instances of a bean are created and how they are shared among other components. The default scope is singleton, which means that only one instance of a bean is created per application context and it is shared by all components that depend on it.

Question 3

Which two statements are correct regarding the differences between @ConfigurationProperties and @Value? (Choose two.)

A@Value must be used for environment variables, as @ConfigurationProperties cannot access the environment.

B@Value supports relaxed binding of properties, but not property binding through SpEL.

C@ConfigurationProperties is preferable over @Value when type-safety during property binding is a concern.

D@ConfigurationProperties only bind properties from .properties files, not from .yml files.

E@ConfigurationProperties supports relaxed binding of properties, but not property binding through SpEL.

Answer : C, E

https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#features.external-config.typesafe-configuration-properties.vs-value-annotation

Question 4

Which is the correct approach to register for a bean destruction callback?

AAnnotate the callback method with @PostDestroy.

BAnnotate the callback method with @PreDestroy.

CAdd the @Lazy annotation to the bean configuration.

DConfigure the bean instance to use prototype scope.

Answer : B

Question 5

Which two are required to use transactions in Spring? (Choose two.)

AAdd @EnableTransactionManagement to a Java configuration class.

BAnnotate a class, an interface, or individual methods requiring a transaction with the @Transactional
annotation.

CA class must be annotated with @Service and @Transaction.

DA class requiring a transaction must implement the TransactionInterceptor interface.

EWrite a Spring AOP advice to implement transactional behavior.

Answer : A, B

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.

Question 6

Which two statements are true about Spring Boot and Spring Data JPA? (Choose two.)

A@EntityScan and spring.jpa.* properties can be used to customize Spring Data JPA.

BAny kind of Hibernate property can be passed to Spring Data JPA like spring.jpa.properties.xxx.

CSpring Data JPA is the only implementation for relational databases.

DScanning of JPA Entities can not be customized, the whole classpath is scanned.

EEmbedded Databases (H2, HSQLDB, Derby) are not re-created during the startup.

Answer : A, B

A . @EntityScan and spring.jpa.* properties can be used to customize Spring Data JPA.

This is true because the @EntityScan annotation can be used to specify the base packages to scan for JPA entities, instead of using the default package of the main application class. The spring.jpa.* properties can be used to configure various aspects of Spring Data JPA, such as the database platform, the DDL generation, the show-sql flag, etc.

B . Any kind of Hibernate property can be passed to Spring Data JPA like spring.jpa.properties.xxx.

This is true because Spring Data JPA supports passing any Hibernate-specific property by using the prefix spring.jpa.properties. For example, we can use spring.jpa.properties.hibernate.format_sql=true to format the SQL statements generated by Hibernate.

Question 7

Refer to the exhibit.

Assume that the application is using Spring transaction management which uses Spring AOP internally.

Choose the statement that describes what is happening when the update1 method is called? (Choose the best answer.)

AThere are 2 transactions because REQUIRES_NEW always runs in a new transaction.

BAn exception is thrown as another transaction cannot be started within an existing transaction.

CThere is only one transaction because REQUIRES_NEW will use an active transaction if one already exists.

DThere is only one transaction initiated by update1() because the call to update2() does not go through the proxy.

Answer : D

When using Spring transaction management with annotation-driven mode, the @Transactional annotation will be processed by a TransactionInterceptor that implements the AOP advice interface. This interceptor will be applied to the target bean through a proxy that implements the same interface as the target bean. Therefore, when a method of the target bean is called from outside, it will actually invoke the proxy method, which will delegate to the interceptor and then to the actual target method.

However, when a method of the target bean is called from within the same bean, it will not go through the proxy and thus bypass the interceptor logic. In this case, when update1() calls update2(), it will not start a new transaction as specified by REQUIRES_NEW propagation level, but rather join the existing transaction initiated by update1() itself.

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