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VMware Professional Develop VMware Spring Sample Questions (Q28-Q33):

NEW QUESTION # 28
Refer to the exhibit.

The above code shows a conditional @Bean method for the creation of a JdbcTemplate bean. Which two statements correctly describe the code behavior? (Choose two.)

A. @ConditionalOnBean(name= "dataSource") should be replaced with
@ConditionalOnMissingBean (DataSource.class) for greater flexibility.
B. @ConditionalOnBean(name= "dataSource") should be replaced with @ConditionalOnBean (DataSource.class) for greater flexibility.
C. A JdbcTemplate bean will be created when the DataSource class is in the classpath but there is no DataSource bean.
D. A JdbcTemplate bean will be created when a bean named dataSource has already been created.
E. The @Bean annotation should be removed.

Answer: B,D

Explanation:
The @Bean annotation is used to declare a method that returns an object that should be registered as a bean in the application context. The @ConditionalOnBean annotation is used to specify a condition for the bean creation based on the presence or absence of other beans in the application context. The name attribute of this annotation can be used to specify the bean name or names that must be present or absent for the condition to match. However, this approach is less flexible than using the value or type attribute, which can specify the bean class or classes that must be present or absent for the condition to match. Therefore, it is recommended to use @ConditionalOnBean(DataSource.class) instead of @ConditionalOnBean(name= "dataSource") for greater flexibility.
The JdbcTemplate class is a Spring class that simplifies the use of JDBC and helps to avoid common errors. It executes core JDBC workflow, leaving application code to provide SQL and extract results. To create a JdbcTemplate object, we need to pass a DataSource object as a constructor argument. The DataSource interface is a Java interface that represents a factory of connection objects. In this code, the jdbcTemplate() method takes a DataSource object as a parameter and returns a new JdbcTemplate object. This method is annotated with @Bean and @ConditionalOnBean(name= "dataSource"), which means that it will only create a JdbcTemplate bean when there is already a bean named dataSource in the application context.

NEW QUESTION # 29
Which two statements are true about @Controller annotated classes? (Choose two.)

A. The classes are eligible for handling requests in Spring MVC.
B. The @Controller annotation is a stereotype annotation like @Component.
C. The @Controller annotated classes can only render views.
D. @Controller is interchangeable with @RestController with no extra code changes for the methods inside the class.
E. The classes must be annotated together with @EnableMvcMappings to be discovered via component scanning.

Answer: A,B

NEW QUESTION # 30
Refer to the exhibit.

What is the id/name of the declared bean in this Java configuration class? (Choose the best answer.)

A. clientService (starting with lowercase "c")
B. clientServiceImpl (starting with uppercase "C")
C. clientServiceImpl (starting with lowercase "c")
D. ClientService (starting with uppercase "C")

Answer: D

NEW QUESTION # 31
Which two are required to use transactions in Spring? (Choose two.)

A. Write a Spring AOP advice to implement transactional behavior.
B. A class must be annotated with @Service and @Transaction.
C. Annotate a class, an interface, or individual methods requiring a transaction with the @Transactional annotation.
D. A class requiring a transaction must implement the TransactionInterceptor interface.
E. Add @EnableTransactionManagement to a Java configuration class.

Answer: C,E

Explanation:
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 or tx: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.

NEW QUESTION # 32
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.)

A. There is only one transaction because REQUIRES_NEW will use an active transaction if one already exists.
B. An exception is thrown as another transaction cannot be started within an existing transaction.
C. There is only one transaction initiated by update1() because the call to update2() does not go through the proxy.
D. There are 2 transactions because REQUIRES_NEW always runs in a new transaction.

Answer: C

NEW QUESTION # 33
......

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