LinkedIn Spring Framework Skill Quiz Answers

LinkedIn Spring Framework Assessment Latest Answers - LinkedIn Spring Framework Skill Quiz Answers 2021

Q1. How filters are used in Spring Web?

•  Filters are called before a request hits the DispatcherServlet.They allow for interception-style, chained processing of web requests for security, timeouts, and other purposes.
•  Filters are used with a checksum algorithm that will filter invalid bytes out of a byte stream request body and allow for processing of HTTP requests from the DispatcherRequestServlet.
•  Filters are used with a checksum algorithm that will filter invalid bytes out of an octet stream a multipart upload and allow for chained processing of WebDispatcherServlet requests.
•  Filters are used to validate request parameters out of the byte stream request body and allow for processing of requests from the DispatcherRequestServlet.

Q2. How is a resource defined in the context of a REST service?

•  A resource is the actual String literal that composes a URI that is accessed on a RESTful web service.
•  It is an abstract concept that represents a typed object, data, relationships, and a set of methods that operate on it that is accessed via a URI.
•  A REST service has a pool of resources composed of allocations of memory that allow a request to be processed.
•  A resource for a REST service is an explicit allocation of a thread or CPU cycles to allow a request to be processed.

Q3. Which of these is a valid Advice annotation?

•  @AfterError
•  @AfterReturning
•  @AfterException
•  @AfterExecution

Q4. What does a ViewResolver do?

•  It supports internationalization of web applications by detecting a user's locale.
•  It generates a view by mapping a logical view name returned by a controller method to a view technology.
•  It creates a unique view determined by the uers's browser type,supporting cross-browser compatibility.
•  It maps custom parameters to SQL views in the database, allowing for dynamic content to be created in the response.

Q5. How are Spring Data repositories implemented by Spring at runtime?

•  Spring automatically generated code for you based on your YAML config that defined a MethodInterceptor chain that intercept calls to the instance and computed SQL on the fly.
•  A JDK proxy instance is created, which backs the repository interface, and a MethodInterceptor intercepts calls to the instance and routes as required.
•  The Spring JDK proxy creates a separate runtime process that acts as an intermediary between the database and the Web server, and intercepts calls to the instance and handles requests.
•  Spring automatically generated code for you based on your XML config files that define a SpringMethodAutoGeneration factory that intercepts calls to the instance and creates dynamic method that computer SQL on the fly.

Q6. What is SpEL and how is it used in Spring?

•  SpEL(Spring Expression Language) runs in the JVM and can act as a drop-in replacement for Groovy or other languages.
•  SpEL(Spring Expression Language) supports boolean and relational operators and regular expressions, and is used for querying a graph of objects at runtime.
•  SpEL(Spring Expression Language) allows you to build, configure,and execute tasks such as building artifacts and downloading object dependencies.
•  SpEL(Spring Expression Language) natively transpiles one JVM language to another, allowing for greater flexibility.

Q7. The process of linking aspects with other objects to create an advised object is called

•  dynamic chaining
•  banding
•  weaving
•  interleaving

Q8. How are JDK Dynamic proxies and CGLIB proxies used in Spring?

•  JDK Dynamic proxy can proxy only interface, so it is used if the target implements at least one interface. A CGLIB proxy can create a proxy by subclassing and is used if the target does not implement an interface.
•  Only JDK Dynamic proxies are used in the Spring Bean Lifecycle. CGLIB proxies are used only for integrating with other frameworks.
•  Only CGLIB proxies are used in the Spring Bean Lifecycle. JDK Dynamic proxies are used only for integrating with other frameworks.
•  JDK Dynamic proxy can only using an abstract class extended by a target. A CGLIB proxy can create a proxy through bytecode interweaving and is used if the target does not extend an abstract class.

Q9. Which of these is not a valid method on the JoinPoint interface?

•  getArgs()
•  getExceptions()
•  getSignature()
•  getTarget()

Q10. In what order do the @PostConstruct annotated method, the init-method parameter method on beans and the afterPropertiesSet() method execute?

•  1. afterPropertiesSet() 2. init-method 3. @PostConstruct
•  1. @PostConstruct 2. afterPropertiesSet() 3. init-method
•  1. init-method 2. afterPropertiesSet() 3. @PostConstruct
•  You cannot use these methods together-you must choose only one.

Q11. What is the function of the @Transactional annotation at the class level?

•  It's a transaction attribute configured by spring.security.transactions.xml config file that uses Spring's transaction implementation and validation code.
•  It's a transaction must actively validate by the bytecode of a transaction using Spring's TransactionBytecodeValidator class. Default Transaction behavior rolls back on validation exception but commits on proper validation
•  It creates a proxy that implements the same interface(s) as the annotated class, allowing Spring to inject behaviors before, after, or around method calls into the object being proxied.
•  It's a transaction that must be actively validated by Spring's TransactionValidator class using Spring's transaction validation code. Default Transaction behavior rolls back on validation exception.

Q12. Which is a valid example of the output from this code (ignoring logging statements) ?

@SpringBootApplication

public class App {

    public static void main(String args[]) {

        SpringApplication.run(App.class, args);

        System.out.println("startup");

    }

}

public class Print implements InitializingBean {

    @Override

    public void afterPropertiesSet() throws Exception {

        System.out.println("init");

    }

}

•  Nothing will print
•  startup init
•  init
•  startup

Q13. Which println statement would you remove to stop this code throwing a null pointer exception?

@Component

public class Test implements InitializingBean {

    @Autowired

    ApplicationContext context;

    @Autowired

    static SimpleDateFormt formatter;

    

    @Override

    public void afterPropertiesSet() throws Exception {

        System.out.println(context.containsBean("formatter") + " ");

        System.out.println(context.getBean("formatter").getClass());

        System.out.println(formatter.getClass());

        System.out.println(context.getClass());

    }

}

@Configuration

class TestConfig {

    @Bean

    public SimpleDateFormat formatter() {

        return new SimpleDateFormat();

    }

}

•  formatter.getClass()
•  context.getClass()
•  context.getBean("formatter").getClass()
•  context.containsBean("formatter")

Q14. What is the root interface for accessing a Spring bean container?

•  SpringInitContainer
•  ResourceLoader
•  ApplicationEventPublisher
•  BeanFactory

Q15. Which annotation can be used within Spring Security to apply method level security?

•  @Secured
•  @RequiresRole
•  @RestrictedTo
•  @SecurePath

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