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

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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