Java, Hibernate, and Spring Boot Online Test

A company is designing the class hierarchy for various cache implementations:

public class Cache {}

public class DiskCache extends Cache {}

public class MemoryCache extends Cache {}

public class OptimizedDiskCache extends DiskCache {}

Select all the answers that will result in a runtime exception.

(Select all acceptable answers.)

A company wants to use Spring Boot in a web application which should use JPA as a database abstraction. The unit tests should be run on an H2 database while the production should run on a MySQL database.

Select all the things that need to be done or that will be done automatically by Spring Boot.

(Select all acceptable answers.)

Consider the following Spring bean:

@Component
public class TaskExecutor {

    @Value("${thread.count:10}")
    private int threadCount;
    @Value("worker.thread.name")
    private String threadNameTemplate;
    private AtomicInteger counter = new AtomicInteger();
    private ExecutorService executorService;

    @PostConstruct
    public void init() {
        ThreadFactory threadFactory = (runnable) -> new Thread(threadNameTemplate + counter.incrementAndGet());
        executorService = Executors.newFixedThreadPool(threadCount, threadFactory);
    }
}

Select the statements that are correct.

(Select all acceptable answers.)

The PetDAO class is used for various database operations on the Pet entity.

Finish the findNamedPetsBySpecies method so that it returns all pets of the appropriate species. The method should not return any Pets whose name field is null. The method accepts a Hibernate Session object that it should use to make the query.

For example, if the Pets table contains:

id  name   species
--------------------
0   Lady   Dog
1   Max    Cat
2   null   Camel

calling findNamedPetsBySpecies with "Cat" as the species, should return a list that contains a pet named "Max" with the id 1.