Refer to the exhibit. Which statement is true? (Choose the best answer.)

Question

Options

• ACustomerRepository should be a class, not an interface.
• BJPA annotations are required on the Customer class to successfully use Spring Data JDBC.
• CAn implementation of this repository can be automatically generated by Spring Data JPA.
• DA class that implements CustomerRepository must be implemented and declared as a Spring

• A
  7% (3)
• B
  2% (1)
• C
  89% (40)
• D
  2% (1)

Explanation

Spring Data JPA's core power is its ability to automatically generate repository implementations at runtime via proxy objects. When CustomerRepository extends a Spring Data interface like JpaRepository<Customer, Long>, no manual implementation is needed - Spring inspects the interface and creates a fully functional implementation for you.

Why the distractors are wrong:

• A is wrong because repositories must be interfaces, not classes - that's precisely what enables Spring Data to generate the proxy implementation.
• B is wrong because JPA annotations (@Entity, @Id) apply to Spring Data JPA, not Spring Data JDBC, which uses its own simpler mapping model - mixing them up is a common trap.
• D is wrong because writing a manual implementation class defeats the entire purpose of Spring Data; you never need to implement the interface yourself.

Memory tip: Think of Spring Data repositories as a contract (interface) that Spring fulfills for you automatically - you define what you need, Spring handles how it works. If the question ever suggests you must write or configure the implementation class yourself, that choice is wrong.

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