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Java spring boot interview Questions And Answers Rated 100%!!!
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What is implementation and interface inheritance? - ANS check chatgpt What type of exception is a null pointer exception in Java? - ANS Null pointer exception is a type of runtime exception in Java. What are runtime exceptions in Java? - ANS exception that occur at run...

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  • November 15, 2024
  • 3
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • JPA
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Spring Cert 2024 | Chapter 4 | Data JPA
Exam Questions And Answers


What is a Spring Data Repository interface? - ANS Aims to significantly reduce the amount
of boilerplate code required to implement data access layers for various persistence stores.

How do you define a Spring Data Repository interface? [2] Why is it an interface not a class? -
ANS a) Define Entity Class
b) Create an Interface (@Repository)
==> Should extend 1/4 Repository types
==> Should be parametrized w/ Entity type

public interface UserRepo extends JpaRepository<User, Long>

What is the naming convention for finder methods in a Spring Data Repository interface [4]? -
ANS 1) Verb [1/6] - {get, read, find, query, stream, count}

2) Limiter (Optional)

3) Subject (Optional)

4) Predicate [2] - consists of...
==> a) Property (required)
==> b) Comparison (optional, default is "equals")

[JAY] Regarding Spring Data Repository Interface methods' naming conventions, what parts are
optional [2]?

What part of the Predicate is optional? What does it default to? - ANS 1) Limiter - "first",
"top", etc.
2) Subject - Since Repo-Type is already parameterized w/ correct type

Predicate - Comparison is optional (defaults to "equals")

How are Spring Data repositories implemented by Spring at runtime? - ANS JDK Dynamic
Proxy - Intercepts all calls to repository
==> Routes calls to default repository impl (SimpleJpaRepository)

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