Additional Notes
How would you explain a common pitfall of using field injection in an interview?
Track: Java
Topic: Spring Core
Focus: Controllers, Services, Repositories
Java: Controllers, Services, Repositories
Answer
Reduced testability and immutability. Frame the concept in practical terms so you can explain it during interview discussion.
Field injection, where dependencies are injected directly into fields, can reduce testability and immutability by making it harder to create mock dependencies or ensure fields are initialized correctly. This can lead to null pointer exceptions during testing. Constructor injection is preferred because it provides clarity and immutability. For example, injecting a PaymentService directly into a field could complicate testing by making it hard to substitute with a mock.
Field injection, where dependencies are injected directly into fields, can reduce testability and immutability by making it harder to create mock dependencies or ensure fields are initialized correctly. This can lead to null pointer exceptions during testing. Constructor injection is preferred because it provides clarity and immutability. For example, injecting a PaymentService directly into a field could complicate testing by making it hard to substitute with a mock.
Topics: Controllers, Services, Repositories Java Spring Core