You wrote a test with @DataJpaTest but your repository bean is null during the test. What is the most likely cause?

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Spring Boot - Testing Spring Boot Applications

You wrote a test with @DataJpaTest but your repository bean is null during the test. What is the most likely cause?

AYou used <code>@SpringBootTest</code> instead of <code>@DataJpaTest</code>

BYou forgot to annotate the repository field with <code>@Autowired</code>

CYou did not add <code>@Entity</code> to your entity class

DYou did not include <code>@Test</code> on the test method

Step-by-Step Solution

Solution:

Step 1: Check repository injection
If the repository field is null, it usually means Spring did not inject it because @Autowired is missing.
Step 2: Verify other options
Using @SpringBootTest won't cause null injection, missing @Entity causes other errors, and missing @Test does not affect injection.
Final Answer:
Missing @Autowired on repository field -> Option B
Quick Check:
Null repo = missing @Autowired [OK]

Quick Trick: Always use @Autowired to inject repositories in tests [OK]

Common Mistakes:

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