In a test using TestRestTemplate, you get a NullPointerException when calling restTemplate.getForEntity(...). What is the most probable cause?

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Spring Boot - Testing Spring Boot Applications

In a test using TestRestTemplate, you get a NullPointerException when calling restTemplate.getForEntity(...). What is the most probable cause?

AThe test method is missing @Test annotation

BThe endpoint URL is invalid

CThe response type class is incorrect

DThe TestRestTemplate field was not annotated with @Autowired

Step-by-Step Solution

Solution:

Step 1: Identify cause of NullPointerException
NullPointerException on restTemplate means the restTemplate variable is null.
Step 2: Check injection annotations
If @Autowired is missing, Spring does not inject TestRestTemplate, causing null reference.
Final Answer:
The TestRestTemplate field was not annotated with @Autowired -> Option D
Quick Check:
Missing @Autowired causes null TestRestTemplate [OK]

Quick Trick: Always annotate TestRestTemplate with @Autowired to avoid null [OK]

Common Mistakes:

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