Spring Boot - Testing Spring Boot Applications
You wrote a Spring Boot test with Testcontainers but get a connection refused error when accessing the database. What is the most likely cause?
You wrote a Spring Boot test with Testcontainers but get a connection refused error when accessing the database. What is the most likely cause?
medium📝 Debug Q6 of 15
Step-by-Step Solution
Solution:
Step 1: Analyze connection refused cause
Connection refused usually means no database server is listening at the URL.Step 2: Check container lifecycle management
If container is not started (e.g., missing @Container), no DB server runs, causing connection refused.Final Answer:
The container was not started before the test ran -> Option CQuick Check:
Connection refused = container not started [OK]
Quick Trick: Connection refused often means container not started [OK]
Common Mistakes:
- Blaming username without checking container status
- Assuming missing @SpringBootTest causes connection refused
- Thinking image version causes connection refused
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