You built a Docker image for your Spring Boot app but when running the container, it exits immediately. Which is the most likely cause?

medium📝 Debug Q14 of 15

Spring Boot - Docker and Deployment

AThe app.jar file is too large to run in a container.

BThe ENTRYPOINT command is missing or incorrect, so the app never starts.

CThe Dockerfile uses FROM openjdk:8 instead of 17.

DDocker does not support Spring Boot apps.

Step-by-Step Solution

Solution:

Step 1: Understand container exit behavior
Containers exit immediately if no running process is specified or if the process ends quickly.
Step 2: Identify cause related to ENTRYPOINT
If ENTRYPOINT is missing or wrong, the container has no command to keep running, so it exits.
Final Answer:
The ENTRYPOINT command is missing or incorrect, so the app never starts. -> Option B
Quick Check:
Missing ENTRYPOINT = container exits immediately [OK]

Quick Trick: Always set ENTRYPOINT to start your app [OK]

Common Mistakes:

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