[Solved] This docker-compose.yml snippet causes an error:services: app: image: springboot-app ports: - 8080:8080 environment: - SPRING_PROFILES_ACTIVE=devWhat is the cause of the error? | Spring Boot

Spring Boot - Docker and Deployment

This docker-compose.yml snippet causes an error:

services:
  app:
    image: springboot-app
    ports:
      - 8080:8080
    environment:
      - SPRING_PROFILES_ACTIVE=dev

What is the cause of the error?

AEnvironment variables cannot be set as list

BPort mapping should be a string with quotes

CImage name must include a tag

DPorts key is missing

Step-by-Step Solution

Solution:

Step 1: Check port mapping syntax
Port mappings must be strings in quotes like "8080:8080". Without quotes, YAML interprets it as a number causing error.
Step 2: Validate environment and image
Environment variables can be a list, and image name without tag defaults to latest, so no error there.
Final Answer:
Port mapping should be a string with quotes -> Option B
Quick Check:
Port mappings require quotes in YAML [OK]

Quick Trick: Always quote port mappings in docker-compose YAML [OK]

Common Mistakes:

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