Docker Compose + Spring Boot + Postgres connection

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Each container has its own network interface with its own localhost. So change how Java points to Postgres: 

spring.datasource.url=jdbc:postgresql://localhost:5432/sample

To:

spring.datasource.url=jdbc:postgresql://db:5432/sample

db will resolve to the proper Postgres IP.

Bonus. With docker-compose you don’t need to build your image by hand. So change:

web:
  image: myuser/manager:latest

To:

web:
  build: .

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