Problem connecting Postgres to my Spring Boot app

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I would also guess, based on your console output, that you’ve create a database cluster, not a database. So one solution to this is to shell into your machine, get the psql environment running like so:

psql -h developemntdatabase.internal -U 'postgres'

(You may need to install this temporarily using your Linux distro’s package system. On Alpine I use apk add postgresql15-client.)

And then from there you can create the actual database:

CREATE DATABASE mydb;

The other remark I’d make is that Spring should allow you to connect without a database name. Connecting to a database server is perfectly allowable without a database name to default to, and Spring should be no different. That said, if you do this manual fix, you can just use mydb as the name.

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