Flyway not able to find role with postgres docker - postgresql

Question

I am trying to run my first flyway example using docker postgres image but getting the following error:
INFO: Flyway Community Edition 6.4.2 by Redgate
Exception in thread "main" org.flywaydb.core.internal.exception.FlywaySqlException:
Unable to obtain connection from database (jdbc:postgresql://localhost/flyway-service) for user 'flyway-service': FATAL: role "flyway-service" does not exist
-------------------------------------------------------------------------------------------------------------------------------------------------------------
SQL State : 28000
Error Code : 0
Message : FATAL: role "flyway-service" does not exist
at org.flywaydb.core.internal.jdbc.JdbcUtils.openConnection(JdbcUtils.java:65)
at org.flywaydb.core.internal.jdbc.JdbcConnectionFactory.<init>(JdbcConnectionFactory.java:80)
I looked up into the docker container and can see that the user role flyway-service is created as part of the docker-compose execution:
$ docker exec -it flywayexample_postgres_1 bash
root#b2037e382112:/# psql -U flyway-service;
psql (12.2 (Debian 12.2-2.pgdg100+1))
Type "help" for help.
flyway-service=# \du;
List of roles
Role name | Attributes | Member of
----------------+------------------------------------------------------------+-----------
flyway-service | Superuser, Create role, Create DB, Replication, Bypass RLS | {}
flyway-service=#
Main class is:
public static void main( String[] args ) {
var flyway = Flyway.configure().schemas("flyway_test_schema")
.dataSource("jdbc:postgresql://localhost/flyway-service", "flyway-service",
"password")
.load()
.migrate();
System.out.println( "Flyway example's hello world!" );
}
}
The migration called src/main/resources/db/migration/V1__Create_person_table.sql:
create table PERSON (
ID int not null,
NAME varchar(100) not null
);
Docker-compose yml file:
version: "3.8"
services:
postgres:
image: postgres:12.2
ports: ["5432:5432"]
environment:
- POSTGRES_PASSWORD=password
- POSTGRES_USER=flyway-service
I am running this code on MAC OSX. I assume, I am missing something obvious here, but not sure what! Any pointers would be appreciated.

Answer 1

Finally managed to figure out the issue with the help of a friend! The problem was not with the attached code but with a postgres daemon process running on the same port 5432 by an old Postgres installation.
I found the complete uninstallation procedure here. After removing the additional daemon process got only one port listening.
a$ lsof -n -i4TCP:5432
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
com.docke 654 root 50u IPv6 0x7ae1b5f8fbcf1cb 0t0 TCP *:postgresql (LISTEN)