See info here at bottom of [this
page](https://jdbc.postgresql.org/documentation/use/#connection-fail-over)
> From: James Pang <jamespang886(at)gmail(dot)com>
> Subject: jdbc connection multiple host
> Date: 2024-07-30 08:28 EDT
>
> We plan to migrate Oracle to Postgresql databases. Application put
> multiple host:ip in connection string,
> jdbc://host1ip:port,host2:port/dbname , when host1 is accessible, it's
> preferred. when host1 is not accessible, host2:port is secondary.
> how to do that through Postgresql JDBC driver ?
>
> Thanks,
>
> James