Invalid hostname for server: local

What the exception is really saying is that there is no known server with the name “local”. My guess is that you’re trying to connect to your local computer. Try with the hostname "localhost" instead, or perhaps or ::1 (the last one is IPv6).

From the javadocs:

Thrown to indicate that the IP address of a host could not be determined. ::1 or "localhost" should always be the loopback interface, so if that doesn’t work I’d be really surprised.

If there really is a server called “local” on your network – examine your DNS settings or add it to your hosts file.

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