Trying to connect to a remote Apache Derby server. Derby server version is 10.13.1.1 (Debian Stretch), java version on remote system is openjdk 1.8.0_181.
Thanks to Lars Vogel, i’ve learned i have to run the derby server with -h 0.0.0.0 so to accept both local and remote connections. Connecting locally works fine.
Remote access (both with ij or tools like SquirrelSQL or LibreOffice Base) fails with a strange Java error:
Finally i found that it’s a matter of different derby versions. Client version of derby was 10.14.1.0. With version 10.13.1.1 on client, too, the error disappeared…