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Here's some minor modifications:

  1. Since it listens on a network socket, make it a dependency of network.target.
  2. nohup is not needed since systemd will daemonize the executable for you.
  3. I think a separate shell script would be an overkill, so just merge it into the service file.

So the service file looks like this:

[Unit] Description=Some job After=network.target [Service] WorkingDirectory=/home/user/tmp/testout ExecStart=/bin/sh -c "java -jar /home/user/programming/tests/java/core/SocketTest/SocketTest.jar < /dev/null >/dev/null" User=dlt Type=simple [Install] WantedBy=multi-user.target 

As far as I know, there is no special caveat of running Java application with Systemd.