'Linux Unit/Service - But with GUI - JDownloader

I'm trying to run JDownloader on linux as a service so it can start with a certain user/group. But I wish not to run it headless. I would like the GUI to spawn on my desktop too! - Is there something I'm missing in this unit file?

[Unit]
Description=JDownloader Service
After=network.target

[Service]
Environment="DISPLAY=:0"
Environment=JD_HOME=/opt/jdownloader
Type=oneshot
ExecStart=/usr/bin/java -jar /opt/jdownloader/JDownloader.jar
RemainAfterExit=yes
User=jdownloader
Group=vault

[Install]
WantedBy=graphical.target

I found this in the JDownloader logfile:

java.awt.AWTError: Can't connect to X11 window server using ':0' as the value of the DISPLAY variable.

.. But I assure you that is my correct display.

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'Linux Unit/Service - But with GUI - JDownloader

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