How to run a java swing application with Docker because docker run command throws headless exception

Question

When I try to run the java swing image getting the "Headless Exception error"

DockerFile:

FROM openjdk:8

COPY requiredlibararies requiredlibraries

COPY myjar.jar myjar.jar CMD ["java", "-Djava.awt.headless=true", "-jar", "myjar.jar"]

You need an X11 server running on the host and connected to the docker instance. — Thorbjørn Ravn Andersen
– Thorbjørn Ravn Andersen, Commented Dec 21, 2020 at 3:36
Thanks, I have installed the vcxsrv in my machine and used docker run -it --rm -e DISPLAY=${ipaddress} imagname /bin/bash — Hari Raj
– Hari Raj, Commented Dec 22, 2020 at 13:46

Hari Raj · Accepted Answer · 2020-12-22 13:49:55Z

0

The container has to interact with the Mouse Keyboard and display of the your host machine to execute the GUI. Installed X11 server on the host machine and then communicated the container with the x11 server of my host machine.

Installed vcxsrv-64.1.20.8.1.installer
Started the Xlaunch
docker run -it --rm -e DISPLAY=${ipaddress of hostmachine} image/bin/bash

answered Dec 22, 2020 at 13:49

Hari Raj

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Thorbjørn Ravn Andersen Over a year ago

Note that X11 security is an afterthought, and if you can do this, you have it most likely turned it off. Be absolutely certain that vcxsrv is not listening on a port exposed to others (configure your firewall and/or vcxsrv) or anyone can point to your machineand do nasty stuff.

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