🚀 go-pugleaf

Hanan Hermon <hananh@radcom.co.il> wrote:
> Hi,

> We are having a problem running a servlet which uses graphical classes on a
> Unix machine whenever the DISPLAY environment variable is not set to a valid
> value in the terminal which is running the web-server, even though the
> servlet is not sending the graphical components to the DISPLAY anyhow (it is
> sending it back to the browser that triggered it).

The JVM is using X11 support libraries for fonts, swing, and awt stuff.
Using anything in those packages will require an active X11 server and a 
DISPLAY variable which points to it.

> This is a very unwanted thing, since we need to run the web-server as a
> service on the Unix, and because of the above problem we cannot (instead, we
> have to login to the Unix, set the DISPLAY environment variable to a valid
> value, and only then run the web-server, and make sure the terminal we sent
> the DISPLAY to do not log-out as long as users are using the servlet).

A better solution to the problem is to run a virtual frame buffer X11
service on the web host, and alter the web-server's startup scripts to
also launch the xvfb server and set a DISPLAY variable which points to it.
This removes the dependency upon an external display device.

-- 
Joi Ellis (TeamB)               http://www.teamb.com/
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