Hi,

I need to run "Selenium" test scripts (written inside TestNG) on a headless linux server (Red Hat Enterprise Linux Server release 5.3) using Xvfb. while executing the script, I get the following warnings in the "server.log" file.

Warning: Cannot allocate colormap entry for "#c0c0c0"
Warning: Cannot allocate colormap entry for default background.

This warnings occurs when the script try to launch Firefox. Firefox is not getting launched and the code gets hanged in the middle, without executing any test case.

I suspect the problem could be with the Xvfb's screen resolution. screen resolution might be lesser than firefox's expected resolution.

we can be able to specify our own display in POM file using <display> tag. similarly can we able to specify resolution also ?..

Pls help me out. Thanks in advance.

Xvfb might be used on a headless server to test clients, for programs that expect X, but AFAIK, TestNG is used on a client to test a number of servers. It's not clear which you are trying to test, and where the test is being made.

The Xvfb manpage lists the default resolution and color depth.
-screen screennum WxHxD
This option creates screen screennum and sets its width, height, and depth to W, H, and D respectively. By default, only screen 0 exists and has the dimensions 1280x1024x8.

Thanks jschiwal for your timely reply..

Yes. I'm using TestNG to test server. I have used selenium (wrapped inside testNG) to do UI Testing on web pages residing in the same machine.. i mean, both selenium server and the website being tested are residing in the same machine (localhost).

As u said the default screen's depth is 8. I suspect this is not good enough to run firefox.

http://mojo.codehaus.org/selenium-ma...with-xvfb.html

In the above link, they have explained to use external display in the Xvfb configuration. but, when we create the screen at command prompt and give that display no in the Xvfb configuration and while build it, it shows error like " display no is already in use ".