Gtk-WARNING: cannot open display:

#26213

Hello,
I am ejecuting the demo PHP application and I get the following error in stderr.txt file
(.:4214): Gtk-WARNING **: cannot open display:

What did I miss?

Any help would be apreciated.

Thanks

#27345

Obviously you run PD4ML on Linux or UNIX platform.

In the case make sure that -Djava.awt.headless=true JVM command-line parameter is set. The “headless” mode prevents Java from attempts to connect/use “display resources”. It is important for server environments: as a rule they do not assume any connected display hardware.

#27346

Additional info: it seems GNU JDK 1.4.2 implementation does not respect
-Djava.awt.headless=true setting and it makes PD4ML to fail.

Possible solutions:

• upgrade the JDK
• change to Sun’s JDK
• use xvfb daemon

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