PD4ML v4 Forums PD4ML v3 Archived Forums (Read Only) Troubleshooting Gtk-WARNING: cannot open display:

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  • #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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