General :: Ubuntu 9.10 - Java Error When Starting Scripts - No X11 DISPLAY Variable Was Set

Dec 25, 2009

my java version is this

java version "1.6.0_15"
Java(TM) SE Runtime Environment (build 1.6.0_15-b03)
Java HotSpot(TM) 64-Bit Server VM (build 14.1-b02, mixed mode)

And when i am trying to run my gameserver scripts i get this error.

root:~# /home/l2jserver/login # ./ Exception in thread "AWT-EventQueue-0" java.awt.HeadlessException: No X11 DISPLAY variable was set, but this program performed an operation which requires it.

at java.awt.GraphicsEnvironment.checkHeadless(
at java.awt.Window.<init>(
at java.awt.Frame.<init>(


This is not my desktop computer but my remote server.

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Dec 26, 2010

When i ssh to server using -X, i always confuse about which display number i should export. It seems to me sometimes the display number has been used by something, so what i can do is only

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export DISPLAY=localhost:1 && xclock
export DISPLAY=localhost:2 && xclock


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Here is another output:

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I have the following scenario that doesn't seem to work normally. I have a windows 7 pc from which I am using putty to connect to my other linux servers (all running redhat 5 and 6). So here is the scenario that works and one that does not work. And I'm trying to figure out the one that does not work. Scenario that works:

From windows 7 (putty) I ssh into Linux_Server_1.

I run xclock and I see it pop up on my windows 7 pc. I am using xming on windows 7 to help me populate the display from linux to windows. One that does not work:

From windows 7 (putty) I ssh into Linux_Server_1. Then from Linux_Server_1 I ssh into Linux_Server_2.
<no output>

I try to setup $DISPLAY with localhost:10.0 or 0.0 or even my windows 7 pc ip address:0.0 ....etc Then when I try to run xclock I doesn't work.

I get these error messages: Error: Can't open display: <ip of display>

Also as a side note all our Linux servers are sitting on one subnet. My pc is sitting on another subnet. I use vpn to connect to the subnet where the servers sit from my pc.

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output: my_string if added in a bash script:

read parameter
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the above doesnt work, I also tried unsuccessfully:

the_output=java -cp /opt/my_dir/class.method [parameter]
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How can i get the output stored into the_output variable?

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# echo $PATH

How would i write a script to display permission on each folders in $PATH variable below format.

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