swing application error on BBB

What is your linux script source?

i saved my script in /usr/bin/myscript.sh

#!/bin/bash

java - jar /home/debian/myapp.jar

trying to execute from my myapp.service that saved on /usr/lib/systemd/system and symliked to /etc/systemd/system

Thanks, for reply, find the complete error below

Feb 18 17:54:23 beaglebone QMServer.sh[1404]: Jar version = RXTX-2.2pre1

Feb 18 17:54:23 beaglebone QMServer.sh[1404]: native lib Version = RXTX-2.2pre2

Feb 18 17:54:23 beaglebone QMServer.sh[1404]: Exception in thread "main" java.awt.HeadlessException:

Feb 18 17:54:23 beaglebone QMServer.sh[1404]: No X11 DISPLAY variable was set, but this program performed an operati...s it.

Feb 18 17:54:23 beaglebone QMServer.sh[1404]: at java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:204)

Feb 18 17:54:23 beaglebone QMServer.sh[1404]: at java.awt.Window.<init>(Window.java:536)

Feb 18 17:54:23 beaglebone QMServer.sh[1404]: at java.awt.Frame.<init>(Frame.java:420)

Feb 18 17:54:23 beaglebone QMServer.sh[1404]: at java.awt.Frame.<init>(Frame.java:385)

Feb 18 17:54:23 beaglebone QMServer.sh[1404]: at javax.swing.JFrame.<init>(JFrame.java:189)

Feb 18 17:54:23 beaglebone QMServer.sh[1404]: at token.TokenUpdaterGUI.main(TokenUpdaterGUI.java:282)

debian@beaglebone:~$

In the OP you list the following errors:

java.awt.eventqueue3.run

java.security.accesscontroller.doPrevilidged(native method)

java.security.protectiondomain$javasecurityaccessimpl.dointersection

java.awt.eventqueue.dispatchevent

then when you state "find the complete error below"

Feb 18 17:54:23 beaglebone QMServer.sh[1404]: Jar version = RXTX-2.2pre1

Feb 18 17:54:23 beaglebone QMServer.sh[1404]: native lib Version = RXTX-2.2pre2

Feb 18 17:54:23 beaglebone QMServer.sh[1404]: Exception in thread "main" java.awt.HeadlessException:

Feb 18 17:54:23 beaglebone QMServer.sh[1404]: No X11 DISPLAY variable was set, but this program performed an operati...s it.

Feb 18 17:54:23 beaglebone QMServer.sh[1404]: at java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:204)

Feb 18 17:54:23 beaglebone QMServer.sh[1404]: at java.awt.Window.<init>(Window.java:536)

Feb 18 17:54:23 beaglebone QMServer.sh[1404]: at java.awt.Frame.<init>(Frame.java:420)

Feb 18 17:54:23 beaglebone QMServer.sh[1404]: at java.awt.Frame.<init>(Frame.java:385)

Feb 18 17:54:23 beaglebone QMServer.sh[1404]: at javax.swing.JFrame.<init>(JFrame.java:189)

Feb 18 17:54:23 beaglebone QMServer.sh[1404]: at token.TokenUpdaterGUI.main(TokenUpdaterGUI.java:282)

they don't show the same errors.

several things

1) In the second set of error messages, it says "no X11 DISPLAY variable set", which is probably why it can't display and gives you awt errors. Could you add a line to your bash script, prior to executing the java command

echo $DISPLAY

and we'll see what that returns

2) Are logged in with a bash shell?

3) Are you running the script as

bash myscript.sh

or just

myscript.sh

4) change your script

#!/bin/bash

echo $DISPLAY

cd /home/debian

java - jar myapp.jar

and see if that give a different result

Mike

ramanc51

     Key message is HeadlessException (Java Platform SE 6) and No X11 DISPLAY variable was set, but this program performed an operati...s it.

This means you need X windows environment properly set up inside the bash shell which is normally a text based environment. To overcome this, you will need to start X11 process with the application as startup. Or avoid doing any graphical commands in your source.

Clem

ramanc51

     Key message is HeadlessException (Java Platform SE 6) and No X11 DISPLAY variable was set, but this program performed an operati...s it.

This means you need X windows environment properly set up inside the bash shell which is normally a text based environment. To overcome this, you will need to start X11 process with the application as startup. Or avoid doing any graphical commands in your source.

Clem

clem57 he did say it runs from the command line, so it may just be that the DISPLAY variable is not being passed to the subprocess spawned when he runs the bash script.

he may just have to do an

export DISPLAY=value prior to running the script so that the subprocess has access to it, or add to his .bashrc

Mike

Hi Mike, on your reply to clem57, you said export DISPLAY=value, here value=?

value would be :0.0 or localhost:0.0 based on what you typed above

so

export DISPLAY=localhost:0.0

Mike

Hi Mike after changing as you said export DISPLAY=localhost:0.0, i got following error message, QMServer.service is my service to auto start my java app through QMServer.sh

debian@beaglebone:/usr/bin$ sudo systemctl daemon-reload

debian@beaglebone:/usr/bin$ sudo systemctl start QMServer.service

debian@beaglebone:/usr/bin$ systemctl status QMServer.service

QMServer.service - QMServer

      Loaded: loaded (/lib/systemd/system/QMServer.service; enabled)

      Active: failed (Result: exit-code) since Thu, 18 Feb 2016 20:11:56 +0530; 11s ago

     Process: 1936 ExecStart=/usr/bin/QMServer.sh (code=exited, status=1/FAILURE)

      CGroup: name=systemd:/system/QMServer.service

Feb 18 20:11:56 beaglebone QMServer.sh[1936]: at java.awt.GraphicsEnvironment.createGE(GraphicsEnvironment.java:103)

Feb 18 20:11:56 beaglebone QMServer.sh[1936]: at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEn...a:82)

Feb 18 20:11:56 beaglebone QMServer.sh[1936]: at sun.awt.X11.XToolkit.<clinit>(XToolkit.java:126)

Feb 18 20:11:56 beaglebone QMServer.sh[1936]: at java.lang.Class.forName0(Native Method)

Feb 18 20:11:56 beaglebone QMServer.sh[1936]: at java.lang.Class.forName(Class.java:264)

Feb 18 20:11:56 beaglebone QMServer.sh[1936]: at java.awt.Toolkit$2.run(Toolkit.java:860)

Feb 18 20:11:56 beaglebone QMServer.sh[1936]: at java.awt.Toolkit$2.run(Toolkit.java:855)

Feb 18 20:11:56 beaglebone QMServer.sh[1936]: at java.security.AccessController.doPrivileged(Native Method)

Feb 18 20:11:56 beaglebone QMServer.sh[1936]: at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:854)

Feb 18 20:11:56 beaglebone QMServer.sh[1936]: at sun.swing.SwingUtilities2.getSystemMnemonicKeyMask(SwingUtilities2....2020)

debian@beaglebone:/usr/bin$

Yeah, I don't think that is going to work, you are going to have an issue if you are trying to start this as a service that's running as a different user than the user who "owns" the display.

That's an X11 security thing. It has been a long time since I have dealt with those kinds of issues, so without having the exact environment in front of me and being able to debug it, I'm not sure I can help much more.

two things to test though

temporarily, before starting the service type xhost +, at the command line, this can pose a security risk, but it will open your display to any user until you exit X, or type xhost -

second, export the DISPLAY variable in your script

meaning at the top of your script add

export DISPLAY=localhost:0.0

you can try that

Mike

No luck mike, on your reply you said you are going to have an issue if you are trying to start this as a service that's running as a different user than the user who "owns" the display.

I don't like or want to try start service that's running as a different user than the user who "owns" the display, please let know the way to auto start my service who own display, please share me step to start my service properly without X-server issue.

The one who owns the display is the user that is logged in. You are starting a service as one of the system users, I'm not sure which one, because I don't have access to your system. X11 will prevent users from displaying things on your desktop unless you give them permission. Nothing is going to display unless the x server is started prior to the execution of the program.

There are ways to change the ownership of a process after it starts, at least there is from c, i'm not sure about java.

This is a problem that has been solved before, hopefully I've given you enough info to formulate google queries that will help you achieve the final steps.

Look into the commands I had you type

xhost

export DISPLAY

since your program runs from the command line it seems pretty clear to me that the issue is going to be one of a few things

either the program has no permission to access the DISPLAY

the program or the environment doesn't know which DISPLAY to acess

or it's a timing issue from when the application starts and the xserver is started

Mike

ramanc51

If this is a command running on a specific user, see Linux Run Command As Another User or Run as Root User. I think you can start your command when you login, read the part of this How To Launch GUI App With Upstart Script - Ask Ubuntu rather than as the init process.

Clem

Thank you Clem, issue is solved by the first link reference, this issue is solved by adding following lines in my  myscript.sh

export DISPLAY=:0.0

cd /home/debian    // my myapp.jar is  here

su - debian  -c ´java -jar myapp.jar´

Thank you Mike, your guldens was useful to know actual error that i am facing, as you said export DISPLAY is must to run my app.jar without x11 error, finally i found the user own the display by Clem reference then issue is resolved.