RE: How to use swing classes without X-server

[Halfmann, Klaus]

Serge A. Redchuk [mailto:[EMAIL PROTECTED]] wrote:
> 
> Hello All !
> 
> I want to use some of Swing classes like
> 
> import javax.swing.tree.TreeModel;
> import javax.swing.tree.TreePath;
> 
> by tomcat in environment where no X-server running.
> 
> And I see in catalina.out:
> 
> java.lang.InternalError: Can't connect to X11 window server 
> using ':0.0' as the
> value of the DISPLAY variable.
> at sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)
> at 
...
> at javax.swing.TimerQueue.run(TimerQueue.java:231)
> at java.lang.Thread.run(Thread.java:484)
> 

You can use the _model_ classes from Swing without any problem as
long as you _never_ call any real GUI-classes. What you see here
is Swing starting its backgroud notification Thread. Look in your
code what classes you actually use. (JTree would be fatal 
DefaultMutableTreeNode would be ok.)

In case you abosultely _must_ use Graphics (like awt.image.)
You can use your existsing X-Server for testing. In a live system
you should use an Offscreen X-Server (such a thing comes with Linux
for such purposes).

   | Business Operation Systems GmbH
   |  _
 / | / \ \   Klaus Halfmann,  Dipl. Inform.
|  |/  /  |  
|   \_/   |  Tel. +49(0)69-24779-0 Fax +49(0)69-24779-444
 \   /   [EMAIL PROTECTED]
 

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Re: How to use swing classes without X-server

[Tom Oinn]

"Serge A. Redchuk" wrote:
> 
> Hello All !
> 
> I want to use some of Swing classes like
> 
> import javax.swing.tree.TreeModel;
> import javax.swing.tree.TreePath;
> 
> by tomcat in environment where no X-server running.



> Huh !! I do not need X-server !!! I just want to use a pair of Swing
> classes.
> 
> Anybody know what to do ???

1) Wait until java 1.4 is solid enough to use in anger, I believe it
   gets around this problem.

2) Run the Xvfb (X Virtual Frame Buffer) on your server, and set the
   DISPLAY environment variable appropriately. We had to do this to
   get our farm nodes (no graphics) working properly.

Tom

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RE: How to use swing classes without X-server

[Randy Layman]

1.  Use JDK1.4 with its new headless command line option
2.  Use one of the psuedo-X servers (search the list archives, this
has been discussed numerous times and names of options and installation
directions should be listed).

Randy


> -Original Message-
> From: Serge A. Redchuk [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, March 05, 2002 10:40 AM
> To: [EMAIL PROTECTED]
> Subject: How to use swing classes without X-server
> 
> 
> Hello All !
> 
> I want to use some of Swing classes like
> 
> import javax.swing.tree.TreeModel;
> import javax.swing.tree.TreePath;
> 
> by tomcat in environment where no X-server running.
> 
> And I see in catalina.out:
> 
> java.lang.InternalError: Can't connect to X11 window server 
> using ':0.0' as the
> value of the DISPLAY variable.
> at sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)
> at 
> sun.awt.X11GraphicsEnvironment.(X11GraphicsEnvironment.java:5
> 9)
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:120)
> at 
> java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvi
> ronment.java:58)
> at sun.awt.motif.MToolkit.(MToolkit.java:57)
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:120)
> at java.awt.Toolkit$2.run(Toolkit.java:512)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:503)
> at java.awt.Toolkit.getEventQueue(Toolkit.java:1150)
> at java.awt.EventQueue.invokeLater(EventQueue.java:511)
> at 
> javax.swing.SwingUtilities.invokeLater(SwingUtilities.java:1091)
> at javax.swing.Timer.post(Timer.java:342)
> at 
> javax.swing.TimerQueue.postExpiredTimers(TimerQueue.java:195)
> at javax.swing.TimerQueue.run(TimerQueue.java:231)
> at java.lang.Thread.run(Thread.java:484)
> 
> Huh !! I do not need X-server !!! I just want to use a pair of Swing
> classes.
> 
> Anybody know what to do ???
> 
> 
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> 

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How to use swing classes without X-server

[Serge A. Redchuk]

Hello All !

I want to use some of Swing classes like

import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;

by tomcat in environment where no X-server running.

And I see in catalina.out:

java.lang.InternalError: Can't connect to X11 window server using ':0.0' as the
value of the DISPLAY variable.
at sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)
at sun.awt.X11GraphicsEnvironment.(X11GraphicsEnvironment.java:5
9)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:120)
at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvi
ronment.java:58)
at sun.awt.motif.MToolkit.(MToolkit.java:57)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:120)
at java.awt.Toolkit$2.run(Toolkit.java:512)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:503)
at java.awt.Toolkit.getEventQueue(Toolkit.java:1150)
at java.awt.EventQueue.invokeLater(EventQueue.java:511)
at javax.swing.SwingUtilities.invokeLater(SwingUtilities.java:1091)
at javax.swing.Timer.post(Timer.java:342)
at javax.swing.TimerQueue.postExpiredTimers(TimerQueue.java:195)
at javax.swing.TimerQueue.run(TimerQueue.java:231)
at java.lang.Thread.run(Thread.java:484)

Huh !! I do not need X-server !!! I just want to use a pair of Swing
classes.

Anybody know what to do ???


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