[Ejtools-developers] [ ejtools-Bugs-633317 ] Needs an X server running

[<no...@so...>]

Bugs item #633317, was opened at 2002-11-04 16:15
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=455072&aid=633317&group_id=49088

Category: JMX Browser (Web App)
Group: 1.0.0-preview
Status: Open
Resolution: None
Priority: 5
Submitted By: Chris O'Byrne (chrisobyrne)
Assigned to: Laurent Etiemble (letiemble)
Summary: Needs an X server running

Initial Comment:
I'm running jboss-3.0.2 on a headless Unix server that
is NOT running X.

I get -

WARNING: Exception for
/jmx-browser/detail.do;jsessionid=xxxxx?reference=xxxxxxxxx
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.<clinit>(X11GraphicsEnvironment.java:54)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:115)
        at
java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:53)
        at
sun.awt.motif.MToolkit.<clinit>(MToolkit.java:52)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:115)
        at java.awt.Toolkit$2.run(Toolkit.java:507)
        at
java.security.AccessController.doPrivileged(Native
Method)
        at
java.awt.Toolkit.getDefaultToolkit(Toolkit.java:498)
        at
java.beans.SimpleBeanInfo.loadImage(SimpleBeanInfo.java:119)
        at
net.sourceforge.ejtools.jmxbrowser.model.ResourceBeanInfo.<init>(ResourceBeanInfo.java:29)
        at java.lang.Class.newInstance0(Native Method)
        at java.lang.Class.newInstance(Class.java:232)
...

It seems that loadImage() needs an X server to be
running...


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>Comment By: Laurent Etiemble (letiemble)
Date: 2002-11-06 22:03

Message:
Logged In: YES 
user_id=437455

It's a common issue in Java. If you access graphic related 
classes or methods which need some native functions, a 
graphical layer is required (a X11 server in this case).
See  
http://developer.java.sun.com/developer/bugParade/bugs/4281
163.html for the description.

Short term workarounds :
- install a X11 server (I guess you won't)
- install the xvbf utility. It simulates a graphical buffer which 
satisfies Java graphical method.

In the JMX browser, there is a shared code base between the 
Web version and the Swing version. In this code, there are 
some BeanInfo classes that load eagerly icons, when the 
classes are loaded.
So a possible work around is to load lazily the icons, only 
when needed (not needed in Web version).

I plan to release a new version of the Web version by the end 
of November that will correct this bug, so I hope you will be 
patient.

Regards.


----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=455072&aid=633317&group_id=49088