Program should work, but not displaying
 

Java programming on linux

I am getting this display problem. The program works on windows and linux but not where I favour to work from.

[sidte5115@node00 w0109699]$ cd Bank
[sidte5115@node00 Bank]$ appletviewer NorthfieldBanque.java
Xlib: connection to "whale.cscs.qmw.ac.uk:49.0" refused by server
Xlib: Client is not authorized to connect to Server
Exception in thread "main" java.lang.InternalError: Can't connect to
X11
window
server using 'whale.cscs.qmw.ac.uk:49.0' as the value of the DISPLAY
variable
.
at sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)
at
sun.awt.X11GraphicsEnvironment.<clinit>(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 java.awt.Window.<init>(Window.java:188)
at java.awt.Frame.<init>(Frame.java:315)
at java.awt.Frame.<init>(Frame.java:262)
at sun.applet.AppletViewer.<init>(AppletViewer.java:139)
at
sun.applet.StdAppletViewerFactory.createAppletViewer(AppletViewer.jav
a:81)
at sun.applet.AppletViewer.parse(AppletViewer.java:1035)
at sun.applet.AppletViewer.parse(AppletViewer.java:969)
at sun.applet.Main.run(Main.java:140)
at sun.applet.Main.main(Main.java:82)
[sidte5115@node00 BankCW1]$


I have tried

man xhost


I have read this very small manual but it doesn't help.

I have tried 4 different servers: whale, cetacean, porpoise and
dolphin. All gave the same error.

The last server I tried via dolphine, it works on this but the laboratory is favoured by first year undergradutes.

Try typing 'xhost +' before executing the appletviewer.

Thank you
This works