you should uninstall and then re-install your Java Runtime Environment(JRE) and Java Web Start making sure that the user account you do this with has administrative permissions.
Note: This test doesn't work on Netscape
6+/Mozilla, and derivatives. They will always tell you that you do not
have it installed, even if you do. To find out for sure (some other
strange browser/OS combinations might throw us off also), go to the Java Web
Start demos webpage and try one out.
The following sections will help you to install Java Webstart or fix
problems that you may be having with it.
Note: If you are on Windows NT or a derivative, you will need to
install Web Start in a directory that users have permission to write
to. Web Start writes cache information to a common directory.
Note: If, for some reason, you don't have a default browser set you might have problems running the Web Start application manager. It might pop up a splash screen and then disappear without actually running the application manager. Set a browser and you should be OK.
We have had some cases of difficulties with the version
of Web Start included in Java 1.4.2 on Linux. URLs in the Control Panel
wouldn't work correctly, and the Web Start manager (javaws) wouldn't
start properly. If you have problems with this, we recommend the
following: Get rid of the .javaws and the .java
directories in your home directory. You can rename them to something
else if you wish, but javaws doesn't seem to handle their existence in
all cases.
Java Webstart 1.4.2 might not properly detect your browser. If this happens, go into the Web Start manager and set it manually from the File > Preferences menu option.
If you are using a version of Java other than Sun, you
might find yourself installing only Web Start.
If you can't seem to run Web Start
correctly as a normal user, check the permissions of javawsbin.
root, only root
will be able to use it.Note: for those using
Mozilla on Unix type
platforms: Early versions of Mozilla didn't pick up the .mailcap and
.mime.types file changes that the install process performed when Web
Start installs. You might need to manually add it by going to Edit >
Preferences > Navigator > Helper Apps and adding a New Type with
information:
Description of Type: |
Java Web Start |
File Extension: |
jnlp |
MIME type: |
application/x-java-jnlp-file |
Application To Use: |
/path/to/javaws |
(You can get the /path/to/javaws by looking in
your .mailcap file in your home directory. The install process should
have put it there)