Java Applications - Frequently Asked Questions
Installation and Troubleshooting
Why do I need administrator privileges to install Java Web Start on Windows?
Java Web Start needs to register the MIME type of its launch file with the system registry.
MIME types are mappings used to find the correct application to handle particular file types.
MIME stands for "Multipurpose Internet Mail Extensions." It is a standard across the
internet.
Java Web Start's MIME entry identifies it as the application to launch to handle Java Web
Start applications like the application you have downloaded. The MIME type applies whenever you try to
open or browse to a file with the ".jnlp" extension which identifies itself as an
"application/x-java-jnlp-file."
What is the "Security Warning" that comes up the first time I run the application?
There are several features of each application which require
access to your system and network. To print, the application
needs access to your local printer. To save and reload preferences,
the application needs access to your local disk drive. To get
its data, the application needs to make an outgoing
connection across your network to our data server. These are the kinds
of things applications do all of the time without warning you.
To ensure that you are downloading the desired application, and not
a malicious application, the executable files are signed to
authenticate them. The warning is Java Web Start's way of telling
you that you are downloading an application that requires access to
your system, and asking you to verify the application is coming from
where you expect it.
Why can't I run the application on my older Mac?
Apple does not provide Java 1.6 for any of its computers except Intel-based processors running
Mac OS X 10.5 (Leopard). The latest details can be found on Apple's Java web page. Hopefully,
they will provide a stable Java 1.6 in the future. For the time being, however, their official
response to our queries is:
Please know that Apple has made no further announcements regarding the availability of Java.
For the desperate, there is an X11-based version of Java 1.6 available for Mac OS X 10.4 (Tiger).
It can be downloaded from the SoyLatte
Project web site. Of course, we cannot endorse any 3rd-party software. Use at your own risk.
Why does Java Web Start say the jar file is corrupted?
Some web filtering products used on Microsoft Windows, such as NetNanny and certain firewall programs,
corrupt the digital signatures on downloaded application files. This makes the downloaded files
appear to have been tampered with. For security reasons, Java Web Start then refuses to run the
downloaded application. The only solution is to turn off the offending software, clear your Java
Web Start cache, and re-launch the application.
Why can't I start the application in my browser?
Besides various flavors of Linux, the application offered on the ADDS web site
have only been tested on Windows XP running Internet Explorer 6.0.
We cannot guarantee the application will start on all combinations
of OSs and browsers, and, because of our security policy, we are not
allowed to run many of the combinations our users have installed (for example, Win98).
However, it is not necessary to use a browser to run the application offered on the ADDS web site!
A browser is used only to locate the application, and to kick
off Java Web Start. To run the application without a browser,
download and install
Java Web Start,
then, launch Java Web Start with the following URL on the command line: http://weather.aero/jade/fpt.jnlp
What kind of hardware is required to run this tool?
Generally, we suggest a minimum of 500 MHz processor and 500 MB RAM along with 1024x768 monitor setting.
If using a 28.8 or 56K modem internet connection, then expect the application (11.6 MB) to take up to
40 minutes to download the first time. Once downloaded, it does not get downloaded again (until a new
version is available). The response time of the application (accessing data) will vary according to
your internet connection as well.
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