I just tried out the webstart version of jext at http://www.jext.org/ with 6.0:
The first time I started the app webstart started downloading the required files. Midway through it stalled. The estimated completion time increased second for second. And from time to time webstart displayed that the download had stalled. I waited for about half a minute. Webstart made no attempt to restart the download or otherwise handle the situation.
This is a good example of lack of what I like to call "defensive coding". In the consumer space our code needs to be resilient enough to handle problems that may come out way. Do you have an idea of what might have caused this?