I get the same thing on Red Hat Enterprise Linux 5.3, Firefox 3.0.3, Java Plug-in 1.6.0_14. There's no proxy in my case.
I tried the URL http://www.xmlmind.com/xmleditor/_applet/xxe.jnlp and that started a web start process (though it didn't sucessfully start an editor). http://www.xmlmind.com/xmleditor/_applet/xxe.jar results in a 404. Bng Hussein Shafie wrote: > Yves Forkl wrote: > >> Neither of the two XXE 4.4 applet demos available at >> http://www.xmlmind.com/xmleditor/xxe_applet.html works for me. I always >> end up with an almost empty framed area just saying "Error. Click for >> more information" (translated from German). >> >> Clicking inside the area opens the Java console which shows "Class >> com.xmlmind.xmleditapp.applet.Applet not found" (again translated from >> German) and >> java.lang.ClassNotFoundException: com.xmlmind.xmleditapp.applet.Applet . >> > > This means that ``something'' prevents you from downloading: > > http://www.xmlmind.com/xmleditor/_applet/xxe.jnlp > > and/or > > http://www.xmlmind.com/xmleditor/_applet/xxe.jar > > > > >> My system has: >> >> Ubuntu 8.04 >> Firefox 3.0.10 with Java(TM) Plug-in 1.6.0_13-b03 >> (and a firewall with a proxy...) >> >> So the system requirements you state should be met. However, I am not >> sure how to fulfil the requirement "The applet must be signed using a >> digital certificate." >> > > We have already signed the applet code found in > http://www.xmlmind.com/xmleditor/_applet/*.jar using a digital > certificate. You have nothing to do in that respect. > > > >> How can I get the applet demos to run? >> > > I'm sorry but we cannot reproduce this problem with any of our machines > (found at our offices or at the homes of any of our employees). Also > note we have tested the applet demo on several Linux boxes. > > * Please make sure that Java is enabled in your browser > (Edit|Preferences, Content section). > * If you can, please retry without the proxy. > > > > -- > XMLmind XML Editor Support List > xmleditor-support at xmlmind.com > http://www.xmlmind.com/mailman/listinfo/xmleditor-support >

