<t>I've read somewhere that Java 7 and UP have some issues with the ClassNotFoundException error.<br/>
Apparently, uninstalling Java and installing Java 6 can solve the problem.<br/>
<br/>
However, I cannot ask everyone who will come to my website to uninstal Java 7 or 8 and replace it with Java 6 ...

I asked the website developpers.
They said that File Management was not implemented yet.
And they do not know when it will be, if it will be.

<r>In case you need the codes, here they are :<br/>

<CODE><s>[code]</s><!--
SweetHome3DViewer.html 31 Mar 2009

Sweet Home 3D, Copyright (c) 2009-2013 Emmanuel PUYBARET / eTeks <[email protected]>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU ...

<t>I forgot to mention what I actually did.<br/>
<br/>
Since I don't have any certificates, I tried removing the JNLP.<br/>
I removed the JNLP folder in the JAR and I removed every references to the JNLP file from the MANIFEST file inside the META-INF folder.<br/>
<br/>
After this, I repacked the ...

Alright, I tried what you suggested.
I get a ClassNotFoundException error.
It says the class com.eteks.sweethome3d.applet.SweetHome3DViewer cannot be found.
This is strange as it is in fact inside the JAR file...

I've tried to modify the SweetHome3DViewer.jar and changing the JNLP file inside it.
Now I get a NullPointerException.

I've tried to see where this error could come from.
Apparently, just modifying a tiny bit the jnlp file then converting it generates this error.
That is quite bothering if I cannot modify this file...
I have no idea of how the Java signatures work.

<t>Alright, I managed to code it right.<br/>
Apparantly, it needed to be encoded with a certain character encryption.<br/>
<br/>
Anyway, now I have another problem.<br/>
The app loads correctly. But after loading, it stays blank or I get a JNLP Signing Exception error.<br/>
It reads "Cannot validate ...

<r>Thank you for your reply.<br/>
<br/>
I tried what you suggested. However, now, the app doesn't even show up on the website.<br/>
<br/>
I got the following code from the BASE64 encryption :
<CODE><s>[code]</s>PD94bWwgdmVyc2lvbj0iMS4wIj8+Cg0KPCEtLQogICANClN3ZWV0SG9tZTNEVmlld2VyLmpubHAN ...

<r>Hi,<br/>
<br/>
I'm using an online web creation service which allows me to upload files to my website but does not allow me to insert the files into folders.<br/>
<br/>
Therefore, all my files for Sweet Home 3D Viewer are in the following URL : <URL url="http://www.mywebsite.com/files/theme/">www ...