Weird InstantiationException problem in IE (MSJVM) - due to caching?

The name of my applet class was MyProjectApplet.class, packaged in a jar (unsigned) called MyProject.jar. My html code was:
<applet code="myPackage.MyProjectApplet.class" archive="MyProject.jar" width="180" height="45">
</applet>
It all worked fine, then recently I needed to make a few changes to the MyProjectApplet code but, when testing it out, I noticed that these changes were not being picked up in IE - IE was still using the old code. (The new code ran fine in Firefox.)
Assuming the problem was down to IE caching the old class files, I cleared the IE cache (Tools -> Options -> Delete Files) - but the problem persisted...
So, to overcome the caching, I decided to rename my class and jar - to MyProjectApplet_New.class and MyProject_New.jar, changing my html code to:
<applet code="myPackage.MyProjectApplet_New.class" archive="MyProject_New.jar" width="180" height="45">
</applet>
And now I get the following message when IE tries to load my applet:
java.lang.InstantiationException: myPackage/MyProjectApplet_New
     at com/ms/applet/BrowserAppletFrame.newInstance
     at com/ms/applet/AppletPanel.processSentEvent
     at com/ms/applet/AppletPanel.processSentEvent
     at com/ms/applet/AppletPanel.run
     at java/lang/Thread.run
And the strangest thing is that if I now use this html:
<applet code="myPackage.MyProjectApplet.class" archive="MyProject_New.jar" width="180" height="45">
</applet>
...that is, specifying the new jar but with the old applet class name (that doesn't even exist in the new jar), then the applet runs! (But it runs the old code, not the new code...)
Does anyone know what is going on? Have I missed something really obvious?
Thanks,
James

At long long long long last, I've found the cause of the problem!...
For some reason, all my classes were being stored in my C:\WINDOWS\Java\lib directory!...
I don't know why, but I've deleted them and things are back up and running.
Happy days!

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I really can't figure out this problem. Search the internet tried all kinds of things, nothing help so far.
I have a Macbook Pro (Lion originally installed) running on Mavericks (all latest updates). SSD installed and the DVD tray is replaced by the original HDD.
The laptop wasn't running very smooth anymore so decided to give it a fresh Mavericks install (even though I know it's not really necessary for mac, it helped, everything is much faster except a weird internet problem came up).
After freshly installing Mavericks I couldn't get into my google account anymore, just wouldn't load. Tried Safari (use this normally) and Firefox and Chrome, this last was gave a SSL connection error, both Safari and FF said the website couldn't be loaded because the server didn't respond. For Gmail I use Mailplane which is just stuck on a white page. I tried repairing the keychain, repaired disk and disk permissions, cleaned browsers, turned off firewall and antivirus (Shopos) started in safe mode, checked time settings which were all good. Nothing of this helped. I even ended up creating a usb bootdisk for Mavericks, formatted the disk and reinstalled from the start just Mavericks and nothing else, started Safari, still the same problem. As even this didn't help I figured it's not worth reinstalling all software so put back my backup.
Now I ended up somehow only being able to use Gmail normally in Firefox, Chrome still gives SSL error and Safari can load the inbox, but I can't open any messages. I get the error there is a problem with the connection. If I try in Basic HTML mode it surprisingly does work.
You would say, just use Firefox, finished...but the thing is that sometimes random websites won't load in Firefox, when I load the same site in Safari it works perfectly.
O yes, I also tried the connect to my iPhone and use the Cellular data network, then it's no problem using Gmail in Safari normally. You would say it's a router problem, but I have another Macbook Pro (just one model later running Mountain Lion) this one works perfectly with every browser. Also my iPhone does everyting logged into the WiFi network.
You can understand I really have no clue what's going on here, I don't see any logic. I can only think of a hardware problem in my Macbook, but don't see how that could cause these problems.
I hope someone is ably to help me ?

Please read this whole message before doing anything.
This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
Step 1
The purpose of this step is to determine whether the problem is localized to your user account.
Enable guest logins* and log in as Guest. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
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After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.
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The purpose of this step is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
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Last edited by pano (2010-06-09 11:43:21)

Hello,
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If s.o. will ever work in this I will be happy to provide any information I can come up with.
Cheers and good night.

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Weird InstantiationException problem in IE (MSJVM) - due to caching?

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