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Java Control Panel does not open - Applets not displayed correctly

Posted on 2008-10-26
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Last Modified: 2013-12-08
Hi Guys,

For some strange reason (I can remember version 5.0 of the JRE, bundled with my PC used to work) all new Java updates do not work properly on my PC.

They all install correctly but then the following happens;

Java Control Panel (from Control Panel) does not open. You double-click on it and nothing happens.

Java applets do not run properly; When you open a web page with a Java applet, you can see the Java loading animation, then nothing happens....Just a white rectangle where the applet should be. The Java icon is also visible in the taskbar, but when you right-click on it to e.g. Show Console, nothing happens.

If you open cmd and type java, you get the correct info.

I have tried a webpage recommended on another article in experts exchange that shows an applet displaying your JRE information, and it works (ie. displays everything).

The applets behave in the same way in IE, Safari and Chrome - As a last resort I tried unchecking Sun JRE 6 from IE Advanced Options, then all applets were displayed with the icon you get when a picture or other object is not available. Re-enabling it and restarting IE however did not do the trick - now its as if there is no JRE installed. I have un-installed and re-installed the JRE a zillion times but nothing...

Any ideas pls, as I am about to start hitting my head on the wall...

Thanks
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Question by:jsyrakis
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LVL 27

Expert Comment

by:rrz
ID: 22807566
If you are on windows, then  in start menu click on Control Panel,  and click on Java icon there. That should give you access to Java Control Panel.  
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Author Comment

by:jsyrakis
ID: 22807672
Thanks for the reply, but as I said double-clicking on the Java icon (or running javacpl.exe from the JRE directory) does not do anything...
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LVL 27

Expert Comment

by:rrz
ID: 22808077
Maybe your registry is not set up properly.  
Run regedit.  Go to  HKEY_LOCAL_MACHINE | SOFTWARE | JavaSoft | Java Plug-in
I am not a Windows expert. I would not change anything there without finding an expert at
http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Windows/ 
or a subzone for your version.
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Accepted Solution

by:
jsyrakis earned 0 total points
ID: 22835561
FINALLY after much hair-pulling I found the solution to the problem (and an extemely unlikely solution at that)...

Downloaded the ClearType Powertoy from Microsoft and ran it. Disabled Cleartype. Problem solved!

Now the Java Control Panel opens normally, applets run normally. Re-enabling Cleartype breaks everything again.

This is happening on a Dell Precision 390, with three monitors - Two on an NVIDIA Quadro 550 and the third on an NVIDIA FX 5200. Latest drivers installed.

If anyone has any ideas why this is happening / or solutions, please...

Otherwise, I will ask for points to be refunded and question to be closed.

Thanks
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LVL 27

Expert Comment

by:rrz
ID: 22835713
Good work.  Just accept your last comment as the solution.
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