Cannot get any applets to run
Here�s my story
I�ve downloaded the latest JDK (including JRE 1.5_06) and install goes fine. For example I can run java programs I've written locally.
The problem is with my Browsers and the JRE (both IE 6 and Firefox)
I run XP SP2 and am up to date on everything
I thought the problem was with the Microsoft VM (MSJVM) and removed it so that ALL I have is the Sun JRE. I even found a site (at Penn State) that talked about how before installing the JRE
You have to remove a left over registry key so that the Sun package installs correctly. http://www.oit.state.pa.us/oaoit/cwp/view.asp?a=172&q=194113&oaoitNavDLTEST=%7C9138%7C
I did all of that and it appears to work fine.
So now the MSJVM is gone and cannot be reinstalled but I cannot run ANY applet. I�ve checked EVERYTHING I can possibly think of but I�m missing something.
The MSJVM did work before so I don�t think it�s a firewall problem.
Every applet gives me the following types of errors (seen in the java console)
The following happens on the Sun jre verify page at
http://www.java.com/en/download/help/testvm.xml
load: class testvm.class not found.
java.lang.ClassNotFoundException: testvm.class
at sun.applet.AppletClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadCode(Unknown Source)
at sun.applet.AppletPanel.createApplet(Unknown Source)
at sun.plugin.AppletViewer.createApplet(Unknown Source)
at sun.applet.AppletPanel.runLoader(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed.
at sun.applet.AppletClassLoader.getBytes(Unknown Source)
at sun.applet.AppletClassLoader.access$100(Unknown Source)
at sun.applet.AppletClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 10 more
Exception in thread "Thread-4" java.lang.NullPointerException
at sun.plugin.util.GrayBoxPainter.showLoadingError(Unknown Source)
at sun.plugin.AppletViewer.showAppletException(Unknown Source)
at sun.applet.AppletPanel.runLoader(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
java.lang.NullPointerException
at sun.plugin.util.GrayBoxPainter.showLoadingError(Unknown Source)
at sun.plugin.AppletViewer.showAppletStatus(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Exception in thread "thread applet-testvm.class" java.lang.NullPointerException
at sun.plugin.util.GrayBoxPainter.showLoadingError(Unknown Source)
at sun.plugin.AppletViewer.showAppletException(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
This is similar behavior for EVERY applet no matter what site it's located on. I�ve checked cache, paths, registry setting. I can�t think of anything else to try. It's as if every applet cannot access the �jar� files needed from its server.
Behavior is the same from IE or Firefox. I�ve uninstalled and reinstalled many times.
Any help would be greatly appreciated.
Thanks
Marc
If anyone should happen by here with this problem the following is the solution. Even if you have not installed MSN make sure to check this (I did not have MSN installed so there must be other programs that change this)
When MSN Messenger 7.5 installs it changes a registry entry: HKLM\System\CurrentControlSet\Services\TCPIP\Parameters\DatabasePath from REG_EXPAND_SZ to REG_SZ which causes it to fail to expand %SystemRoot%, therefore breaking the path.
Changing the key back to REG_EXPAND_SZ solves the problem on the machine, but to do so you have to delete the entry and re-create it!
If you feel uncomfortable making registry changes I suggest you follow these directions:
1. Open REGEDIT
2. Navigate to HKLM\SYSTEM\CurrentControlSet\Services\TCPIP\Parameters
3. RIGHT click in the right pane and create a New Expandable String Value
4. Name it DataBasePathExpand
5. Right click on DataBasePathExpand and click Modify
6. Enter the value of %systemRoot%\System32\drivers\etc and save
7. Now right click on DataBasePath and delete it
8. Right click on DataBasePathExpand and rename it to DataBasePath
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