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Easy Learn Java: Programming Articles, Examples and Tips - Page 114


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How can I completely clean up my Windows XP from Microsoft JVM before I install

Go to all tips in General Java

Question: How can I completely clean up my Windows XP from Microsoft JVM before I install Sun Microsystems JVM?

Answer: You might want to remove the Microsoft JVM, which Microsoft no longer supports, in favor of the more recent Sun Microsystems JVM. To remove the Microsoft JVM, perform the following steps:

1. From the Start menu, select Run.
2. Enter the command
RunDll32 advpack.dll,LaunchINFSection java.inf,UnInstall
to start the uninstall process
3. Click Yes to the confirmation, then select Reboot.
4. After the machine restarts, delete the following items:
the %systemroot%java folder
java.pnf from the %systemroot%inf folder
jview.exe and wjview.exe from the %systemroot%system32 folder
The HKEY_LOCAL_MACHINESOFTWAREMicrosoftJava VM registry subkey
The HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet
ExplorerAdvancedOptionsJAVA_VM registry subkey (to remove the Microsoft
Internet Explorer (IE) options)

Now you can get latest JVM from Sun!
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2 comments | Printer Friendly Page  Send to a Friend | Score: 5
Posted by jalex on Thursday, December 11, 2003 (00:00:00) (4229 reads)

On some Windows 2000 machines our application (uses Java 2D) causes system crash

Go to all tips in Graphics

Question: On some Windows 2000 machines our application (uses Java 2D) causes system crash - blue screen of Windows death Smile...

Answer: It can happen if you J2SE 1.4.1 and later. The problem is not in Java itself but rather in obsolete video drivers that can contain bugs. Java 2D functionality in J2SE 1.4.1 and beyond is implemented using DirectDraw and Direct3D for various off screen rendering functions.
Possible solution is to update video driver. Find out what is chipset your graphical card uses and then go to the site of manufacturer, for example http://www.atitech.com

If it does not help you can run your application with different flags.

One example of a known problem is that using Direct3D on some small subset of Windows 2000 systems has been known to cause a system crash. You can also try launching your application with the following command-line flag set:

-Dsun.java2d.d3d=false

This forcibly disables our use of Direct3D and avoids any Direct3D-specific problems.
You can also try the following flag:

-Dsun.java2d.ddoffscreen=false

This flag disables our use of DirectDraw and Direct3D for off screen images (such as the Swing back buffer).
If a problem persists, try launching the application with this flag:

-Dsun.java2d.noddraw=true

This flag disables our use of DirectDraw and Direct3D completely and thus avoids any problems you may be seeing associated with our use of those APIs and their respective drivers on your system.

This tip is based on release notes for J2SE 1.4.2:

http://java.sun.com/j2se/1.4.2/relnotes.html#vm


22 comments | Printer Friendly Page  Send to a Friend | Score: 0

Posted by jalex on Wednesday, December 10, 2003 (00:00:00) (3832 reads)

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