Hello all,
       I post this before, but unfortunately, I did not get any help. I have an com deployment project. It works under WinXP using R2007a. But on Windows 7 am getting many Java errors. I have the latest Java (1.6.0-22) and I modified the jre file to be the latest as recommend by Arindam. But the Java errors persist! There must be an explanation why Matlab Java is not interacting with Windows 7 properly and a simple solution. Those who know great deal of Java and Matlab please help.

Java errors:
-----------------------------------------------------

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at com.mathworks.mlwidgets.html.WebRenderer.scrollToBottom(WebRenderer.java:804)
at com.mathworks.mlwidgets.html.HTMLRenderer.scrollToBottom(HTMLRenderer.java:1383)
at com.mathworks.toolbox.compiler.OutputWindow.display(OutputWindow.java:152)
at com.mathworks.toolbox.compiler.ProjectMgrActions.display(ProjectMgrActions.java:81).....................

01st Method

This will work for , both 32 bits and 64 bits windows 7, follow these  steps.

First you must go to the Matlab icon, right click and go to Properties.

Then click the Compatibility tab and select “Windows 2000” from the drop down in the Compatibility group. Click “OK” and you are done.

02nd Method.

You must change Windows 7 Theme to the classic one (windows classic).now install matlab and it will work properly

To use Matlab with other windows 7 themes you have to change java used by matlab as followings

Download latest java version and install it.

Go to  C:\Program Files\MATLAB\R2007a\sys\java\jre\win32 you will find a file named jer1.5.0_07 rename it to Original_jer1.5.0_07

Go to C:\Program Files\Java you will find file named jet6 (jetX for Xversion) copie it to C:\Program Files\MATLAB\R2007a\sys\java\jre\win32 and rename it to jer1.5.0_07

Now you can use matlab with all themes.Enjoy Matlab 7 in windows 7

Regards,
Dharshana, Efac,University of Ruhuna
Sri Lanka

Hello Dimithu,

    A long while ago you helped me with my java related problem. I need your help again since I am having a similar problem with R2007a and Windows 7. If I use teh original version of Java Matlab does not work I immediately get a Java error. But if I use the recent version  of Java (6-23) then Matlab works under Windows 7. But I cannot compile a m-file to make a dll. As soon as I try to compile I get the following Java errors. This happens even if I run the Matlab as Win XP, Windows 2000 or Windows 7. I am going crazy since this whole thing works under Win XP installation. Could you please help. Thank you.
 
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at com.mathworks.mlwidgets.html.WebRenderer.scrollToBottom(WebRenderer.java:804)
	at com.mathworks.mlwidgets.html.HTMLRenderer.scrollToBottom(HTMLRenderer.java:1383)
	at com.mathworks.toolbox.compiler.OutputWindow.display(OutputWindow.java:152)
	at com.mathworks.toolbox.compiler.ProjectMgrActions.display(ProjectMgrActions.java:81)
	at com.mathworks.toolbox.compiler.ProjectMgrActions$BuildPrjAction.actionPerformed(ProjectMgrActions.java:571)
	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
	at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
	at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
	at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
	at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
	at java.awt.Component.processMouseEvent(Unknown Source)
	at javax.swing.JComponent.processMouseEvent(Unknown Source)
	at com.mathworks.mwswing.MJButton.processMouseEvent(MJButton.java:283)
	at java.awt.Component.processEvent(Unknown Source)
	at java.awt.Container.processEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)
>>  
Dimuthu Dharshana <dimuthummee@gmail.com> wrote in message <1664461435.17574.1290953139605.JavaMail.root@gallium.mathforum.org>...
> 01st Method
> 
> This will work for , both 32 bits and 64 bits windows 7, follow these  steps.
> 
> First you must go to the Matlab icon, right click and go to Properties.
> 
> Then click the Compatibility tab and select &#8220;Windows 2000&#8221; from the drop down in the Compatibility group. Click &#8220;OK&#8221; and you are done.
> 
> 02nd Method.
> 
> You must change Windows 7 Theme to the classic one (windows classic).now install matlab and it will work properly
> 
> To use Matlab with other windows 7 themes you have to change java used by matlab as followings
> 
> Download latest java version and install it.
> 
> Go to  C:\Program Files\MATLAB\R2007a\sys\java\jre\win32 you will find a file named jer1.5.0_07 rename it to Original_jer1.5.0_07
> 
> Go to C:\Program Files\Java you will find file named jet6 (jetX for Xversion) copie it to C:\Program Files\MATLAB\R2007a\sys\java\jre\win32 and rename it to jer1.5.0_07
> 
> Now you can use matlab with all themes.Enjoy Matlab 7 in windows 7
> 
> Regards,
> Dharshana, Efac,University of Ruhuna
> Sri Lanka