Why cant UIManager get system look and fell (sometimes)

heres what i use:
try{
IManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
catch(Exception exception){}
most of the time this executes fine, but some times the program wont run and i get this error message in a txt file. It starts out like this:
An unexpected exception has been detected in native code outside the VM...
I think this may occur more often when im opening alot of programs at the same time
any help good

I would have thought if it could not find windows look and feel it would go to default l&f not give this error...

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HI ,
I have written a simple swing app which consists of jtextarea in a jscrollpane , and a jbutton, in which the textarea is updated with random text.
I decided to change the theme to native look&feel and so i included the
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It'sn't a system look and feel ..
I tried inserting in a static block before the constructor and tried changing the theme ... but in vain
take a look
http://img228.imageshack.us/my.php?image=javaswingprobaw3.jpg
Pls help

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Why cant UIManager get system look and fell (sometimes)

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