Problem in running a class inside java_home/jre/lib/ext

I have a class file.
I compiled the class and packaged it to a jar file .
Then i place the jar file at java-home/jre/lib/ext
Now when i try to run this file it shows a NoClassDefFoundError
Do i need to set the path in some .properties files.???
please help me out....

i think its to do with setting the
java.ext.dirs path
if i compile it with like
java -Djava.ext.dirs=D:\jdk\jre\lib\ext Testthen it works and shows the Classloader as "ExtClassLoader"
But this is a run time setting.
How can i set this property "java.ext.dirs" permanently.

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Problem in running a class inside java_home/jre/lib/ext

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