Bug in JVM

I was trying to call Unsafe.defineClass() method of the class Unsafe but it always returns null

the line code is

defineClass(name, arr, 0, arr.length) ;

I opened the jvm.dll in hexeditor and found that there is no entry for this method in jvm.dll also.

is this an error or I should use a different method.

Please help me ...

thanks

[375 byte] By [rahulapva] at [2007-11-27 3:41:38]