Re: Turning off JIT Optimisation

In a secure program I want to be able to wipe the byte array
containing the key, mKey[], before releasing the memory back to the
system. To do that I wrote a simple dispose() method to do a
reasonably secure overwrite of the array:

     public void dispose() {
       if (mKey != null) {
         for (int i = 0; i< mKey.length; ++i) {
           for (int j = 0; j< 5; ++j) {
             mKey[i] = (byte)0x55;
             mKey[i] = (byte)0xFF;
             mKey[i] = (byte)0xAA;
             mKey[i] = (byte)0x00;
           } // end for
         } // end for
         mKey = null;
       } // end if
     } // end dispose()

Obviously any reasonably good JIT compiler can look at that and
optimise it to the equivalent of:

     public void dispose() {
       if (mKey != null) {
         mKey = null;
       } // end if
     } // end dispose()

That is not what I want, since the repeated overwrites make it more
difficult for an attacker to recover the former contents of memory.
Is there some way to tell the JIT compiler that I do not want this
method to be optimised but to be run as written? Effectively an
@Pessimise annotation for just this method.