ion domain of the 
        class being defined or redefined</dd>
<dd><code>classfileBuffer</code> - the input byte buffer in class 
        file format - must not be modified</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a well-formed class file buffer (the result of 
         the transform), or null if no transform is performed</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.instrument/java/lang/instrument/Illeg