code: @SuppressWarnings("unused")
      private void saveClassfileBufferForDebugging(String className, byte[] classfileBuffer) {
          try {
              if (className.contains("CX")) {
                  java.io.DataOutputStream tmpout = new java.io.DataOutputStream(new java.io.FileOutputStream("out"));
                  tmpout.write(classfileBuffer, 0, classfileBuffer.length);
                  tmpout.close();
              }
          } catch (Exception ex) {
              ex.printStackTrace();
          }
      }
docs: This method is for debugging purposes. So far one of the best way to
  debug instrumentation was to actually look at the instrumented code. This
  method let us choose which class to print.
  
  @param className
  Name of the class being instrumented.
  @param classfileBuffer
  Byte array with the instrumented class content.