code: public static byte[] invoke(byte[] bytesIn, String... descriptors) {
  		ClassReader cr = new ClassReader(bytesIn);
  		EmptyCtor ca = new EmptyCtor(descriptors);
  		cr.accept(ca, 0);
  		byte[] newbytes = ca.getBytes();
  		return newbytes;
  	}
docs: Empty the constructors with the specified descriptors.
  
  @param bytesIn input class as bytes
  @param descriptors descriptors of interest (e.g. "()V")
  @return modified class as byte array