Just to let people know that in ESB 4.2.1, the setByteArray/getByteArray approach in Body will be deprecated. If you want to add bytes to your Body you can continue to do so through the add method. If you want to make sure that clients and services agree on where in the Body a byte array should go, there's a reserved property name too (so you can continue to add your message contents and byte arrays without risking overwriting anything). Check out the examples and docs for more details when this happens.
