Sorry, wrong book. Read both in succession. (Partial) History of Java in finance is covered in Dark Pools by Scott Patterson. Reason was from snowball effect

Sorry, wrong book. Read both in succession. (Partial) History of Java in finance is covered in Dark Pools by Scott Patterson. Reason was from snowball effect starting very small with a lot of altruistic one finance/tech person helping out another in a different firm. I'm not sure I'm going to that justice in a short comment, so simply recommend getting the book.