This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
I don't know if anyone understands what you envisage from "NLS support" in a driver. Java used Unicode. The thin driver is a type 4 driver, so is 100% Java. Your database is a Unicode database. I don't know what other support you would need from the driver. Can you explain what support you anticipate needing?