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.
If you are serious about load testing I would suggest LoadRunner or Performance Center from HP. Additionally, HP offers Service Test which is a functional testing tool for SOA that creates tests that can be used with LoadRunner to do performance testing. These tools are not cheap, but they are best of breed.