This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
Two debugging tips that will greatly narrow down your question:
1) Which is failing stmt or stmt1?
2) What is the literal String that you are passing in (after all the concatenation is done), does it work at command line Oracle?