New to Java

i am working on the enchancement of the existing code.
now we have to support utf16 format xml .So i found that parser is successfully parsing the xml but at the time of storing into the database(oracle9i), it is throwing "string index out of range:-8" exception.we are using store procedure for insert statement.
If it is database issue then also our client asked to convert data in java classes to support used Oracle9i.
Since i am new to java and i m not able find solution.
Can anybody help?

Thanks in advance,
Shub