JSF, TopLink and NVarchar

Question

I'm using JSF with Toplink for our website. One of our tables has NVarchar2 column which supports UTF16 as national character set.
Previous in JDBC we were setting statement.setFormOfUse(1, Const.NCHAR) to force updating or inserting this column as NChar.
How can I do that here, since I don't have a connection or control over these statements.
i.e. How can I force insertion for NVarchar in toplink.
Thanks.

Answer 1

Thank you Doug for your information. I tried to see some examples but I could figure out how to implement it in my code. I'm new in that technology.
the example:
// Create TypeConversionConverter instance
TypeConversionConverter typeConversionConverter = new TypeConversionConverter();
typeConversionConverter.setDataClass();
typeConversionConverter.setObjectClass();
// Set TypeConversionConverter on ArrayMapping
ArrayMapping arrayMapping = new ArrayMapping();
arrayMapping.setValueConverter(typeConversionConverter);
arrayMapping.setAttributeName("responsibilities");
arrayMapping.setStructureName("Responsibilities_t");
arrayMapping.setFieldName("RESPONSIBILITIES");
orDescriptor.addMapping(arrayMapping);
My Table is: Brand, and the NVarchar2 Field is : Unicode_Name.
Can you help me out please.
Also what is orDescriptor ? from where can I get it. the only descriptor I know in my project is faces-config.xml.
Thank you for your help in advance.