Unable to insert XML in CLOB (for Long Lived Processes)

I am trying to insert XML/XDP in a CLOB column of an Oracle Database. It seems to work in a short lived process. However, I get all sorts of errors when I convert it to long lived.

Anyway one know why?

I extract the XML/XDP using a process form submission module and convert it to string. Then, I run the insert through a custom script as setString.

Aditya