The createTemporary() method of oracle.sql.CLOB allocates resources 
which should be cleaned up with a call to freeTemporary() once the 
PreparedStatement has been executed. As the StringClobType class 
stands at the moment it doesn't cleanup the temporary clob and will 
slowly leak memory resources.

I'm just evaluating Hibernate at the moment and so don't know if there 
is an appropriate hook that can be used to ensure that freeTemporary() 
gets called post statement execution.