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.
As I recall, Java 1.3.1 supports only JDBC 2.0 which doesn't provide a mechanism for creating a clob, only reading them. Unfortunately you will have to use oracle.sql.CLOB.getCharacterOutputStream() to get a writer that will allow you to write to your clob. Java 1.4 includes JDBC 3.0 which does provide Clob.setCharacterStream().