try {
  java.sql.Clob clob = oracle.sql.CLOB.createTemporary(
connection, false, oracle.sql.CLOB.DURATION_SESSION);
  clob.setString(1, xml); // Sent xml un String
     String sql = "insert into taula (text) values (?)";
  PreparedStatement stmt = con.prepareStatement(sql);
  stmt.setClob(1, clob);
  stmt.execute();
} finally {
  clob.free();
}‪