ORA-01002: fetch out of sequence when trying to insert CLOB data into Oracle

Dear all,
Can any one help me on this regard?
My code:

try{
 Connection connection;
      DriverManager.registerDriver(new oracle.jdbc.OracleDriver());
      connection = DriverManager.getConnection(DBURL, DBUSER, DBPWD);
//Empty insert into DB
Statement st = connection.createStatement();
String query = "insert into clob_master (fileid, fileobj) values ( '11.0', 'empty_clob()')";
st.executeUpdate(query);
st.close();
//Get the record that has been inserted just now.
Statement s2 = connection.createStatement();
ResultSet rs = s2.executeQuery("select fileid, fileobj from clob_master where fileid = '11.0' for update");
CLOB clobObj = null;
if(rs.next())
{
clobObj = ((OracleResultSet)rs).getCLOB(2);
Writer clobWriter = clobObj.getCharacterOutputStream();

File f = new File("clob.txt"); 
FileReader reader = new FileReader(f);

int i = 0;
while ((i= reader.read()) != -1) // Read from File
clobWriter.write(i); // Write to CLOB

reader.close();
clobWriter.close();
}
rs.close();
s2.close();

//Statement su = connection.createStatement();
//su.executeUpdate("update clob_master set fileobj  = " + clobObj + "where fileid = '10.0'");

//su.close();
                //Uncommenting the above 3 lines also would not help!!!
connection.close();          
    
    } catch (Exception e) {
            e.printStackTrace();
        }
    }

My exception is :

Line 27 is the executeQuery of the select statement above.
Am I missing something here...?
Thanks for your help...