I am getting following error ORA-00911 when inserting value for CLOB object.

I am getting ORA-00911 error when inserting a value into CLOB object. Does anybody have any idea what the problem or solution is to the below code. Thanks for all the help.
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import java.util.*;

import java.sql.*;

import java.lang.* ;

import java.io.ByteArrayInputStream ;

import oracle.jdbc.driver.*;

import oracle.jdbc.* ;





public class TestClob {



  public TestClob () {

     getConnection() ;

  }



  public void getConnection(){

    java.util.Properties props = new java.util.Properties();

    props.put("user",     "scott");

    props.put("password", "tiger");

    try

    {

      java.sql.Driver d = (java.sql.Driver)Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();

      java.sql.Connection conn = d.connect("jdbc:oracle:thin:@server.com:1521:instance", props);



      PreparedStatement stmt = conn.prepareStatement(

        "insert into TESTCLOB ( col1, clobcol )" +

        " values ( 'hello', ? ); "

      );

      int index = 1 ;

      String xml = new String("Big XML Document") ;

      stmt.setAsciiStream(index++, new ByteArrayInputStream( xml.getBytes() ), xml.length() );

//      stmt.setBinaryStream(index++, new ByteArrayInputStream( xml.getBytes() ), xml.length() );



      stmt.executeUpdate();



      stmt.close();

    }

    catch (SQLException e) {

       System.out.println ( "SQLexception " + e ) ;

    }

    catch ( IllegalAccessException ie ) {

       System.out.println ( "IllegalAccessException " + ie ) ;

    }

    catch (InstantiationException iie) {

       System.out.println ( "InstantiationException " + iie ) ;

    }

    catch (ClassNotFoundException cn) {

       System.out.println ( "ClassNotFoundException " + cn ) ;

    }



    return ;

  } // end of getConnection



  public static void main ( String[] args ) {

     TestClob tc = new TestClob();



  } // end of main



}