Oracle doesnt support dirty read

more details at

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import oracle.jdbc.OracleStatement;

public class ConnectionClass {
  public ConnectionClass() {
  }
  public Connection getConnection() throws ClassNotFoundException,
                                           SQLException {
              Class.forName("oracle.jdbc.driver.OracleDriver");
              Connection con = DriverManager.getConnection(
              "jdbc:oracle:thin:@hyc65003fwks.idc.oracle.com:1521:nn11g",
              "scott","tiger");
              con.setAutoCommit(false);
              System.out.println("isolation lvl "+con.getTransactionIsolation());
              con.setTransactionIsolation(Connection.TRANSACTION_READ_UNCOMMITTED);
              return con;
          }

  public static void main(String[] args) throws ClassNotFoundException,
                                                SQLException {
      ConnectionClass obj = new ConnectionClass();
      Connection con1 = obj.getConnection();
      Connection con2 = obj.getConnection();
      obj.doUpdate(con1);
   
      obj.read(con2);
      con1.rollback();
      con1.close();
      System.out.println("again reading.......");
      obj.read(con2);
      con2.close();
  }
  int i=0;
  public void doUpdate(Connection con) throws SQLException {
      Statement stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
   
      i++;
      String sql = "insert into delme values('aa"+i+"')";
      System.out.println("sql >>>"+sql);
      System.out.println(stmt.executeUpdate(sql));
      stmt.close();
  }
  public void read(Connection con) throws SQLException {
      Statement stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
      String sql = "select * from delme";
      System.out.println("sql >>>"+sql);
      ResultSet rs = stmt.executeQuery(sql);
      while(rs.next()) {
          System.out.println(rs.getString(1));
      }
      rs.close();
      stmt.close();
   
  }


}
/* Exception in thread "main" java.sql.SQLException: READ_COMMITTED and SERIALIZABLE are the only valid transaction levels
  at oracle.jdbc.driver.SQLStateMapping.newSQLException(SQLStateMapping.java:70)
  at oracle.jdbc.driver.DatabaseError.newSQLException(DatabaseError.java:110)
  at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:171)
  at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:227)
  at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:439)
  at oracle.jdbc.driver.PhysicalConnection.setTransactionIsolation(PhysicalConnection.java:3988)
  at jdbcproj.ConnectionClass.getConnection(ConnectionClass.java:22)
  at jdbcproj.ConnectionClass.main(ConnectionClass.java:29)
Process exited with exit code 1. */