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

public class DerbyTest {
    private Connection connect = null;
    private Statement statement = null;
    private ResultSet resultSet = null;

    public DerbyTest() throws Exception {
        try {

            Class.forName("org.apache.derby.jdbc.ClientDriver").newInstance();
            connect = DriverManager.getConnection("jdbc:derby://localhost:`1527/vineet");
            statement=connect.createStatement();
                        resultSet = statement.executeQuery("SELECT * FROM EMPLOYEE");
            while (resultSet.next()) {
                String user = resultSet.getString("name");
                String number = resultSet.getString("number");
                System.out.println("User: " + user);
                System.out.println("ID: " + number);
            }
        } catch (Exception e) {
            throw e;
        } finally {
            close();
        }

    }

    private void close() {
        try {
            if (resultSet != null) {
                resultSet.close();
            }
            if (statement != null) {
                statement.close();
            }
            if (connect != null) {
                connect.close();
            }
        } catch (Exception e) {

        }
    }

    public static void main(String[] args) throws Exception {
        DerbyTest dao = new DerbyTest();
    }

}

when the above code snippet is executed the is no class found exception.how can i connect to derby embeddeddriver? because when i create a database in netbeans the it automatically get connected to derby networkdriver or clientdriver as in the above code snippet ,so please help me out.

Add derby.jar to your project's library list. And that is as much as I will say about it as classpath discussions always become ugly on a forum. Find a tutor and/or read the IDE documentation thoroughly and read everything you can find about classpath.

i have added derby.jar in the folder list but still class not found exception.

Not folder list. See your project's properties/preferences and search for the library list.