String driver = this.getInitParameter(INIT_PARAM_JDBC_DRIVER);
String url = this.getInitParameter(INIT_PARAM_JDBC_URL);
String username = this.getInitParameter(INIT_PARAM_JDBC_USERNAME);
String password = this.getInitParameter(INIT_PARAM_JDBC_PASSWORD);
return new JdbcDao(username, password, driver, url);
}