Null Pointer Exception

hai, i am getting null pointer exception in second test menthod checkHomePageLeftBoxLinks(). i have define all the login details and navigate url in doDefaultLogin() function and i define this doDefaultLogin() function in TestBase.java. if i put checkHomePageLeftBoxLinks() code in login() then its working but if i used it in checkHomePageLeftBoxLinks() then its throwing null pointer exception.

i have understood that driver getting null but how i define driver here with my url.
Please suggest


@Test
public void login(){
doDefaultLogin("Mozilla");
APPLICATION_LOG.debug("Login Successfull");
//WebElement leftBox = driver.findElement(By.xpath("//*[@id='divList']"));
//List<WebElement> productLink = leftBox.findElements(By.xpath("//div[@class='listRecent roundCornersSmallLeft']"));
//System.out.println("Total Link -"+productLink.size());
}

@Test
public void checkHomePageLeftBoxLinks() throws InterruptedException{

WebElement leftBox = driver.findElement(By.xpath("//*[@id='divList']"));
List<WebElement> productLink = leftBox.findElements(By.xpath("//div[@class='listRecent roundCornersSmallLeft']"));
System.out.println("Total Link -"+productLink.size());

}