Selenium how to call webelements from different test steps

I am writing test codes with Selenium, TestNG, JUnit. I am trying to set some elements on the @BeforeClass section as I am repeating those actions on the same page. But I am getting null pointer exception. Is there a way to fix this issue?

@BeforeClass
public static void driveraBaglan() {
    System.setProperty("webdriver.chrome.driver", "./drivers/chromedriver.exe");
    driver = new ChromeDriver();
    driver.manage().window().maximize();
    //Wait for an object appear on the web site. And also page load time
    driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);
    driver.manage().timeouts().pageLoadTimeout(30, TimeUnit.SECONDS);

    //Visit the web site
    driver.get("http://webmail.likya.net");

    //Set web elements
    user = driver.findElement(By.id("user"));
    pass = driver.findElement(By.id("pass"));
    login = driver.findElement(By.xpath("//button[contains(.,'Log In')]"));
    statusMessage = driver.findElement(By.id("login-status-message")).getText();

}
@Test(priority=1)
//Checks error message on both user name and password left empty
public void loginNoInfo() {
        //Clearing the username and password area in case we use it in another scenario
        user.clear();
        pass.clear();
        //Clicking Log In button and check if error message appears on the page
        login.click();
        Assert.assertEquals(statusMessage, "Oturum açmak için bir kullanıcı adı belirtmelisiniz.", "Kullanıcı adı ve şifre boş kontrolü hatalı");
}

I get the null pointer error on user.clear() , pass.clear() and login.click() functions