运行Selenium测试脚本时获取NullPointeException

Question

import org.openqa.selenium.WebElement;
import org.openqa.selenium.support.FindBy;
import org.openqa.selenium.support.PageFactory;
import com.actitime.genericlib.WebDriverCommonLib;

public class LakesAndMountainsHomePage extends WebDriverCommonLib{

WebDriver driver;

public LakesAndMountainsHomePage(WebDriver driver)
{
this.driver = driver;
PageFactory.initElements(driver, this);
}


@FindBy(xpath= "//*[@id='the-main-menu']//*[contains(text() , 'LAKES & 
MOUNTAINS')]")
WebElement LandM;

public WebElement LandMHeader()
{
System.out.println("came inside the method");
//LandM.isDisplayed();
return LandM;
}

}

public abstract class BaseTest {

    ExcelLib eLib;
    WebDriverCommonLib wLib;
    WebDriver driver;
    HomePage homepage;

  @BeforeClass
  public void baseBeforeClass() 
  {
    eLib = new ExcelLib();
    wLib = new WebDriverCommonLib();
    driver=Driver.getBrowser();
    driver.manage().window().maximize();
    System.out.println("Browser is launched");
  }

  @BeforeMethod
  public void launchURL()
  {  
      wLib.homePage();
      //loginPage.loginToAPP();
      System.out.println("Navigated to the URL");
  }      
}

public class LakesAndMountainsHomePageTest extends BaseTest{

LakesAndMountainsHomePage lm = new LakesAndMountainsHomePage(this.driver);

 //TC TC131409 [New Lakes & Mountains Tab] : Verify New Lakes & Mountains 
Tab is displayed in header. 
 @Test(priority=0)
  public void lakesAndMountainsHeader()
  {
boolean a= lm.LandMHeader().isDisplayed(); //getting exception here
if(a==true)
{
System.out.println("Lakes And Mountains tab is present in the HomePage");
}
else
{
System.out.println("Lakes And Mountains tab is not present in the 
HomePage");
}
      lm.LandMHeader().click(); 
      System.out.println("It has clicked the tab");
  }
}

java.lang.NullPointerException（位于org.openqa.selenium.support.pageFactor.defaultelementLocator.java:69)（位于org.openqa.selenium.support.pageFactor.internal.locatingelementandler.invoke(locatingelementandler.java:38)（位于com.sun.proxy.$proxy9.isdisplay（未知源）（位于com.acttime.usertest.lakesandmountainshomePagetest.lakesandmountainsheader（位于eTestMethods(testMethodWorker.java:125)在org.testng.internal.testMethodWorker.run（testMethodWorker.java:109)在org.testng.testRunner.privaterun（testRunner.java:776)在org.testng.testRunner.run（testRunner.java:634)在org.testng.suiterunner.runtest（testRunner.java:425)在org.testng.suiterunner.runsequency（

在执行下面的testng测试脚本之后，我将获得NullPointerException。当URL进入测试脚本方法时启动URL后，它将抛出异常。你能帮我一下吗。

Answer 1

LakesAndMountainsHomePage lm = new LakesAndMountainsHomePage(this.driver);