我收到NullPointerException。 PFA代码。我是初学者，在Selenium中使用TestNG。

有两个软件包。 基本类在package0中，其余的其他类在package1中。

我要做什么？

• 我创建了一个Source类并编写了自动建议框 代码。
  
• 在建议中创建了Source类的对象 类。
  

• 将Source类中的方法调用到 建议类给出了一个NullPointerException错误。
  但是 当我使用TestNG将Source类作为独立类运行时- 工作正常。
  

  package package1;
  
  import java.io.IOException;
  import java.util.List;
  import org.openqa.selenium.*;
  import org.openqa.selenium.support.ui.*;
  
  import package0.Baseclass;
  
  public class Source extends Baseclass{
      public void autoSuggestion() throws Exception
      {
          String autoSuggetionBoxOptionSourceSelection;
          driver.get(getDataFromPropFile("url"));
          WebElement orgin = driver.findElement(By.xpath(getDataFromPropFile("origin")));
          orgin.sendKeys(getDataFromPropFile("originvalue"));
          WebElement autoSuggestionSourceBox= driver.findElement(By.xpath(getDataFromPropFile("autosuggestionsourcebox")));
          WebDriverWait wait = new WebDriverWait(driver,10);
          wait.until(ExpectedConditions.visibilityOfElementLocated(By.xpath(("(//*[@class='suggestion-box__list'])[1]"))));
  
          List<WebElement> autoSuggestionBoxSourceoptions = autoSuggestionSourceBox.findElements(By.tagName("li"));
          //System.out.println("Number of options are:" + autoSuggestionBoxSourceoptions.size());
  
          for (int i=0; i<autoSuggestionBoxSourceoptions.size(); i++)
          {
              autoSuggetionBoxOptionSourceSelection = autoSuggestionBoxSourceoptions.get(i).getText();
              System.out.println(autoSuggetionBoxOptionSourceSelection);
              if (autoSuggetionBoxOptionSourceSelection.contains("LSH"))
              {
                  autoSuggestionBoxSourceoptions.get(i).click();
                  break;
              }
  
          }
  
      }
  }
  
  
  package package1;
  
  import java.io.IOException;
  import java.util.List;
  
  import org.openqa.selenium.By;
  import org.openqa.selenium.WebElement;
  import org.openqa.selenium.support.ui.ExpectedConditions;
  import org.openqa.selenium.support.ui.WebDriverWait;
  import org.testng.annotations.Test;
  
  import package0.Baseclass;
  import package1.Source;
  
  public class Suggestions extends Baseclass {
      @Test
      public void auto() throws Exception
      {
          String autoSuggetionBoxOptionDestinationSelection;
          Source src = new Source();
          src.autoSuggestion();
  
  //      WebElement point = driver.switchTo().activeElement();
  //      
  //      point.sendKeys("LAS");
  //      WebDriverWait wait1 = new WebDriverWait(driver,10);
  //      wait1.until(ExpectedConditions.visibilityOfElementLocated(By.xpath("(//*[@class='suggestion-box__list'])[2]")));
  //      WebElement autoSuggestionDestinationBox= driver.findElement(By.xpath("(//*[@class='suggestion-box__list'])[2]"));
  //      List<WebElement> autoSuggestionBoxDestinationoptions = autoSuggestionDestinationBox.findElements(By.tagName("li"));
  //
  //      for(int i=0;i<autoSuggestionBoxDestinationoptions.size();i++)
  //      {
  //          autoSuggetionBoxOptionDestinationSelection = autoSuggestionBoxDestinationoptions.get(i).getText();
  //          if (autoSuggetionBoxOptionDestinationSelection.contains("VGT"))
  //          {
  //              autoSuggestionBoxDestinationoptions.get(i).click();
  //              break;
  //          }
  //      }
  //
  //      driver.switchTo().activeElement();
  //      String startXP= "(//*[@class='calendar__single-month active'])[1]/div[3]/div[";
  //      int i=1;
  //      String endXP="]/div";
  //      String path= startXP+i+endXP;
  //
  //      for (i =1;i<=42;i++)
  //      {
  //          try {
  //              path = startXP+i+endXP;
  //              String date = driver.findElement(By.xpath(path)).getText();
  //              System.out.println("Date Is:" + date);
  //              
  //              if (date.equals("15"))
  //              {
  //                  driver.findElement(By.xpath(path)).click();
  //                  break;
  //              }
  //          }
  //          catch (Exception e) {
  //
  //              System.out.println("No date present for xpath = " + path);
  //              System.out.println("Exception = " + e);
  //
  //          }
  //      }
      }
  
  }
  
  package package0;
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.util.Properties;
  import org.openqa.selenium.WebDriver;
  import org.openqa.selenium.chrome.ChromeDriver;
  import org.openqa.selenium.firefox.FirefoxDriver;
  import org.openqa.selenium.ie.InternetExplorerDriver;
  import org.testng.annotations.*;
  
  public class Baseclass {
  
  public WebDriver driver;
  public Properties prop = new Properties();
  
  @BeforeMethod
  public void browserSetup()
  {
      String path = System.getProperty("user.dir");
      System.setProperty("webdriver.chrome.driver",path+"\\browserDrivers\\chromedriver.exe");
      //System.setProperty("webdriver.gecko.driver",path+"\\browserDrivers\\geckodriver.exe");
      driver = new ChromeDriver();
      //driver = new FirefoxDriver();
      //driver.manage().window().maximize();
      //System.setProperty("webdriver.ie.driver",path + "\\browserDrivers\\IEDriverServer.exe");
      //driver = new InternetExplorerDriver();
      driver.manage().window().maximize();
  }
  public String getDataFromPropFile(String key) throws IOException
  {
      String projectPath = System.getProperty("user.dir");
      String propFilePath = projectPath+"\\data.properties";
  
      File pathFile = new File(propFilePath);
      FileInputStream fIP= new FileInputStream(pathFile);
      prop.load(fIP);
  
      return prop.getProperty(key);
  }
  
  @AfterMethod
  public void closeBrowser()
  {
      driver.close();
  }
  }