通过Selenium运行测试用例时的java.lang.NullPointerException
通过Selenium运行测试用例时的java.lang.NullPointerException
提问于 2016-07-21 15:06:17
我正面临着NullPointerException的问题。我尽了最大的努力，但我无法解决这个问题。我正在为我的项目实现一个POM模型(Selenium)。
页面：
public class VendorsHomePageApp
{
WebDriver driver;
public VendorsHomePageApp(WebDriver driver)
{
this.driver=driver;
}
@FindBy(how=How.XPATH,using=".//*[@id='navbarCollapse']/ul[1]/li[1]/a")
WebElement dashboardTab;
@FindBy(how=How.XPATH,using=".//*[@id='navbarCollapse']/ul[1]/li[2]/a")
WebElement tendersTab;
@FindBy(how=How.XPATH,using=".//*[@id='navbarCollapse']/ul[1]/li[3]/a")
WebElement notificationsTab;
@FindBy(how=How.XPATH,using=".//*[@id='navbarCollapse']/ul[1]/li[4]/a")
WebElement profileTab;
@FindBy(how=How.XPATH,using=".//*[@id='navbarCollapse']/ul[2]/li/a")
WebElement vendorName;
@FindBy(how=How.XPATH,using=".//*[@id='navbarCollapse']/ul[2]/li/ul/li[1]/a")
WebElement vendorHelp;
@FindBy(how=How.XPATH,using=".//*[@id='navbarCollapse']/ul[2]/li/ul/li[3]/a")
WebElement vendorSignOut;
@FindBy(how=How.XPATH,using="html/body/section/div/div/div/div[2]/div/table/tbody/tr[1]/td[1]/a")
WebElement firstTender;
@FindBy(how=How.XPATH,using="html/body/section/div/div/div/div[2]/div/table/tbody/tr[2]/td[1]/a")
WebElement secondTender;
@FindBy(how=How.XPATH,using="html/body/section/div/div/div/div[2]/div/table/tbody/tr[3]/td[1]/a")
WebElement thirdTender;
public void clickOnDashboardTab()
{
dashboardTab.click();
}
public void clickOnTendersTab()
{
tendersTab.click();
}
public void clickOnNotificationsTab()
{
notificationsTab.click();
}
public void clickOnProfileTab()
{
profileTab.click();
}
public void clickOnFirstTender()
{
firstTender.click();
}
}TestClass：
public class VendorsHomePageTest
{
public WebDriver driver;
@Test
public void verifyVendorsHomePageTest() throws Exception
{
LoginIntoVendors login=PageFactory.initElements(driver, LoginIntoVendors.class);
login.verifyLoginVendors();
VendorsHomePageApp vhpapp= PageFactory.initElements(driver, VendorsHomePageApp.class);
//driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
Thread.sleep(3000);
vhpapp.clickOnNotificationsTab();
vhpapp.clickOnProfileTab();
vhpapp.clickOnTendersTab();
vhpapp.clickOnDashboardTab();
vhpapp.clickOnFirstTender();
}
}错误日志：
FAILED: verifyVendorsHomePageTest
java.lang.NullPointerException
at org.openqa.selenium.support.pagefactory.DefaultElementLocator.findElement(DefaultElementLocator.java:69)
at org.openqa.selenium.support.pagefactory.internal.LocatingElementHandler.invoke(LocatingElementHandler.java:38)
at com.sun.proxy.$Proxy4.click(Unknown Source)
at com.digitalmqc.automation.vendorspages.VendorsHomePageApp.clickOnNotificationsTab(VendorsHomePageApp.java:60)
at com.digitalmqc.automation.vendorstests.VendorsHomePageTest.verifyVendorsHomePageTest(VendorsHomePageTest.java:28)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:86)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:643)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:820)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1128)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:129)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:112)
at org.testng.TestRunner.privateRun(TestRunner.java:782)
at org.testng.TestRunner.run(TestRunner.java:632)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:366)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:361)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:319)
at org.testng.SuiteRunner.run(SuiteRunner.java:268)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1244)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1169)
at org.testng.TestNG.run(TestNG.java:1064)
at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:113)
at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:206)
at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:177)类：
public class LoginIntoVendors
{
@Test
public void verifyLoginVendors() throws Exception
{
WebDriver driver= new FirefoxDriver();
driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
driver.get("******");
IntiationPage vendorInit=PageFactory.initElements(driver, IntiationPage.class);
vendorInit.clickOnLoginButton();
VendorsLoginAction Loginven=PageFactory.initElements(driver, VendorsLoginAction.class);
Loginven.vendorlogin("***","***@gmail.com", "****");
String title = driver.getTitle();
System.out.println("Title is :" + title );
}
}有什么帮助吗？
回答 2
Stack Overflow用户
回答已采纳
发布于 2016-07-21 15:20:52
你需要先初始化你的WebDriver。因为我看到你正在创建WebDriver的引用，但没有初始化，尝试如下:-
WebDriver driver = new ChromeDriver(); //or other driver which you want注意 :-如果你想初始化ChromeDriver，你需要在初始化驱动程序之前下载chromedriver并设置系统属性为:-
System.setProperty("webdriver.chrome.driver", "path/to/chromedriver");所以详细的答案如下：
public class VendorsHomePageTest
{
public WebDriver driver;
@Test
public void verifyVendorsHomePageTest() throws Exception
{
System.setProperty("webdriver.chrome.driver", "path/to/chromedriver");
driver = new ChromeDriver(); //or other driver which you want
LoginIntoVendors login=PageFactory.initElements(driver, LoginIntoVendors.class);
login.verifyLoginVendors();
VendorsHomePageApp vhpapp= PageFactory.initElements(driver, VendorsHomePageApp.class);
//driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
Thread.sleep(3000);
vhpapp.clickOnNotificationsTab();
vhpapp.clickOnProfileTab();
vhpapp.clickOnTendersTab();
vhpapp.clickOnDashboardTab();
vhpapp.clickOnFirstTender();
}
}编辑的 :-你需要创建单独的类来提供WebDriver实例，如下所示:-
public class DriverInit {
public WebDriver driver;
private static DriverInit driverInit = null;
public static DriverInit getInstance() {
if (driverInit == null) {
driverInit = new DriverInit();
}
return driverInit;
}
private DriverInit() {
this.driver = new FirefoxDriver();
this.driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
this.driver.get("******");
}
public WebDriver getDriver() {
return this.driver;
}现在您可以将其调用到LoginIntoVendors中，如下所示:-
public class LoginIntoVendors
{
@Test
public void verifyLoginVendors() throws Exception
{
WebDriver driver = DriverInit.getInstance().getDriver();
IntiationPage vendorInit=PageFactory.initElements(driver, IntiationPage.class);
vendorInit.clickOnLoginButton();
VendorsLoginAction Loginven=PageFactory.initElements(driver, VendorsLoginAction.class);
Loginven.vendorlogin("***","***@gmail.com", "****");
String title = driver.getTitle();
System.out.println("Title is :" + title );
}
}在VendorsHomePageTest中，如下所示：
public class VendorsHomePageTest
{
public WebDriver driver;
@Test
public void verifyVendorsHomePageTest() throws Exception
{
driver = DriverInit.getInstance().getDriver();
LoginIntoVendors login=PageFactory.initElements(driver, LoginIntoVendors.class);
login.verifyLoginVendors();
VendorsHomePageApp vhpapp= PageFactory.initElements(driver, VendorsHomePageApp.class);
//driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
Thread.sleep(3000);
vhpapp.clickOnNotificationsTab();
vhpapp.clickOnProfileTab();
vhpapp.clickOnTendersTab();
vhpapp.clickOnDashboardTab();
vhpapp.clickOnFirstTender();
}
}希望它能有所帮助。：)
Stack Overflow用户
发布于 2016-07-21 15:23:18
你的驱动程序似乎是null的，为了避免这种情况，你可以做的就是引用你的驱动程序。
在你的测试类中，你可以实例化你的驱动。
public class VendorsHomePageTest {
public WebDriver driver;
@Test
public void verifyVendorsHomePageTest() throws Exception {
driver = new FirefoxDriver(); // or whatever browser you want.
// Here you can initialise the elements in `PageObject` class.
VendorsHomePageApp vhpapp= PageFactory.initElements(driver, VendorsHomePageApp.class);
// Rest of your code
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/38497248
复制相关文章
相似问题
腾讯云开发者
