带有PageFactory的Selenium java.lang.NullPointerException
我试图抓住PageFactory POM，但有些东西不起作用，我无法理解什么是错的。
这是我的第一个主页POM课程：
package PageFactory; import org.openqa.selenium.WebDriver; import org.openqa.selenium.WebElement; import org.openqa.selenium.support.FindBy; import org.openqa.selenium.support.PageFactory; public class Home_Page_POF { public WebDriver driver; @FindBy(css = "div#header-profile a#header-profile-toggle") public WebElement profileToggleButton; @FindBy(css = "form#loginUserdataForm div.footer div.add-footer a.btn.btn-link.linkicon") public WebElement newRegistrationButton; public Home_Page_POF(WebDriver driver) { this.driver = driver; PageFactory.initElements(driver, this); } } 这是Reg的第二个POM课程。 页
package PageFactory; import org.openqa.selenium.WebDriver; import org.openqa.selenium.WebElement; import org.openqa.selenium.support.FindBy; import org.openqa.selenium.support.PageFactory; import org.openqa.selenium.support.ui.Select; public class Registration_Page_POF { public WebDriver driver; //Personal details WebElements @FindBy(css = "form#personalDetailsForm div.profile.pe div.profile-block.simple.first fieldset#pefield-title select#pesalutation") public WebElement titleDropdown; public Select titleSelect = new Select(titleDropdown); public Registration_Page_POF(WebDriver driver) { this.driver = driver; PageFactory.initElements(driver, this); } }
这是测试用例：
package Tests; import PageFactory.Home_Page_POF; import PageFactory.Registration_Page_POF; import org.openqa.selenium.WebDriver; import org.openqa.selenium.chrome.ChromeDriver; import org.openqa.selenium.io.TemporaryFilesystem; import org.openqa.selenium.support.ui.Select; import org.testng.annotations.AfterClass; import org.testng.annotations.BeforeClass; import org.testng.annotations.Test; import java.util.concurrent.TimeUnit; public class Test_POF { public WebDriver driver; Home_Page_POF objHomePage; Registration_Page_POF objRegPage; @BeforeClass public void browserSetUp() { System.setProperty("webdriver.chrome.driver", "D:/Install/selenium-2.53.0/drivers/chromedriver.exe"); driver = new ChromeDriver(); driver.manage().window().maximize(); driver.manage().timeouts().implicitlyWait(5, TimeUnit.SECONDS); driver.navigate().to("http://www.lufthansa.com/"); } @AfterClass public void broserCleanUp() { if (driver != null) { TemporaryFilesystem.getDefaultTmpFS().deleteTemporaryFiles(); driver.close(); driver.quit(); } } @Test public void Test0001() { objHomePage = new Home_Page_POF(driver); objHomePage.profileToggleButton.click(); objHomePage.newRegistrationButton.click(); objRegPage = new Registration_Page_POF(driver); Select titleSelect = new Select(objRegPage.titleDropdown); titleSelect.selectByVisibleText("Mr."); } }
所以HomePage对象工作正常，我点击两个按钮，然后进入注册页面。 之后我想从下拉列表中选择一个值，但它给了我NullPointerException：
java.lang.NullPointerException at org.openqa.selenium.support.ui.Select.(Select.java:44) at PageFactory.Registration_Page_POF.(Registration_Page_POF.java:17) at Tests.Test_POF.Test0001(Test_POF.java:56) 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:498) at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:85) at org.testng.internal.Invoker.invokeMethod(Invoker.java:639) at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:816) at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1124) at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125) at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:108) at org.testng.TestRunner.privateRun(TestRunner.java:774) at org.testng.TestRunner.run(TestRunner.java:624) at org.testng.SuiteRunner.runTest(SuiteRunner.java:359) at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:354) at org.testng.SuiteRunner.privateRun(SuiteRunner.java:312) at org.testng.SuiteRunner.run(SuiteRunner.java:261) at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52) at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86) at org.testng.TestNG.runSuitesSequentially(TestNG.java:1215) at org.testng.TestNG.runSuitesLocally(TestNG.java:1140) at org.testng.TestNG.run(TestNG.java:1048) at org.testng.IDEARemoteTestNG.run(IDEARemoteTestNG.java:74) at org.testng.RemoteTestNGStarter.main(RemoteTestNGStarter.java:121) 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:498) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
问题是你正在初级titleSelect类本身中的变量titleSelect 。 Just Initialize内部构造函数或找到元素后;
public class Registration_Page_POF { public WebDriver driver; //Personal details WebElements @FindBy(css = "form#personalDetailsForm div.profile.pe div.profile-block.simple.first fieldset#pefield-title select#pesalutation") public WebElement titleDropdown; public Select titleSelect; //Dont initialize here public Registration_Page_POF(WebDriver driver) { this.driver = driver; PageFactory.initElements(driver, this); titleSelect = new Select(titleDropdown);//initialize here } }