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Java PageFactory提供空指针异常

java appium

Java PageFactory提供空指针异常,java,appium,Java,Appium,我试图使用POM创建一个测试框架，但每当我使用PageFactory时，它都会给出一个NullPointerException 我只是试图打开应用程序，检查页面上是否存在给定元素 这是我的驾驶课： public class Driver extends BaseSetup { protected AndroidDriver<MobileElement> driver; public Driver() { this.driver = super.get

我试图使用POM创建一个测试框架，但每当我使用
PageFactory
时，它都会给出一个
NullPointerException

我只是试图打开应用程序，检查页面上是否存在给定元素

这是我的驾驶课：

public class Driver extends BaseSetup
{ 
    protected AndroidDriver<MobileElement> driver;
    public Driver() {
        this.driver = super.getDriver();
    }
}
我得到以下错误：

FAILED: openApplicationValidation
java.lang.NullPointerException
    at com.datamato.pages.OpenApplication.validatePageLoaded(OpenApplication.java:34)
    at com.datamato.tests.OpenApplicationTest.openApplicationValidation(OpenApplicationTest.java:15)
    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:86)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:645)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:822)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1130)
    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)
我应该怎么做才能更正它？

以下是您的程序流程

  • OpenApplication类对象调用参数化构造函数，即。 
    OpenApplication（AppiumDriver驱动程序）{}

  • 然后
    super（）调用驱动程序类构造函数
    

    public Driver（）{this.Driver=super.getDriver（）；}
  • 然后
    super.getDriver（）
    method调用BaseSetup类
    getDriver
    方法，该方法返回
    androidDriver

    • 我几乎可以肯定的是，
    @BeforeClass
    注释方法从未被调用，因此
    androidDriver
    没有初始化

    // System.out.println("Driver in initdriver is : "+androidDriver); This must have not printed.
    这可能不是一个好的解决方案，但您可以在
    getDriver
    中尝试以下方法，如put
    initDriver
    方法，以便在使用驱动程序之前对其进行初始化

    解决方案：

    public AndroidDriver<MobileElement> getDriver() {
initDriver();
return androidDriver;
}
    公共AndroidDriver getDriver（）{ initDriver（）； 返回驱动程序； }
    @Amit Jain，感谢您的快速响应，因为您提到我的@BeforeClass方法没有调用androidDriver，但它的调用和打印也是语句。请查找以下控制台输出，以供参考

    [TestNG] Running:
  C:\Users\DL41\AppData\Local\Temp\testng-eclipse--572591171\testng-customsuite.xml

Inside initDriver method
Argument to driver object : http://0.0.0.0:4723/wd/hub
May 23, 2019 10:03:30 AM io.appium.java_client.remote.AppiumCommandExecutor$1 lambda$0
INFO: Detected dialect: W3C
Driver in initdriver is : io.appium.java_client.android.AndroidDriver, Capabilities: {appActivity=.MainActivity, appPackage=com.BajajServiceApp.VikramUAT, databaseEnabled=false, desired={platformName=android, appActivity=.MainActivity, appPackage=com.BajajServiceApp.VikramUAT, deviceName=OnePlus6T, noReset=true, udid=d6f08719}, deviceManufacturer=OnePlus, deviceModel=ONEPLUS A6010, deviceName=d6f08719, deviceScreenSize=1080x2340, deviceUDID=d6f08719, javascriptEnabled=true, locationContextEnabled=false, networkConnectionEnabled=true, noReset=true, platform=LINUX, platformName=Android, platformVersion=9, takesScreenshot=true, udid=d6f08719, warnings={}, webStorageEnabled=false}
Starting Method :openApplicationValidation
-----------------------------------------
timer start
timer end
Ending Method :openApplicationValidation
-----------------------------------------
FAILED: openApplicationValidation
java.lang.NullPointerException
    at com.datamato.pages.OpenApplication.validatePageLoaded(OpenApplication.java:34)
    at com.datamato.tests.OpenApplicationTest.openApplicationValidation(OpenApplicationTest.java:14)
    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:86)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:645)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:822)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1130)
    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)
    你能突出显示函数中哪一行正在崩溃吗？不清楚第二行是什么34@ShreyTrivedi感谢您的快速响应，下面一行的函数崩溃了：String str=newUser.getText（）@维韦克，我还是不明白哪条线路在崩溃？您能在这里显示吗？@ShreyTrivedi请查看第四行字符串str=newUser.getText（）中的类OpenApplication->method validatePageLoaded（）；好的.“WebElement newUser”应该在哪个阶段初始化？嘿，Amit，谢谢你的快速响应，但是我的@BeforeClass注释方法正在调用androidDriver，请查看下面的控制台输出以供参考。 
    // System.out.println("Driver in initdriver is : "+androidDriver); This must have not printed.

    public AndroidDriver<MobileElement> getDriver() {
initDriver();
return androidDriver;
}

    [TestNG] Running:
  C:\Users\DL41\AppData\Local\Temp\testng-eclipse--572591171\testng-customsuite.xml

Inside initDriver method
Argument to driver object : http://0.0.0.0:4723/wd/hub
May 23, 2019 10:03:30 AM io.appium.java_client.remote.AppiumCommandExecutor$1 lambda$0
INFO: Detected dialect: W3C
Driver in initdriver is : io.appium.java_client.android.AndroidDriver, Capabilities: {appActivity=.MainActivity, appPackage=com.BajajServiceApp.VikramUAT, databaseEnabled=false, desired={platformName=android, appActivity=.MainActivity, appPackage=com.BajajServiceApp.VikramUAT, deviceName=OnePlus6T, noReset=true, udid=d6f08719}, deviceManufacturer=OnePlus, deviceModel=ONEPLUS A6010, deviceName=d6f08719, deviceScreenSize=1080x2340, deviceUDID=d6f08719, javascriptEnabled=true, locationContextEnabled=false, networkConnectionEnabled=true, noReset=true, platform=LINUX, platformName=Android, platformVersion=9, takesScreenshot=true, udid=d6f08719, warnings={}, webStorageEnabled=false}
Starting Method :openApplicationValidation
-----------------------------------------
timer start
timer end
Ending Method :openApplicationValidation
-----------------------------------------
FAILED: openApplicationValidation
java.lang.NullPointerException
    at com.datamato.pages.OpenApplication.validatePageLoaded(OpenApplication.java:34)
    at com.datamato.tests.OpenApplicationTest.openApplicationValidation(OpenApplicationTest.java:14)
    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:86)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:645)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:822)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1130)
    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)