当我调用方法[duplicate]时在pageObject.PartnerNavigationDrawer.Profile（PartnerNavigationDrawer.java:30）处获取java.lang.NullPointerException。

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此问题已经在这里有了答案：

What is a NullPointerException, and how do I fix it?

（12个答案）

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50秒前

。

当我通过使用从PartnerLogin POM类到Test1类的所有对象来运行测试类时，效果很好。问题出在我尝试调用login.Login();包含所有来自PartnerLogin POM类方法（从另一个类）的对象的对象，然后立即调用profile对象时，出现

空指针异常

错误：

java.lang.NullPointerException在页面object.PartnerNavigationDrawer.Profile（PartnerNavigationDrawer.java:30）

我该如何解决？

POM类别

package pageObject;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;

public class PartnerNavigationDrawer {

    public WebDriver driver;

    public PartnerNavigationDrawer(WebDriver driver) {
        // TODO Auto-generated constructor stub
        this.driver = driver;
    }

    By Dashboard = By.cssSelector("a[href='partner_dashboard.php']");

    By Profile = By.cssSelector("a[href='partner_page.php']");

    public WebElement Dashboard() {

        return driver.findElement(Dashboard);

    }

    public WebElement Profile() {

        return driver.findElement(Profile);
    }

}

测试类别

   package com.rslsolution;

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.testng.annotations.Test;

import mainTest.PartnerLoginTest;
import com.rslsolution.Base;

import pageObject.PartnerLogin;
import pageObject.PartnerNavigationDrawer;

public class Test1 extends Base{

    String baseUrl = System.getProperty("user.dir");
    Properties pro = new Properties();
    FileInputStream fis;
     WebDriver driver;


    @Test
    public void testMethod() throws InterruptedException, IOException
    {
        fis =new FileInputStream(baseUrl+"\\DataDriven\\DataDriven.properties");
        pro.load(fis);

//      driver = initializeBrowser();
//      driver.get(pro.getProperty("appUrl"));
        PartnerLoginTest partnerLogin=new PartnerLoginTest();

        Thread.sleep(3000);
         partnerLogin.Login();
        Thread.sleep(3000);
//      PartnerLogin login=new PartnerLogin(driver);
//      Thread.sleep(3000);
//      login.Partner_Login().click();
//      Thread.sleep(3000);
//      login.email().sendKeys(pro.getProperty("userName"));
//      login.password().sendKeys(pro.getProperty("partnerPassword"));
//      login.Login_Button().click();
        PartnerNavigationDrawer navigationDrawer = new PartnerNavigationDrawer(driver);
        navigationDrawer.Profile().click();



        System.out.println("Checking git push command");

} 
}

错误日志

java.lang.NullPointerException
    at pageObject.PartnerNavigationDrawer.Profile(PartnerNavigationDrawer.java:28)
    at com.rslsolution.Test1.testMethod(Test1.java:35)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:108)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:669)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:877)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1201)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109)
    at org.testng.TestRunner.privateRun(TestRunner.java:776)
    at org.testng.TestRunner.run(TestRunner.java:634)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:425)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:420)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:385)
    at org.testng.SuiteRunner.run(SuiteRunner.java:334)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1318)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1243)
    at org.testng.TestNG.runSuites(TestNG.java:1161)
    at org.testng.TestNG.run(TestNG.java:1129)
    at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:114)
    at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:251)
    at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:77)

PartnerLogin类

package pageObject;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;

public class PartnerLogin {
    WebDriver driver;

    public PartnerLogin(WebDriver driver) {

        this.driver = driver;
    }

    By Partner_Login = By.xpath("/html/body/div[3]/p/a[3]/b/span");

    By email = By.cssSelector("input[id='userName']");

    By password = By.cssSelector("input[id='pass']");

    By Login_Button = By.cssSelector("button[id='submit']");

    public WebElement Partner_Login() {

        return driver.findElement(Partner_Login);

    }

    public WebElement email() {


        return driver.findElement(email);
    }

    public WebElement password() {


        return driver.findElement(password);
    }

    public WebElement Login_Button() {


        return driver.findElement(Login_Button);
    }

}

当我通过使用从PartnerLogin POM类到Test1类的所有对象来运行测试类时，效果很好。问题出在我尝试调用login.Login（）;时。其中包含所有对象形式...

Answer 1

driver在类Test1中为null。我看不到您在何处分配值。