TestNG-并行测试执行，WebDriver nullpointer

Question

import config.DriverFactory;
import org.junit.Assert;
import org.testng.annotations.Test;
import org.openqa.selenium.WebDriver;

public class SecondTestClass {

    WebDriver driver;

    public SecondTestClass()throws Exception{
        DriverFactory.getInstance().setDriver();
        driver = DriverFactory.getInstance().getDriver();;
    }

    @Test
    public void testInSecondClass() {
        System.out.println("\n THREAD ID: " + Thread.currentThread().getId() + " " + "\n Name: " + Thread.currentThread().getName());
        driver.get("https://www.allsaints.com");
        System.out.println("CURRENT URL IS :" + driver.getCurrentUrl());

        Assert.assertTrue(false);

    }
}

package testParallel;

import config.DriverFactory;
import org.openqa.selenium.WebDriver;
import org.testng.annotations.Test;
public class FirstTestClass {

    WebDriver driver;

    public FirstTestClass()throws Exception{
        DriverFactory.getInstance().setDriver();
        driver = DriverFactory.getInstance().getDriver();;
    }

    @Test
    public void testInFirstClass() throws Exception{
        System.out.println("\n THREAD ID: " + Thread.currentThread().getId() + " " + "\n Name: " + Thread.currentThread().getName());
        DriverFactory.getInstance().setDriver();
        driver = DriverFactory.getInstance().getDriver();;
        driver.get("https://pl.wikipedia.org");
        System.out.println("CURRENT URL IS :" + driver.getCurrentUrl());
    }
}

package config;

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;

public class DriverFactory {

    private static DriverFactory instance = null;

    public ThreadLocal<WebDriver> webDriver = new ThreadLocal<WebDriver>();

    private DriverFactory() {}

    @SuppressWarnings("varargs")
    public static DriverFactory getInstance() {
        if (instance == null) {
            instance = new DriverFactory();
        }
        return instance;
    }

    public final void setDriver() throws Exception {
        System.setProperty("webdriver.gecko.driver", "E:\\Projects\\allsaints\\tess\\drivers\\geckodriver.exe");
        webDriver.set(new FirefoxDriver());
    }

    public WebDriver getDriver() throws Exception {
        return webDriver.get();
    }
}

import config.DriverFactory;
import org.openqa.selenium.WebDriver;
import org.testng.ITestResult;
import org.testng.TestListenerAdapter;

public class testSetup extends TestListenerAdapter {

    @Override
    public void onTestFailure(ITestResult tr) {
        System.out.println(
                "\n THREAD ID: " + Thread.currentThread().getId() + " " +
                        "\n Name: " + Thread.currentThread().getName()

        );
        WebDriver driver;
        try {
             driver = DriverFactory.getInstance().getDriver();
            System.out.println("CURRENT URL IS :" + driver.getCurrentUrl());

        } catch (Exception e) {
            e.printStackTrace();
        }
        super.onTestFailure(tr);
    }
}

<?xml version="1.0"?>
<suite name="All Test Suite" parallel="tests" thread-count="5">
    <listeners>
        <listener class-name="testParallel.testSetup"/>
    </listeners>
    <test verbose="3" preserve-order="true" name="test1">
        <classes>
            <class name="testParallel.FirstTestClass"/>
        </classes>
    </test>
    <test name="test2">
        <classes>
            <class name="testParallel.SecondTestClass"/>
        </classes>
    </test>
</suite>

类TestParallel.FirstTestClass线程ID：22名称：TestNG

类TestParallel.SecondTestClass线程ID：23名称：TestNG

类TestParallel.TestSetup线程ID：23名称：TestNG java.lang.NullPoInterException位于TestParallel.TestSetup.OnTestFailure(TestSetup.java:21)位于Org.TestNG.Internal.Invoker.RunTestListeners（Invoker.java:1895)位于Org.TestNG.Internal.Invoker.RunTestListeners（Invoker.java:1879)位于Org.TestNG.Internal.Invoker.InvokeMethod（Invoker.java:778)位于Org.TestNG.Internal.Invoker.InvokeMethod（Invoker.java:901）位于Org.TestNG.Internal.Invoker.InvokeMethod（Invoker.java InvokeTestMethods（invoker.java:1231)在org.TestNG.internal.testMethodworker.invokeTestMethods（testMethodworker.java:127)在org.TestNG.internal.testMethodworker.run（testMethodworker.java:111)在org.TestNG.testRunner.privaterun（testRunner.java:767)在org.TestNG.testRunner.run（testRunner.java:617)在org.TestNG.suiterunner.runtest（testRunner.java:334)在org.TestNG.suiterunner.access$000（suiterunner$suiteworker.run(suiterunner.java:368)在org.TestNG.internal.THREAD.threadutil$2。call(threadutil.java:64)在java.util.conCurrent.FutureTask.Run（FutureTask.java:266)在java.util.concurrent.ThreadPoolExecutor.RunWorker（ThreadPoolExecutor.java:1142)在java.util.concurrent.ThreadPoolExecutor$Worker.Run（ThreadPoolExecutor.617)在java.lang.Thread.Run（Thread.java:745)当前URL为:https://pl.wikipedia.org/wiki/wikipedia:strona_g%c5%82%c3%b3WNA

Answer 1

在侦听器中，我们不能直接访问其他类实例。因为，它会在执行开始时启动listen。如果我们需要获得某个特定的类实例，那么我们可以通过TestNG监听器(itestresult)访问，如下所示，并且您的所有测试类都应该继承DriverFactory类。

侦听器类代码：

public class testSetup extends TestListenerAdapter {

    @Override
    public void onTestFailure(ITestResult tr) {
        System.out.println(
                "\n THREAD ID: " + Thread.currentThread().getId() + " " +
                        "\n Name: " + Thread.currentThread().getName()

        );

        Object currentClass=tr.getInstance();

        WebDriver driver;
        try {
             driver =((DriverFactory) currentClass).getDriver();
            System.out.println("CURRENT URL IS :" + driver.getCurrentUrl());

        } catch (Exception e) {
            e.printStackTrace();
        }
        super.onTestFailure(tr);
    }

}

测试类1：

public class FirstTestClass extends DriverFactory {

    WebDriver driver;

public class SecondTestClass extends DriverFactory {

    WebDriver driver;