【问题标题】：Cannot instantiate class caused by InvocationTargetException and NullPointerException无法实例化由 InvocationTargetException 和 NullPointerException 引起的类
【发布时间】：2019-10-09 14:46:21
【问题描述】：

enter image description here //基类包 com.IVAPP.qa.Base;

import java.io.File;
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.ie.InternetExplorerDriver;



public class BaseClass {
public static Properties prop;
public static WebDriver driver;



public BaseClass() throws IOException{


    try{
    prop = new Properties();

    //prop.load(this.getClass().getResourceAsStream("C:\\Users\\Jomonli\\workspace\\IVAPP_Automation\\src\\main\\java\\com\\IVAPP\\qa\\Config\\Config.properties"));
    FileInputStream ip = new FileInputStream(System.getProperty("C:\\Users\\Jomonli\\workspace\\IVAPP_Automation\\src\\main\\java\\com\\IVAPP\\qa\\Config\\Config.properties"));
    prop.load(ip);
    }catch(FileNotFoundException e){
        e.printStackTrace();
    }catch(IOException e){
        e.printStackTrace();
    }

}

public void intialization(){
//  String browserName = prop.getProperty("browser");
//
//  if(browserName.equals("IE")){
//      System.setProperty("webdriver.ie.driver","C:\\Users\\Jomonli\\Desktop\\IEDriverServer_x64_3.14.0\\IEDriverServer.exe"); 
//     //driver = new InternetExplorerDriver(); }

    File file = new File("C:\\Users\\Jomonli\\Desktop\\IEDriverServer_x64_3.14.0\\IEDriverServer.exe");
    System.setProperty("webdriver.ie.driver", file.getAbsolutePath());
     driver = new InternetExplorerDriver();


    driver.manage().window().maximize();
    driver.get(prop.getProperty("url"));
}
}

这是扩展为我要运行的类的基类。

LoginPageTest
package com.IVAPP.qa.OffShoreTestCases;

import java.io.IOException;

import org.openqa.selenium.WebDriver;

import org.testng.annotations.AfterMethod;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Test;

import com.IVAPP.qa.Base.BaseClass;
import com.IVAPP.qa.OffShorePage.HomePage;
import com.IVAPP.qa.OffShorePage.LoginPage;



public class LoginPageTest extends BaseClass {
    LoginPage loginpage;
    HomePage homePage;
    WebDriver driver;

public LoginPageTest() throws IOException{
    super();
}

@BeforeMethod
public void setUp() throws IOException{
    intialization();
//   String exePath = "C:\\Users\\Jomonli\\Desktop\\IEDriverServer_x64_3.14.0\\IEDriverServer.exe";
//     //For use of IE only; Please enable for IE Browser
//     System.setProperty("webdriver.ie.driver", exePath);
//     driver = new InternetExplorerDriver();
    this.loginpage =new LoginPage();
    homePage = new HomePage();
}
@Test(description="Logging in with valid credentials")
public void LoginTest() throws IOException{
    homePage = loginpage.login(prop.getProperty("UserID"), prop.getProperty("Password"));
}
@AfterMethod
public void teardown(){
    driver.quit();
}
}

================================================ ==================================================== Testng.xml 文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">
<suite name="Suite">
  <test name="Test">
    <classes>
      <class name="com.IVAPP.qa.OffShoreTestCases.LoginPageTest"/>
    </classes>
  </test> <!-- Test -->
</suite> <!-- Suite -->

这是 testng .xml，它指向我正在尝试运行的正确类，但它说它无法实例化该类。这是否与驱动程序路径有关。

我尝试了 Project>Clean>更新 maven，更改了路径，编写了不同的代码，但没有任何效果

Exception errors
org.testng.TestNGException: 
Cannot instantiate class com.IVAPP.qa.OffShoreTestCases.LoginPageTest
    at org.testng.internal.ObjectFactoryImpl.newInstance(ObjectFactoryImpl.java:40)
    at org.testng.internal.ClassHelper.createInstance1(ClassHelper.java:373)
    at org.testng.internal.ClassHelper.createInstance(ClassHelper.java:285)
    at org.testng.internal.ClassImpl.getDefaultInstance(ClassImpl.java:126)
    at org.testng.internal.ClassImpl.getInstances(ClassImpl.java:191)
    at org.testng.TestClass.getInstances(TestClass.java:104)
    at org.testng.TestClass.initTestClassesAndInstances(TestClass.java:90)
    at org.testng.TestClass.init(TestClass.java:82)
    at org.testng.TestClass.<init>(TestClass.java:45)
    at org.testng.TestRunner.initMethods(TestRunner.java:422)
    at org.testng.TestRunner.init(TestRunner.java:252)
    at org.testng.TestRunner.init(TestRunner.java:222)
    at org.testng.TestRunner.<init>(TestRunner.java:171)
    at org.testng.remote.support.RemoteTestNG6_9_10$1.newTestRunner(RemoteTestNG6_9_10.java:28)
    at org.testng.remote.support.RemoteTestNG6_9_10$DelegatingTestRunnerFactory.newTestRunner(RemoteTestNG6_9_10.java:61)
    at org.testng.SuiteRunner$ProxyTestRunnerFactory.newTestRunner(SuiteRunner.java:604)
    at org.testng.SuiteRunner.init(SuiteRunner.java:170)
    at org.testng.SuiteRunner.<init>(SuiteRunner.java:117)
    at org.testng.TestNG.createSuiteRunner(TestNG.java:1359)
    at org.testng.TestNG.createSuiteRunners(TestNG.java:1346)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1200)
    at org.testng.TestNG.runSuites(TestNG.java:1124)
    at org.testng.TestNG.run(TestNG.java:1096)
    at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:132)
    at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:236)
    at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:81)
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at org.testng.internal.ObjectFactoryImpl.newInstance(ObjectFactoryImpl.java:29)
    ... 25 more
Caused by: java.lang.NullPointerException
    at java.util.Properties$LineReader.readLine(Unknown Source)
    at java.util.Properties.load0(Unknown Source)
    at java.util.Properties.load(Unknown Source)
    at com.IVAPP.qa.Base.BaseClass.<init>(BaseClass.java:28)
    at com.IVAPP.qa.OffShoreTestCases.LoginPageTest.<init>(LoginPageTest.java:23)
    ... 30 more

这是我得到的两个例外

【问题讨论】：

你能粘贴你的测试类吗？你初始化驱动了吗？
是的，我刚刚添加了我的测试类“LoginPageTest”
真的看不出截图中的异常。粘贴完整的堆栈跟踪总是好的。
我也在帖子中添加了这一点

标签： java selenium-webdriver selenium-iedriver

【解决方案1】：

如您所见，尝试读取配置文件时出现异常。

Caused by: java.lang.NullPointerException
    at java.util.Properties$LineReader.readLine(Unknown Source)
    at java.util.Properties.load0(Unknown Source)
    at java.util.Properties.load(Unknown Source)

能否请您更改配置路径？

FileInputStream ip = new FileInputStream("Config/Config.properties");
prop.load(ip);

【讨论】：