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我是学习Selenium WebDriver和Java的一周新手。Selenium中的java.lang.NullPointerException TestNG
我试着创建一个测试脚本来运行TestNG。
我有2个java文件和低于1周的testng.xml：
[1] adminBase.java
package automation;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.support.CacheLookup;
import org.openqa.selenium.support.FindBy;
import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;
public class adminBase {
static WebDriver driver;
public static String appURL = "https://00.0.00.00:0000/admin/";
public static String testData = "C:\src\TestData.xls";
//Declare fields on pageObject that are webElements
@FindBy(id = "j_username")
static WebElement username;
@CacheLookup
@FindBy(id = "j_password")
static WebElement password;
@CacheLookup
@FindBy(id = "login")
static WebElement loginBtn;
@FindBy(xpath = ".//*[@id='LogoutForm']/li/span/a")
static WebElement logoutBtn;
//This method will take two arguments (Username and Password)
public void loginInfo(String sUsername, String sPassword){
username.sendKeys(sUsername);
password.sendKeys(sPassword);
loginBtn.click();
}
//To read Excel file
public String[][] getExcelData(String fileName, String sheetName) {
String[][] arrayExcelData = null;
try {
FileInputStream fs = new FileInputStream(fileName);
Workbook wb = Workbook.getWorkbook(fs);
Sheet sh = wb.getSheet(sheetName);
int totalNoOfCols = sh.getColumns();
int totalNoOfRows = sh.getRows();
arrayExcelData = new String[totalNoOfRows-1][totalNoOfCols];
for (int i=1; i<totalNoOfRows; i++){
for (int j=0; j<totalNoOfCols; j++){
arrayExcelData[i-1][j] = sh.getCell(j, i).getContents();
}
}
}
catch (FileNotFoundException e){
e.printStackTrace();
}
catch (IOException e){
e.printStackTrace();
}
catch (BiffException e){
e.printStackTrace();
}
return arrayExcelData;
}
}
并且还[2] adminLogin.java
package automation;
import org.testng.annotations.Test;
import org.testng.annotations.BeforeMethod;
import java.util.concurrent.TimeUnit;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.testng.annotations.AfterMethod;
import org.testng.annotations.DataProvider;
public class adminLogin {
WebDriver driver;
adminBase adminbase;
String testData;
@BeforeMethod
public void beforeTest() throws Exception {
driver = new FirefoxDriver();
driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
//adminbase = PageFactory.initElements(driver, adminBase.class);
}
@DataProvider(name="loginInfo")
public Object[][] getData() throws Exception {
Object[][] user = adminbase.getExcelData(testData, "adminLogin");
return user;
}
@Test(dataProvider="loginInfo")
public void test(String appURL, String sUsername, String sPassword)
throws Exception {
driver.get(appURL);
adminbase.loginInfo(sUsername, sPassword);
}
@AfterMethod
public void afterTest() throws InterruptedException{
Thread.sleep(3000);
driver.quit();
}
}
[ 3] testng.xml：
<?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 = "automation.adminLogin"/>
</classes>
</test> <!-- Test -->
</suite> <!-- Suite -->
但是，我得到异常
java.lang.RuntimeException: java.lang.NullPointerException
at org.testng.internal.MethodInvocationHelper.invokeDataProvider(MethodInvocationHelper.java:161)
at org.testng.internal.Parameters.handleParameters(Parameters.java:429)
at org.testng.internal.Invoker.handleParameters(Invoker.java:1383)
at org.testng.internal.Invoker.createParameters(Invoker.java:1075)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1180)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:127)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111)
at org.testng.TestRunner.privateRun(TestRunner.java:767)
at org.testng.TestRunner.run(TestRunner.java:617)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:334)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:329)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:291)
at org.testng.SuiteRunner.run(SuiteRunner.java:240)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1224)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1149)
at org.testng.TestNG.run(TestNG.java:1057)
at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:111)
at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:204)
at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:175)
Caused by: java.lang.NullPointerException
at java.io.FileInputStream.<init>(Unknown Source)
at java.io.FileInputStream.<init>(Unknown Source)
at automation.adminBase.getExcelData(adminBase.java:48)
at automation.adminLogin.getData(adminLogin.java:27)
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:84)
at org.testng.internal.MethodInvocationHelper.invokeDataProvider(MethodInvocationHelper.java:135)
... 20 more
下面从我的理解在adminLogin.java文件行automation.adminLogin.getData（adminLogin.java:27）
27行有错误是这样一行：
(Object[][] user = adminbase.getExcelData(testData, "adminLogin");
我明白，错误可能是由于我传递参数为null。但我只是不知道如何解决，因为我没有得到我的文件中的任何错误
我的代码真的很乱。因为我只是混搭而已。 我真的很抱歉谁读了我的代码头痛。 >。 <
请注意并帮助我改进。 谢谢！
你用'调试器'尝试？找出这种问题的最好方法是'debuger' –
Hi @RuchiraGayanRanaweera 你能告诉我如何使用调试器吗？ – dieyb
当然。你用于编码的IDE是什么？那里有调试选项。 –