为Selenium Webdriver类获取java.lang.NullPointerException [英] Getting java.lang.NullPointerException for selenium webdriver class
问题描述
我对Selenium WebDriver很陌生. java.lang.NullPointerException
一直困扰着我一段时间,我不明白为什么.以下是我的课程,它们实际上非常简单:
I am quite new to Selenium WebDriver. A java.lang.NullPointerException
has been troubling me for sometime now, and I cannot understand why. Following are my classes which are quite simple actually:
package utilities.suiteBase;
import org.openqa.selenium.WebDriver;
import actions.testPage1.testPage1Actions;
import ui_map.testPage1.TestPage1UI;
public class suiteBase {
public WebDriver driver;
protected static TestPage1UI tpui = new TestPage1UI();
protected static testPage1Actions tpa = new testPage1Actions();
}
testPage1Actions.java
package actions.testPage1;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebDriver.Timeouts;
import org.openqa.selenium.WebElement;
import utilities.suiteBase.suiteBase;
public class testPage1Actions extends suiteBase {
public WebDriver driver;
public void test(WebDriver driver){
WebElement loc1 = driver.findElement(By.xpath("id('email')"));
loc1.sendKeys("testing");
System.out.println("done...");
}
}
TestPage1.java
package testPage1;
import org.openqa.selenium.WebDriver;
import org.testng.annotations.Parameters;
import org.testng.annotations.Test;
import utilities.suiteBase.BrowserOpen;
import utilities.suiteBase.suiteBase;
public class TestPage1 extends suiteBase{
public WebDriver driver;
BrowserOpen browse = new BrowserOpen();
@Parameters({ "browserType", "appURL" })
@Test(priority = 1)
public void openBrowser(String browserType, String appURL){
browse.setUp(browserType, appURL);
System.out.println("Done....");
}
@Test(priority = 2)
public void testCase1() throws InterruptedException{
driver.wait(1000);
tpa.test(driver);
}
}
我使用XML运行TestPage1.java文件,遇到以下错误:
I run the TestPage1.java file using XML, where I encounter following error:
java.lang.NullPointerException在 testPage1.TestPage1.testCase1(TestPage1.java:28)位于 sun.reflect.NativeMethodAccessorImpl.invoke0(本机方法)位于 sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 在 sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 在java.lang.reflect.Method.invoke(Method.java:497)在 org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:80) 在org.testng.internal.Invoker.invokeMethod(Invoker.java:714)处 org.testng.internal.Invoker.invokeTestMethod(Invoker.java:901)在 org.testng.internal.Invoker.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)处 org.testng.TestRunner.run(TestRunner.java:617)在 org.testng.SuiteRunner.runTest(SuiteRunner.java:334)在 org.testng.SuiteRunner.runSequentially(SuiteRunner.java:329)在 org.testng.SuiteRunner.privateRun(SuiteRunner.java:291)在 org.testng.SuiteRunner.run(SuiteRunner.java:240)在 org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)在 org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)在 org.testng.TestNG.runSuitesSequentially(TestNG.java:1198)在 org.testng.TestNG.runSuitesLocally(TestNG.java:1123)在 org.testng.TestNG.run(TestNG.java:1031)在 org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:126) 在org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:137) 在org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:58)
java.lang.NullPointerException at testPage1.TestPage1.testCase1(TestPage1.java:28) 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:497) at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:80) at org.testng.internal.Invoker.invokeMethod(Invoker.java:714) at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:901) at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1231) 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:1198) at org.testng.TestNG.runSuitesLocally(TestNG.java:1123) at org.testng.TestNG.run(TestNG.java:1031) at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:126) at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:137) at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:58)
我还有在TestPage1之前运行的browserOpen类,在其中声明了WebDriver
Also I have browserOpen class which I run before TestPage1, in which I declare the WebDriver
package utilities.suiteBase;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.testng.annotations.AfterClass;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Parameters;
import org.testng.annotations.Test;
import utilities.suiteBase.BrowserOpen;
public class BrowserOpen {
public WebDriver driver;
static String driverPath = "E:\\Selenium\\";
public void setUp(String browserType, String appURL) {
try {
setDriver(browserType, appURL);
} catch (Exception e) {
System.out.println("Error....." + e.getStackTrace());
}
}
@AfterClass
public void tearDown() {
driver.quit();
}
private void setDriver(String browserType, String appURL) {
switch (browserType) {
case "chrome":
driver = initChromeDriver(appURL);
break;
case "firefox":
driver = initFirefoxDriver(appURL);
break;
default:
System.out.println("browser : " + browserType
+ " is invalid, Launching Firefox as browser of choice..");
driver = initFirefoxDriver(appURL);
}
}
private static WebDriver initChromeDriver(String appURL) {
System.out.println("Launching google chrome with new profile..");
System.setProperty("webdriver.chrome.driver", driverPath + "chromedriver.exe");
WebDriver driver = new ChromeDriver();
driver.manage().window().maximize();
driver.navigate().to(appURL);
System.out.println("URL inserted");
// driver.get(appURL);
return driver;
}
private static WebDriver initFirefoxDriver(String appURL) {
System.out.println("Launching Firefox browser..");
WebDriver driver = new FirefoxDriver();
driver.manage().window().maximize();
driver.navigate().to(appURL);
return driver;
}
}
推荐答案
我以前从未使用过该技术,但看不到已初始化的元素.
I never used this technology before, but I see not inited elements.
public WebDriver driver;
WebDriver尚未初始化.
您需要先初始化它们,然后再使用.
喜欢:
WebDriver was not initialized.
You need to initialize them before using.
Like:
WebDriver driver = new FirefoxDriver();
或其他.检查一下: http://www.seleniumhq.org/docs/03_webdriver.jsp
-UPD:testCase1()tpa.test(WebDriver)可能引发异常. tpa可能为空.
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