[英]How to solve null pointer exception in selenium webdriver with java
我的Java
public class LaunchApplication {
private String LAUNCHAPPLICATION_STATUS=null;
private String LAUNCHAPPLICATION_MESSAGE=null;
@Test
@Parameters({"RUN_USING_SG","BROWSER_CODE","URL","TITLE","PLATFORM","VERSION"})
public void LAUNCHAPPLICATION(String RunUsingSG,String BrowserCode,String URL,String Title,String Platform,String Version) throws MalformedURLException
{
try
{
System.out.println(System.getProperty("user.dir"));
DesiredCapabilities dc=new DesiredCapabilities();
if(BrowserCode.equalsIgnoreCase("IE32"))
{
System.setProperty("webdriver.ie.driver",System.getProperty("user.dir")+"/AllDrivers/IEDriverServer_32bit_OS.exe");
dc.setBrowserName("internet explorer");
dc.setVersion(Version);
Config.driver = new InternetExplorerDriver();
}
if(BrowserCode.equalsIgnoreCase("IE64"))
{
System.setProperty("webdriver.ie.driver",System.getProperty("user.dir")+"/AllDrivers/IEDriverServer_64bit_OS.exe");
dc.setBrowserName("internet explorer");
dc.setVersion(Version);
Config.driver = new InternetExplorerDriver();
}
if(BrowserCode.equalsIgnoreCase("FF"))
{
FirefoxProfile firefoxProfile = new FirefoxProfile();
dc.setBrowserName("firefox");
dc.setVersion(Version);
Config.driver=new FirefoxDriver();
}
if(RunUsingSG.equalsIgnoreCase("Y"))
{
Config.driver=new RemoteWebDriver(new URL("http://localhost:4444/wd/hub"),dc);
}
if(Platform.equalsIgnoreCase("WINDOWS"))
{dc.setPlatform(org.openqa.selenium.Platform.WINDOWS);}
Config.driver.manage().timeouts().implicitlyWait(30,TimeUnit.SECONDS);
Config.driver.get(URL);
Config.driver.manage().window().maximize();
//perform final validation
if(Config.driver.getTitle().toLowerCase().equalsIgnoreCase(Title))
{
LAUNCHAPPLICATION_STATUS="PASS";
LAUNCHAPPLICATION_MESSAGE="EXPECTED BROWSER TITLE:"+Title+", ACTUAL BROWSER TITLE :"+Config.driver.getTitle()+", FOR THE URL:"+URL;
}
}//end of try
catch(Exception generalException)
{
LAUNCHAPPLICATION_STATUS="FAIL";
LAUNCHAPPLICATION_MESSAGE= "EXPECTED BROWSER TITLE:"+Title+", ACTUAL BROWSER TITLE :"+Config.driver.getTitle()+", FOR THE URL:"+URL+". DETAILS:Exception Occoured:"+generalException.getLocalizedMessage();
}
}
//@BeforeTest
//public void f1(ITestContext ctx) {
// if(ctx.getCurrentXmlTest().getParameter("EXECUTE").equals("NO"))
// {
// throw new SkipException("skiping this test case");
//}
}
通過testng執行時,上面的代碼中出現空指針異常錯誤。我不知道為什么? 當我通過junit執行時工作正常嗎?有什么幫助嗎? 我認為這可能是因為我已聲明LAUNCHAPPLICATION_STATUS = null; 或任何其他問題。
org.testng.TestNGException: java.lang.NullPointerException
at org.testng.TestNG.initializeSuitesAndJarFile(TestNG.java:341)
at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:88)
at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:204)
at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:175)
Caused by: java.lang.NullPointerException
at org.testng.xml.TestNGContentHandler.xmlClasses(TestNGContentHandler.java:342)
at org.testng.xml.TestNGContentHandler.endElement(TestNGContentHandler.java:693)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl.parse(Unknown Source)
at javax.xml.parsers.SAXParser.parse(Unknown Source)
at org.testng.xml.XMLParser.parse(XMLParser.java:39)
at org.testng.xml.SuiteXmlParser.parse(SuiteXmlParser.java:17)
at org.testng.xml.SuiteXmlParser.parse(SuiteXmlParser.java:10)
at org.testng.xml.Parser.parse(Parser.java:168)
at org.testng.TestNG.initializeSuitesAndJarFile(TestNG.java:311)
... 3 more
該異常發生在TestNGContentHandler.endElement()
,這很明顯地表明問題出在您的XML文件中,而不是在LaunchApplication
類中。 在這種情況下,值得針對TestNG提交錯誤以提供更清晰的錯誤消息,具體取決於問題的根源。
嘗試創建一個基本的“ hello world” @Test
,以便您可以驗證TestNG(以及您的TestNG配置)是否完全運行。 如果失敗,我們知道這是配置問題。 否則,如果可行,您可以將其范圍縮小到特定的有問題的測試。
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