java.lang.NullPointerException webdriver(java.lang.NullPointerException webdriver)

 我是使用webdriver进行autoamted测试的新手。有人请检查我收到的原因 
 
java.lang.NullPointerException
    at SuccessfullHoverTestCib.testSuccessfullHoverTestCib
    (SuccessfullHoverTestCib.java:29)
    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).....
 
 我正在运行以下代码： 
 
public class SuccessfullHoverTestCib {
    private WebDriver driver;
    private String baseUrl;
    private StringBuffer verificationErrors = new StringBuffer();

    @Before
    public void setUp() throws Exception {
        File pathToFirefoxBinary = new File("C:\\Documents and Settings\\chakarova\\Local Settings\\Application Data\\Mozilla Firefox\\firefox.exe");  
        FirefoxBinary firefoxbin = new FirefoxBinary(pathToFirefoxBinary);
        WebDriver driver = new FirefoxDriver(firefoxbin,null); 
        baseUrl = "http://cibnew.sofia.ifao.net:7001/cib_web/web";
        driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);
    }

    @Test
    public void testSuccessfullHoverTestCib() throws Exception {
        driver.get(baseUrl);
        driver.findElement(By.id("inputButton")).click();
        driver.findElement(By.linkText("Hotels")).click();
        driver.findElement(By.id("pageLink_57")).click();
    }

    @After
    public void tearDown() throws Exception {
        driver.quit();
        String verificationErrorString = verificationErrors.toString();
        if (!"".equals(verificationErrorString)) {
            fail(verificationErrorString);
        }
    }
 
 当我指向错误跟踪时，它链接到Test method->driver.get(baseUrl); 我认为这个问题与firefox.exe路径的定义有关，但我不知道如何解决它。任何帮助将不胜感激。 

I'm a newbie in the autoamted testing using webdriver.Would somebody please check why I'm receiving 
 
java.lang.NullPointerException
    at SuccessfullHoverTestCib.testSuccessfullHoverTestCib
    (SuccessfullHoverTestCib.java:29)
    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).....
 
I'm running the following code:
 
public class SuccessfullHoverTestCib {
    private WebDriver driver;
    private String baseUrl;
    private StringBuffer verificationErrors = new StringBuffer();

    @Before
    public void setUp() throws Exception {
        File pathToFirefoxBinary = new File("C:\\Documents and Settings\\chakarova\\Local Settings\\Application Data\\Mozilla Firefox\\firefox.exe");  
        FirefoxBinary firefoxbin = new FirefoxBinary(pathToFirefoxBinary);
        WebDriver driver = new FirefoxDriver(firefoxbin,null); 
        baseUrl = "http://cibnew.sofia.ifao.net:7001/cib_web/web";
        driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);
    }

    @Test
    public void testSuccessfullHoverTestCib() throws Exception {
        driver.get(baseUrl);
        driver.findElement(By.id("inputButton")).click();
        driver.findElement(By.linkText("Hotels")).click();
        driver.findElement(By.id("pageLink_57")).click();
    }

    @After
    public void tearDown() throws Exception {
        driver.quit();
        String verificationErrorString = verificationErrors.toString();
        if (!"".equals(verificationErrorString)) {
            fail(verificationErrorString);
        }
    }
 
When I point to the error trace, it links to the Test method->driver.get(baseUrl); I think the problem is connected with the definition of the path to the firefox.exe,but I don't know how to fix it.Any help will be appreciated.

原文：https://stackoverflow.com/questions/12747658