使用driver.get时，我得到了java.lang.NullPointerException

Question

我正在尝试在网站上自动执行搜索功能。运行测试用例时，打开Firefox浏览器并正确呈现网站，但系统仍显示空指针，我在其中调用driver.get(URL);代码片段如下：

    package testcases;


    import java.util.concurrent.TimeUnit;
    import org.junit.*;
    import static org.junit.Assert.*;
    import org.openqa.selenium.*;
    import org.openqa.selenium.firefox.FirefoxDriver;

    public class SaavnSearchWeb {
      private WebDriver driver;
      private String baseUrl;
      private boolean acceptNextAlert = true;
      private StringBuffer verificationErrors = new StringBuffer();

      @Before
      public void setUp() throws Exception {
        driver = new FirefoxDriver();
        baseUrl = "http://saavn.com";
        driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);
      }

      @Test
      public void testSaavnSearchWeb() throws Exception {

        driver.get(baseUrl + "/s/artist/deepika-padukone-album/36LfdYhYGvc_");
        if (isElementPresent(By.id("q"))){
            driver.findElement(By.id("q")).sendKeys("cocktail");
            driver.findElement(By.linkText("Tum Hi Ho Bandhu")).click();
        }
      }

      @After
      public void tearDown() throws Exception {
        driver.quit();
        String verificationErrorString = verificationErrors.toString();
        if (!"".equals(verificationErrorString)) {
          fail(verificationErrorString);
        }
      }

      private boolean isElementPresent(By by) {
        try {
          driver.findElement(by);
          return true;
        } catch (NoSuchElementException e) {
          return false;
        }
      }

      private boolean isAlertPresent() {
        try {
          driver.switchTo().alert();
          return true;
        } catch (NoAlertPresentException e) {
          return false;
        }
      }

      private String closeAlertAndGetItsText() {
        try {
          Alert alert = driver.switchTo().alert();
          String alertText = alert.getText();
          if (acceptNextAlert) {
            alert.accept();
          } else {
            alert.dismiss();
          }
          return alertText;
        } finally {
          acceptNextAlert = true;
        }
      }
    }

堆栈跟踪如下：

java.lang.NullPointerException
    at org.openqa.selenium.remote.RemoteWebDriver.get(RemoteWebDriver.java:353)
    at testcases.SaavnSearchWeb.testSaavnSearchWeb(SaavnSearchWeb.java:34)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

有人可以帮帮我吗？

Answer 1

您没有为网址使用正确的协议。将baseUrl更改为如下：

baseUrl = "http://saavn.com";

运行代码。