java - ChromeDriver org.openqa.selenium.remote.ProtocolHandshake createSession

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下面是我得到的错误。我已经多次更改 ChromeDriver 和 Chrome 的版本，但没有任何帮助。有人可以找到解决这个问题的方法吗？ junit 4.12 Selenium 版本 3.141.59向大家问好

C:\Program Files\Java\jdk-11.0.6\bin\java.exe"
    Starting ChromeDriver 76.0.3809.12 (220b19a666554bdcac56dff9ffd44c300842c933-refs/branch-heads/3809@{#83}) on port 45366
    Only local connections are allowed.
    Please protect ports used by ChromeDriver and related test frameworks to prevent access by malicious code.
    kwi 22, 2020 7:32:35 PM org.openqa.selenium.remote.ProtocolHandshake createSession
    INFO: Detected dialect: W3C

    java.lang.NullPointerException
        at Panel.GeneralForm.selectClose(GeneralForm.java:63)
        at FormTest.test_for_contact_page(FormTest.java:12)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:566)
        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$2.evaluate(ParentRunner.java:268)
        at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
        at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
        at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
        at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
        at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)
        at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)


    Process finished with exit code -1

Answer 1

由于每个页面对象类中的网络驱动程序缺少初始化，您面临空指针问题，PageFactory 是 Selenium 中内置的页面对象模型概念。除了注释之外，它还允许静态 init 方法来初始化 Web 元素。

您可以在每个页面对象模型中使用以下 init 方法:

   public className(WebDriver driver){
        this.driver = driver;
        PageFactory.initElements(driver, this);
   }