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Selenium 独立服务器的实例,节点返回 com.google.gson.JsonPrimitive.isPrimitiveOrString 引发的 500 错误响应 NullPointerException

任何解决此错误的提示都非常感谢。

启动 Selenium 服务器集线器和节点 检查节点是否列在服务器控制台上。

软件版本:

  • 阿帕奇 Maven 3.5.0
  • selenium-server-standalone-3.5.0
  • ChromeDriver 2.31 - geckodriver-v0.18.0-win64
  • Chrome v 60.0.3112.101(64 位)
  • 火狐 55.0.2(64 位)
  • Java 1.8.0_92(64 位)

服务器启动命令:

java -jar "selenium-server-standalone-3.5.0.jar" -role hub 
java -Dwebdriver.gecko.driver="C:/selenium/geckodriver.exe" -jar "selenium-server-standalone-3.5.0.jar" -role node -hub http://localhost:4444/grid/register 

Maven POM:

<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>

<groupId>org.seleniumhq.selenium</groupId>
<artifactId>selenium-java</artifactId>
<version>3.4.0</version>

Java 类(不包括导入):

public class GoogleSearchTest extends TestCase {
public void testApp() throws MalformedURLException {
    DesiredCapabilities cap = DesiredCapabilities.firefox();
    cap.setPlatform(Platform.ANY);

    driver = new RemoteWebDriver(new URL("http://localhost:4444/wd/hub"), cap);
    driver.navigate().to("http://www.google.com/");    
}     }

错误堆栈:

Problem accessing /wd/hub/session. Reason:
Caused by: java.lang.NullPointerException **    at com.google.gson.JsonPrimitive.isPrimitiveOrString(JsonPrimitive.java:278)
at com.google.gson.JsonPrimitive.setValue(JsonPrimitive.java:101)
at com.google.gson.JsonPrimitive.&lt;init&gt;(JsonPrimitive.java:65)
at org.openqa.selenium.remote.server.ExceptionHandler.lambda$execute$0(ExceptionHandler.java:82)
at java.util.stream.ReferencePipeline$3$1.accept(Unknown Source)
at java.util.Spliterators$ArraySpliterator.forEachRemaining(Unknown Source)
at java.util.stream.AbstractPipeline.copyInto(Unknown Source)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source)
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source)
at java.util.stream.AbstractPipeline.evaluate(Unknown Source)
at java.util.stream.ReferencePipeline.collect(Unknown Source)

这个错误似乎在自动化测试的早期就出现了。我还没有答案的问题:发送的 JSON 有效负载是什么,是否需要配置其他功能。

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