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雖然試圖在Angular Application上運行Protractor e2e測試，但是我的WebDriver Manager卻拋出了NullPointerException異常。WebDriver Manager在嘗試運行Protractor e2e測試時拋出java NullPointerException
這個問題是不是關於NullPointerException的一個問題。這是一個關於如何獲得量角器和端到端測試工作的問題。
我比較了我的設置與同事，比較環境變量，鉻版本等，他們都匹配。然而，它對他有用，但立即失敗在我的開箱。
通過比較我們的輸出，失敗的線是當它正在尋找一個處理程序。在我同事的系統控制檯輸出爲：
12:03:50.295 INFO - Found handler: [email protected]
12:03:50.296 INFO - Handler thread for session 397d539330b46b88d3df3471e0cc30a6 (chrome): Executing POST on /session/397d539330b46b88d3df3471e0cc30a6/timeouts (handler: ServicedSession)
12:03:50.301 INFO - To upstream: {"type":"script","ms":30000}
12:03:50.305 INFO - To downstream: {"sessionId":"397d539330b46b88d3df3471e0cc30a6","status":0,"value":null}
但是在我的dev的盒子，在這一點上，我得到以下幾點：
2017-08-15 12:00:42.145:WARN:osjs.HttpChannel:qtp1227229563-14: /wd/hub/session
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.<init>(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)
at org.openqa.selenium.remote.server.ExceptionHandler.execute(ExceptionHandler.java:88)
at org.openqa.selenium.remote.server.WebDriverServlet.handle(WebDriverServlet.java:247)
at org.openqa.selenium.remote.server.WebDriverServlet.doPost(WebDriverServlet.java:151)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at org.openqa.selenium.remote.server.WebDriverServlet.service(WebDriverServlet.java:111)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.seleniumhq.jetty9.servlet.ServletHolder.handle(ServletHolder.java:841)
at org.seleniumhq.jetty9.servlet.ServletHandler.doHandle(ServletHandler.java:535)
at org.seleniumhq.jetty9.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.seleniumhq.jetty9.security.SecurityHandler.handle(SecurityHandler.java:548)
at org.seleniumhq.jetty9.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at org.seleniumhq.jetty9.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:190)
at org.seleniumhq.jetty9.server.handler.ContextHandler.doHandle(ContextHandler.java:1253)
at org.seleniumhq.jetty9.server.handler.ScopedHandler.nextScope(ScopedHandler.java:168)
at org.seleniumhq.jetty9.servlet.ServletHandler.doScope(ServletHandler.java:473)
at org.seleniumhq.jetty9.server.handler.ScopedHandler.nextScope(ScopedHandler.java:166)
at org.seleniumhq.jetty9.server.handler.ContextHandler.doScope(ContextHandler.java:1155)
at org.seleniumhq.jetty9.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.seleniumhq.jetty9.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at org.seleniumhq.jetty9.server.Server.handle(Server.java:564)
at org.seleniumhq.jetty9.server.HttpChannel.handle(HttpChannel.java:317)
at org.seleniumhq.jetty9.server.HttpConnection.onFillable(HttpConnection.java:251)
at org.seleniumhq.jetty9.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:279)
at org.seleniumhq.jetty9.io.FillInterest.fillable(FillInterest.java:110)
at org.seleniumhq.jetty9.io.ChannelEndPoint$2.run(ChannelEndPoint.java:124)
at org.seleniumhq.jetty9.util.thread.Invocable.invokePreferred(Invocable.java:128)
at org.seleniumhq.jetty9.util.thread.Invocable$InvocableExecutor.invoke(Invocable.java:222)
at org.seleniumhq.jetty9.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:294)
at org.seleniumhq.jetty9.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:126)
at org.seleniumhq.jetty9.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:672)
at org.seleniumhq.jetty9.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:590)
at java.lang.Thread.run(Unknown Source)
什麼的問題可能是有什麼想法？
@WilliamHampshire謝謝，不過selenium-webdriver是作爲對量角器的依賴。我已經卸載並重新安裝了量角器幾次，並沒有任何區別 –
可能重複[什麼是NullPointerException，以及如何解決它？]（https://stackoverflow.com/questions/218384/what-is- a-nullpointerexception-and-how-do-i-fix-it） – JeffC
@JeffC害怕NullPointerException是一個效果而不是原因。問題是如何讓量角器工作並處理它正在拋出的錯誤。 –