Unable to run simple parallel test with appium using selenium grid

Bắt đầu với phương thức test1 trong stack frame AppiumGridDemo.java được báo cáo, đặc biệt là kết nối RemoteWebDriver tới localhost:4444/wd/hub. Thu thập đầy đủ các log Appium được yêu cầu trong issue và so sánh chúng với thiết lập Selenium Grid và TestNG. Công việc được xem là hoàn tất khi xác định được nguyên nhân có thể tái hiện của lỗi unknown session và ghi lại một cấu hình hoặc bản sửa lỗi hoạt động được.

The problem

I am running a simple demo test to test out parallel testing with appium, selenium grid and testNG. I am getting a session not known error.

Environment

Appium 6.1.0
selenium-server and selenium-java - 3.141.59
testng - 7.4.0

Details

My test is as follows:

`@Test
	public void test1() {
		DesiredCapabilities caps = new DesiredCapabilities();
		try {
			System.out.println("Execution started");
		 	caps.setCapability("platformName", "Android");
			caps.setCapability("deviceName", "R52N20ABC");
			caps.setCapability("platformVersion", "10.0");
			caps.setCapability("udid", "R52N20ABC");
			caps.setCapability("appPackage", "CP.Android");
			caps.setCapability("automationName", "uiautomator2");
			caps.setCapability("appActivity", "crc69e3927.ActivityLicenseBrowse");	
			caps.setCapability("noReset", true);
			caps.setCapability("systemPort", "8201");
			
	
			WebDriver driver = new RemoteWebDriver(new URL("http://localhost:4444/wd/hub"), caps);
			System.out.println("Execution ended");
		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
			
	}`

The following error is seen:

[RemoteTestNG] detected TestNG version 7.4.0
Execution started
FAILED: test1
org.openqa.selenium.NoSuchSessionException: The session identified by 31d74ed5-d2a5-4d63-a758-723062cac718 is not known
Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:17:03'
System info: host: 'PF2JP03M', ip: '192.168.137.1', os.name: 'Windows 10', os.arch: 'amd64', os.version: '10.0', java.version: '1.8.0_261'
Driver info: driver.version: RemoteWebDriver
remote stacktrace: io.appium.uiautomator2.common.exceptions.NoSuchDriverException: The session identified by 31d74ed5-d2a5-4d63-a758-723062cac718 is not known
	at io.appium.uiautomator2.handler.request.SafeRequestHandler.handle(SafeRequestHandler.java:54)
	at io.appium.uiautomator2.server.AppiumServlet.handleRequest(AppiumServlet.java:264)
	at io.appium.uiautomator2.server.AppiumServlet.handleHttpRequest(AppiumServlet.java:258)
	at io.appium.uiautomator2.http.ServerHandler.channelRead(ServerHandler.java:68)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:366)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:352)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:345)
	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:366)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:352)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:345)
	at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:435)
	at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:293)
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:267)
	at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:250)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:366)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:352)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:345)
	at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:266)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:366)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:352)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:345)
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1294)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:366)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:352)
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:911)
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:611)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:552)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:466)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:438)
	at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:140)
	at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:144)
	at java.lang.Thread.run(Thread.java:919)

	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at org.openqa.selenium.remote.W3CHandshakeResponse.lambda$errorHandler$0(W3CHandshakeResponse.java:62)
	at org.openqa.selenium.remote.HandshakeResponse.lambda$getResponseFunction$0(HandshakeResponse.java:30)
	at org.openqa.selenium.remote.ProtocolHandshake.lambda$createSession$0(ProtocolHandshake.java:126)
	at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
	at java.util.Spliterators$ArraySpliterator.tryAdvance(Spliterators.java:958)
	at java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:126)
	at java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:499)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:486)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
	at java.util.stream.FindOps$FindOp.evaluateSequential(FindOps.java:152)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.findFirst(ReferencePipeline.java:464)
	at org.openqa.selenium.remote.ProtocolHandshake.createSession(ProtocolHandshake.java:128)
	at org.openqa.selenium.remote.ProtocolHandshake.createSession(ProtocolHandshake.java:74)
	at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:136)
	at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:552)
	at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:213)
	at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:131)
	at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:144)
	at SeleniumGridDemo.sel.com.test.grid.AppiumGridDemo.test1(AppiumGridDemo.java:28)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:133)
	at org.testng.internal.TestInvoker.invokeMethod(TestInvoker.java:598)
	at org.testng.internal.TestInvoker.invokeTestMethod(TestInvoker.java:173)
	at org.testng.internal.MethodRunner.runInSequence(MethodRunner.java:46)
	at org.testng.internal.TestInvoker$MethodInvocationAgent.invoke(TestInvoker.java:824)
	at org.testng.internal.TestInvoker.invokeTestMethods(TestInvoker.java:146)
	at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:146)
	at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:128)
	at java.util.ArrayList.forEach(ArrayList.java:1259)
	at org.testng.TestRunner.privateRun(TestRunner.java:794)
	at org.testng.TestRunner.run(TestRunner.java:596)
	at org.testng.SuiteRunner.runTest(SuiteRunner.java:377)
	at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:371)
	at org.testng.SuiteRunner.privateRun(SuiteRunner.java:332)
	at org.testng.SuiteRunner.run(SuiteRunner.java:276)
	at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:53)
	at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:96)
	at org.testng.TestNG.runSuitesSequentially(TestNG.java:1212)
	at org.testng.TestNG.runSuitesLocally(TestNG.java:1134)
	at org.testng.TestNG.runSuites(TestNG.java:1063)
	at org.testng.TestNG.run(TestNG.java:1031)
	at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:115)
	at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:251)
	at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:77)


===============================================
    Default test
    Tests run: 1, Failures: 1, Skips: 0
===============================================`

```
## Link to Appium logs

Create a [GIST](https://gist.github.com) which is a paste of your _full_ Appium logs, and link them here.
Do _NOT_ paste your full Appium logs here, as it will make this issue very long and hard to read!
If you are reporting a bug, _always_ include Appium logs!


## Code To Reproduce Issue [ Good To Have ]

Please remember that with sample code it's easier to reproduce the bug and it's much faster to fix it.

Please git clone https://github.com/appium/appium and from the `sample-code` directory, use one of your favorite languages and sample apps to reproduce the issue.

In case a similar scenario is missing in sample-code, please submit a PR with one of the sample apps provided.



What does the error mean and how do i fix it?