I am trying to run 2 different tests on 2 different emulators parallelly. But my execution halts on 1 device as soon as the test on other device is complete. I am using the below driver setup code

capabilities = new DesiredCapabilities();
capabilities.setCapability("platformName", "Android");
capabilities.setCapability("VERSION", platformVersion);
capabilities.setCapability("udid", deviceName);
capabilities.setCapability("app", "app.apk");
capabilities.setCapability("appPackage", "xxx");
capabilities.setCapability("appActivitiy", "xxx.HomeActivity");
capabilities.setCapability("systemPort", systemPort);
driver = new AndroidDriver(new URL(""), capabilities);

And below is my testNG.xml file

<?xml version="1.0" encoding="UTF-8"?>
<suite name="Parallel Tests" parallel="tests" thread-count="2">
    <test name="Android native app test on Android 12">
        <parameter name="platformVersion" value="12"/>
        <parameter name="deviceName" value="emulator-5554"/>
        <parameter name="systemPort" value="6666"/>
            <class name="LoginTest" />
    <test name="Android native app test on Android 10">
        <parameter name="platformVersion" value="10"/>
        <parameter name="deviceName" value="emulator-5556"/>
        <parameter name="systemPort" value="8666"/>
            <class name="SignUpTest" />

I get the following exception

org.openqa.selenium.NoSuchSessionException: Session ID is null. Using WebDriver after calling quit()?

And sometimes this exception as well

org.openqa.selenium.NoSuchSessionException: A session is either terminated or not started

1 Answer 1



What is the problem & why its happening?

  • Your test on 1 device gets halted because, I can see how you have initialise your driver static using port 4723
    driver = new AndroidDriver(new URL(""), capabilities);

Solution :

  • When you want to execute tests in parallel you should :
    • Create no. of driver instances equal to the same no. of devices to perform tests
    • You should have different port for each driver instance
    • Example :
      1. If I want to run tests on 2 devices
      2. Driver should be initialise separately with separate port number
  // Driver 1: 
  driver1 = new AndroidDriver(new URL(""), capabilities);

  //Driver 2
  driver2 = new AndroidDriver(new URL(""), capabilities);

Note - To run tests in parallel, you do not need to run two separate instances of appium server. Parallel support has been implemented after version 1.5 onwards

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