Singleton Pattern With Selenium WebDriver + Java + TestNG

In this video, I have explained how to implement Singleton Pattern With Selenium WebDriver + Java + TestNG.
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[@naveenautomationlabs]

GIT Repo URL : github.com/naveenanimation20/SeleniumWithDesignPatterns_Java.git

[@tippanaudayabhaskar8334]

Thank you Naveen for making it clear using Singleton Pattern for parallel run using TestNG.

[@mandheermaan]

I Have watched almost all your videos, you have great depth knowledge with related Selenium and latest techies coming in the market. Great hard work done !!!

[@whovishalmishra]

Amazing, simple and useful.

[@RajibLama]

Thank you Naveen for clear my singleton pattern concept.

[@emb3rke]

Great video, thank you. Why is it recommended to use Singleton pattern regarding WebDriver? What is the benefit of it?

[@gourisankardash646]

@@emb3rke optimization of memory use by avoiding multiple objects creation.

[@J.Ramanathan]

Thank you Naveen

[@Rainbow-Dance-Academy]

Thanks

[@pabitra_swain]

Hi Naveen, I understand Singleton is an important concept from the interview point of view. But I am just wondering why to complecate the setup by introducing it to the DriverManager class. Simple ThreadLocal of WebDriver would also work fine right? Is it like just for shake of having Singleton pattern we are having it? Or really some usecase is there where it will be more benefitial over just ThreadLocal?

[@karnekantiarun4353]

Hi bro thanks for the content one query webdriver manager and app test class are from different package it will works with same package also TIA

[@naveenautomationlabs]

Hi, it doesn't matter. You can call it from anywhere.
Always, design your test classes under src/test/java and non test classes under src/main/java.

[@karnekantiarun4353]

@@naveenautomationlabs Thanks bro pls continue all the design patterns series in java

[@Life_Observers]

Hey Naveen,
Please make a video on how to create portfolio

[@harisharipirala3346]

Thanks for the Information but I have a question. Is it mandatory to implement singleton pattern while using ThreadLocal method. Because threadlocal itself is storing unique web driver thread instances right?

[@bredlin_jose]

Hi Naveen, I integrated the same things with my existing framework, while executing the scripts the execution is not going good as expected.

[@bihari1422]

Memwhile the office laptop is facing difficulty to handle one instance of Chrome(after 114 lot of memory is being consumed by Chrome only )...

[@kamesh70]

Hi Naveen: Got a clarity on how to implement Singleton pattern. I have implemented it following your videos whereas when i triggered parallel tests with different browsers it's running always on chrome even though I have provided chrome, firefox & edge browser. Can you help me the reason.
One more issue. I cloned your repository and tried running the tests and getting
java.lang.IllegalStateException: object already exists
at SeleniumWithSingleton.WebDriverManager.initDriver(WebDriverManager.java:19)
at SeleniumWithSingleton.WebDriverManager.getInstance(WebDriverManager.java:48)
at mytests.AppTest.setUp(AppTest.java:20)
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.testng.internal.invokers.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:139)
at org.testng.internal.invokers.MethodInvocationHelper.invokeMethodConsideringTimeout(MethodInvocationHelper.java:69)
at org.testng.internal.invokers.ConfigInvoker.invokeConfigurationMethod(ConfigInvoker.java:361)
at org.testng.internal.invokers.ConfigInvoker.invokeConfigurations(ConfigInvoker.java:296)
at org.testng.internal.invokers.TestMethodWorker.invokeBeforeClassMethods(TestMethodWorker.java:180)
at org.testng.internal.invokers.TestMethodWorker.run(TestMethodWorker.java:122)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
at org.testng.TestRunner.privateRun(TestRunner.java:829)
at org.testng.TestRunner.run(TestRunner.java:602)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:437)
at org.testng.SuiteRunner$SuiteWorker.run(SuiteRunner.java:475)
at org.testng.internal.thread.ThreadUtil.lambda$execute$0(ThreadUtil.java:58)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)
java.lang.IllegalStateException: object already exists
at SeleniumWithSingleton.WebDriverManager.initDriver(WebDriverManager.java:19)
at SeleniumWithSingleton.WebDriverManager.getInstance(WebDriverManager.java:48)
at mytests.AppTest.setUp(AppTest.java:20)
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.testng.internal.invokers.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:139)
at org.testng.internal.invokers.MethodInvocationHelper.invokeMethodConsideringTimeout(MethodInvocationHelper.java:69)
at org.testng.internal.invokers.ConfigInvoker.invokeConfigurationMethod(ConfigInvoker.java:361)
at org.testng.internal.invokers.ConfigInvoker.invokeConfigurations(ConfigInvoker.java:296)
at org.testng.internal.invokers.TestMethodWorker.invokeBeforeClassMethods(TestMethodWorker.java:180)
at org.testng.internal.invokers.TestMethodWorker.run(TestMethodWorker.java:122)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
at org.testng.TestRunner.privateRun(TestRunner.java:829)
at org.testng.TestRunner.run(TestRunner.java:602)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:437)
at org.testng.SuiteRunner$SuiteWorker.run(SuiteRunner.java:475)
at org.testng.internal.thread.ThreadUtil.lambda$execute$0(ThreadUtil.java:58)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)

[@tester9586]

I get an error same. Hi @naveen, how can we solve this issue?

[@pranavhanwante5301]

Comment below in project
// if (instance != null) { // handling reflection attack
// throw new IllegalStateException("object already exists");
// }