Singleton Pattern With Selenium WebDriver + Java + TestNG

[@naveenautomationlabs]

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

[@panther0761]

Really a nice topic and it just enhanced our knowledge day by day

[@sayalichandane9312]

Thank you Naveen, you really doing very good job by upgrading all Job seekers to have latest technology understanding in simple and detailed way. I am currecntly trying to switch job and referring all your videos for interview. Thanks a lot again!!!

[@snehalpujari2982]

Thank you Naveen for such insightful content which keep motivating us and help lot to improve knowledge.

[@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 !!!

[@tippanaudayabhaskar8334]

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

[@RajibLama]

Thank you Naveen for clear my singleton pattern concept.

[@MasterCardAmitJain]

Wow Naveen

[@JailParavai]

Excellent Bro

[@whovishalmishra]

Amazing, simple and useful.

[@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

[@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.

[@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

[@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?

[@zakirvnr6011]

When, we are telling, we have implemented singleton pattern. We mean same object is shared. From basic java, we know an object has state. Since same obejct is being shared does it cause interference, if two tests use same object.

[@Life_Observers]

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

[@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 )...

[@Sanutainment]

Thanks

[@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"); // }