[selenium-users] Null pointer exception on Driver.Close line

[i***@gmail.com]

Hi All

Please bear with me for asking a silly question but iam curious to know the
technical reason for why iam getting 'Null pointer exception' for
literally a simple one line code. I have written code so many time but i
was trying to check whether
my system (new this time) has all files and exe's to run the Selenium Code
on my system.
So, was trying to add/download the files as and when it started giving me
error and fixing it up.

What iam trying to do : I wrote the script to check if all
files/jars/testng.exe are there to open the gmail page in my system and
close it.


*Code *:->

package pkg;

import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.firefox.FirefoxDriver.SystemProperty;
import org.testng.annotations.AfterMethod;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Test;

public class TC_01 {

ChromeDriver driver;
@BeforeMethod
public void ST(){
System.setProperty("webdriver.chrome.driver",
"C:\\Selenium\\chromedriver.exe");
ChromeDriver driver = new ChromeDriver();
driver.get("https://www.google.com/gmail/about/#");
}
@Test
public void TM(){
}
@AfterMethod
public void CM(){
*driver.quit(); // Getting error at this point*
}
}



What error iam getting : Getting on line 26 : driver.quit


Starting ChromeDriver 2.32.498550
(9dec58e66c31bcc53a9ce3c7226f0c1c5810906a) on port 40532
Only local connections are allowed.
Sep 20, 2017 1:35:39 PM org.openqa.selenium.remote.ProtocolHandshake
createSession
INFO: Detected dialect: OSS
FAILED CONFIGURATION: @AfterMethod CM
java.lang.NullPointerException
at pkg.TC_01.CM(TC_01.java:26)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:108)
at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:523)
at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:224)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:731)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:877)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1201)
at
org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109)
at org.testng.TestRunner.privateRun(TestRunner.java:776)
at org.testng.TestRunner.run(TestRunner.java:634)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:425)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:420)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:385)
at org.testng.SuiteRunner.run(SuiteRunner.java:334)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1318)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1243)
at org.testng.TestNG.runSuites(TestNG.java:1161)
at org.testng.TestNG.run(TestNG.java:1129)
at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:114)
at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:251)
at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:77)

PASSED: TM




My control is not reaching there. Any guidance would be appreciated.
Thanks in advance.

[Krishnan Mahadevan]

Please change

public void ST(){

    System.setProperty("webdriver.chrome.driver", "C:\\Selenium\\chromedriver.exe");

    ChromeDriver driver = new ChromeDriver();

    driver.get("https://www.google.com/gmail/about/#");

}



To:

public void ST(){

    System.setProperty("webdriver.chrome.driver", "C:\\Selenium\\chromedriver.exe");

    driver = new ChromeDriver();

    driver.get("https://www.google.com/gmail/about/#");

}



The problem is that in your ST() you are shadowing out the class level data member driver



Thanks & Regards

Krishnan Mahadevan



"All the desirable things in life are either illegal, expensive, fattening or in love with someone else!"

My Scribblings @ http://wakened-cognition.blogspot.com/

My Technical Scribbings @ http://rationaleemotions.wordpress.com/



From: <selenium-***@googlegroups.com> on behalf of <***@gmail.com>
Reply-To: <selenium-***@googlegroups.com>
Date: Thursday, September 21, 2017 at 2:47 AM
To: Selenium Users <selenium-***@googlegroups.com>
Subject: [selenium-users] Null pointer exception on Driver.Close line



Hi All



Please bear with me for asking a silly question but iam curious to know the technical reason for why iam getting 'Null pointer exception' for

literally a simple one line code. I have written code so many time but i was trying to check whether

my system (new this time) has all files and exe's to run the Selenium Code on my system.

So, was trying to add/download the files as and when it started giving me error and fixing it up.



What iam trying to do : I wrote the script to check if all files/jars/testng.exe are there to open the gmail page in my system and close it.





Code :->



package pkg;



import org.openqa.selenium.chrome.ChromeDriver;

import org.openqa.selenium.firefox.FirefoxDriver.SystemProperty;

import org.testng.annotations.AfterMethod;

import org.testng.annotations.BeforeMethod;

import org.testng.annotations.Test;



public class TC_01 {



                ChromeDriver driver;

                @BeforeMethod

                public void ST(){

                                System.setProperty("webdriver.chrome.driver", "C:\\Selenium\\chromedriver.exe");

                                ChromeDriver driver = new ChromeDriver();

                                driver.get("https://www.google.com/gmail/about/#");

                }

               

                @Test

                public void TM(){

                               

                }

               

                @AfterMethod

                public void CM(){

                                driver.quit(); // Getting error at this point

                }

}







What error iam getting : Getting on line 26 : driver.quit





Starting ChromeDriver 2.32.498550 (9dec58e66c31bcc53a9ce3c7226f0c1c5810906a) on port 40532

Only local connections are allowed.

Sep 20, 2017 1:35:39 PM org.openqa.selenium.remote.ProtocolHandshake createSession

INFO: Detected dialect: OSS

FAILED CONFIGURATION: @AfterMethod CM

java.lang.NullPointerException

                at pkg.TC_01.CM(TC_01.java:26)

                at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

                at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

                at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

                at java.lang.reflect.Method.invoke(Unknown Source)

                at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:108)

                at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:523)

                at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:224)

                at org.testng.internal.Invoker.invokeMethod(Invoker.java:731)

                at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:877)

                at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1201)

                at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)

                at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109)

                at org.testng.TestRunner.privateRun(TestRunner.java:776)

                at org.testng.TestRunner.run(TestRunner.java:634)

                at org.testng.SuiteRunner.runTest(SuiteRunner.java:425)

                at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:420)

                at org.testng.SuiteRunner.privateRun(SuiteRunner.java:385)

                at org.testng.SuiteRunner.run(SuiteRunner.java:334)

                at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)

                at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)

                at org.testng.TestNG.runSuitesSequentially(TestNG.java:1318)

                at org.testng.TestNG.runSuitesLocally(TestNG.java:1243)

                at org.testng.TestNG.runSuites(TestNG.java:1161)

                at org.testng.TestNG.run(TestNG.java:1129)

                at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:114)

                at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:251)

                at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:77)



PASSED: TM









My control is not reaching there. Any guidance would be appreciated.

Thanks in advance.









--
You received this message because you are subscribed to the Google Groups "Selenium Users" group.
To unsubscribe from this group and stop receiving emails from it, send an email to selenium-users+***@googlegroups.com.
To post to this group, send email to selenium-***@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/selenium-users/9f19e642-8fe3-4a70-988c-d931447a35bb%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.