Failed Configuration - Null point Exception - automated-tests

Question

I am new for programming and testing. Just page object and a test case, tried to execute it. Test failed and got null point exception. If some one could help with this, that will be great.
I have googled about this, found a similar error but answer did not helped me
This is my first test case for login page:
package com.ProjectName.TestCases;
import org.testng.annotations.Test;
import com.ProjectName.PageObject.LoginPage;
import junit.framework.Assert;
public class TC_LoginTest_001 extends BassClass{
#Test
public void loginTest()
{
driver.get(baseURL);
LoginPage lp = new LoginPage(driver);
lp.setUserName(username);
lp.setPassword(password);
lp.clickSubmit();
if(driver.getTitle().equals("Guru99 Bank Manager HomePage"))
{
Assert.assertTrue(true);
//logger.info("Login test passed");
}
else
{
//captureScreen(driver,"loginTest");
Assert.assertTrue(false);
//logger.info("Login test failed");
}
}
}
Base class to include common things:
package com.ProjectName.TestCases;
import org.openqa.selenium.WebDriver;
import org.testng.annotations.AfterClass;
import org.testng.annotations.BeforeClass;
public class BassClass {
public String baseURL = "http://demo.guru99.com/V4/index.php";
public String username = "mngr201172";
public String password = "tysemUz";
public static WebDriver driver;
#BeforeClass
public void setup()
{
System.setProperty("Webdriver.chrome.driver", System.getProperty("user.dir")+"//Drivers//chromedriver.exe");
}
#AfterClass
public void tearDown()
{
driver.quit();
}
}
Error:
[RemoteTestNG] detected TestNG version 6.14.3
FAILED CONFIGURATION: #AfterClass tearDown
java.lang.NullPointerException
at com.ProjectName.TestCases.BassClass.tearDown(BassClass.java:23)
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:567)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:124)
at org.testng.internal.MethodInvocationHelper.invokeMethodConsideringTimeout(MethodInvocationHelper.java:59)
at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:458)
at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:222)
at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:142)
at org.testng.internal.TestMethodWorker.invokeAfterClassMethods(TestMethodWorker.java:214)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111)
at org.testng.TestRunner.privateRun(TestRunner.java:648)
at org.testng.TestRunner.run(TestRunner.java:505)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:455)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:450)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:415)
at org.testng.SuiteRunner.run(SuiteRunner.java:364)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:84)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1208)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1137)
at org.testng.TestNG.runSuites(TestNG.java:1049)
at org.testng.TestNG.run(TestNG.java:1017)
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)
FAILED: loginTest
java.lang.NullPointerException
at com.ProjectName.TestCases.TC_LoginTest_001.loginTest(TC_LoginTest_001.java:14)
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:567)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:124)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:583)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:719)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:989)
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:648)
at org.testng.TestRunner.run(TestRunner.java:505)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:455)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:450)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:415)
at org.testng.SuiteRunner.run(SuiteRunner.java:364)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:84)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1208)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1137)
at org.testng.TestNG.runSuites(TestNG.java:1049)
at org.testng.TestNG.run(TestNG.java:1017)
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
Configuration Failures: 1, Skips: 0
===============================================
===============================================
Default suite
Total tests run: 1, Failures: 1, Skips: 0
Configuration Failures: 1, Skips: 0
===============================================
Expecting Automation of Login page

Answer 1

I think you forgot to instantiate the ChromeDriver like:
driver = new org.openqa.selenium.chrome.ChromeDriver();
since the driver is null you're getting an NPE on attempt to call its functions.
Check out Design Patterns - Page Object Model article which includes even a sample project you can use as the basis for your experiments.