Clash Royale CLAN TAG

Error while executing Selenium script - java.lang.NullPointerException - TestNG

I'm trying to run a script via testNG. But getting java.lang.NullPointerException. I have put in the driver initialisation code in BeforeMethod and rest of the code under Test. Please let me know what's wrong in my script due which Im getting the error.Thanks in Advance.

My Script:

public class NewTest {

WebDriver driver = null;
@BeforeMethod
public void beforeMethod() {

System.setProperty("webdriver.chrome.driver", Constants.Chrome_Driver);

WebDriver driver = new ChromeDriver();

driver.manage().window().maximize();

driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);

driver.get("http://" + Constants.auth_Username + ":" + Constants.auth_Password + "@" + Constants.URL);
}

@Test
public void f() throws InterruptedException {

actions.Admin_Login.txbx_aUsername(driver).sendKeys(Constants.aUsername);

actions.Admin_Login.txbx_aPassword(driver).sendKeys(Constants.aPassword);

actions.Admin_Login.btn_login(driver).click();

actions.create(driver).click();

Actions action = new Actions(driver);
action.moveToElement(actions.create.list(driver)).build().perform();

//Create a Course Category

actions.create_list.list_category(driver).click();

actions.create_list.list_ceate_category(driver).click();

actions.create_list.txtbx_Cat_tile(driver).sendKeys(Constants.list_title);

actions.create_list.btn_Cat_Save(driver).click();

System.out.println("List Created Successfully");
}

}


I am using PageObjects to get the data. This script is running fine without testNG. But when I convert the test into testNG and execute, it throws error.

Error I am facing:

java.lang.NullPointerException
at actions.Admin_Login.txbx_aUsername(Admin_Login.java:13)
at testScripts.NewTest.f(NewTest.java:43)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:124)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:580)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:716)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:988)
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:114)
at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:251)
at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:77)


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