Getting Null Pointer Exception while running a test through TestNG

Question

I am using CSV reader to fetch the data from and using this data in a test function using DataProvider.

TestNG Method

@Test(dataProvider = "regCSVData", dataProviderClass = LoginData.class)
public void testLoginUsingCSVFile(LoginData loginData){
    driver.get(appURL);
    Login login = PageFactory.initElements(driver, Login.class);
    login.loginToFwbm(loginData);
}

LoginData Class

@DataProvider(name = "regCSVData")
public static Object[][] getCSVData() throws IOException {
    CSVReader csvReader = new CSVReader(new FileReader(
            LoginData.class.getResource("/regdata.csv").getPath()));
    List<String[]>dataList = csvReader.readAll();
    Object[][]data = new Object[dataList.size()][1];
    List<LoginData> logList = new ArrayList<LoginData>();
    for (String[] strArray:dataList){
        LoginData loginData = new LoginData();
        loginData.setUserName(strArray[0].trim());
        loginData.setPassword(strArray[1].trim());
        logList.add(loginData);
    }
    for (int i=0; i<data.length;i++){
        for(int j=0;j<data[i].length;j++){
            data[i][j] = logList.get(i);
        }
    }
    csvReader.close();
    return data;
}

CSV File

asdf, pa2
qwerty, pa2
john, pa2

When I run this test using TestNG, I am getting Null Pointer exception

    java.lang.RuntimeException: java.lang.NullPointerException
        at org.testng.internal.MethodInvocationHelper.invokeDataProvider(MethodInvocationHelper.java:161)
        at org.testng.internal.Parameters.handleParameters(Parameters.java:429)
        at org.testng.internal.Invoker.handleParameters(Invoker.java:1383)
        at org.testng.internal.Invoker.createParameters(Invoker.java:1075)
        at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1180)
        at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:127)
        at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111)
        at org.testng.TestRunner.privateRun(TestRunner.java:767)
        at org.testng.TestRunner.run(TestRunner.java:617)
        at org.testng.SuiteRunner.runTest(SuiteRunner.java:334)
        at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:329)
        at org.testng.SuiteRunner.privateRun(SuiteRunner.java:291)
        at org.testng.SuiteRunner.run(SuiteRunner.java:240)
        at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
        at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
        at org.testng.TestNG.runSuitesSequentially(TestNG.java:1224)
        at org.testng.TestNG.runSuitesLocally(TestNG.java:1149)
        at org.testng.TestNG.run(TestNG.java:1057)
        at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:111)
        at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:204)
        at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:175)
    Caused by: java.lang.NullPointerException
        at com.fwbm.dataobject.LoginData.getCSVData(LoginData.java:49)
        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:84)
        at org.testng.internal.MethodInvocationHelper.invokeDataProvider(MethodInvocationHelper.java:135)
        ... 20 more

Project Structure Image

Answer 1

The best way to use QAF. In QAF, you don't need to provide implementation for parse data provider file. It is very much easy for you to use it.

You can refer documentation from QAF Data Driven

Answer 2

You have to add the file to the classPath in your "run configuration". Then the file can be loaded using getRessource();