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

enter image description here

I've put the csv file under project name... so it is coming directly under project name...it isn't kept inside any folder... so I am directly using it name to refer it. — Paras, May 26 '14 at 13:25
even I think, it is not able to find regdata.csv but I didn't understand why? :( ... I've added the image of project structure as well... if it helps. — Paras, May 26 '14 at 13:26
this file must be added to the classpath. Is it in the classPath? — Jens, May 26 '14 at 13:30
No, its not there in classpath.. how do I add it? and why do we need to add it in classpath... .can't we directly use it? — Paras, May 26 '14 at 13:31
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/54452/discussion-between-jens-and-paras). — Jens, May 26 '14 at 13:31
@pArAs what if you'll try `getResource("regdata.csv")`, without slash — nikis, May 26 '14 at 13:32

score 1 · Accepted Answer · answered May 26 '14 at 13:38

1

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

answered May 26 '14 at 13:38

Jens

67,715
15
98
113

score 1 · Answer 2 · answered Oct 28 '16 at 09:23

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

answered Oct 28 '16 at 09:23

bangoria anjali

400
1
10

Getting Null Pointer Exception while running a test through TestNG

2 Answers2