Question

I have following class:

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={"classpath:/com/home/app/Home-ctx.xml"})
public class LoginDetailsTest  {

    public static void main(String[] args) {
        new LoginDetailsTest().testLoginDetails();
    }
    @Inject
    @Named(HomeConstants.loginDetailsService)
    private LoginDetailsService loginDetailsService;
    private List<UserLogin> loginDetails;

    @Test
    public void testLoginDetails() {
        UserLogin login = new UserLogin();
        login.setLoginName("test");
        login.setLoginPassword("test123");
        loginDetails = loginDetailsService.loginDetails(login);
        for (UserLogin loginDet : loginDetails) {
            System.out.println(loginDet.getLoginName());
            System.out.println(loginDet.getLoginPassword());
        }
    }
}

if i run above code as junit test, then it gives expected result.
If I run as Java application ie main method, then it gives null pointer exception for
loginDetailsService.loginDetails(login). how can run as main method without error?

Answer 1

You still need to do what JUnit does when you “run code as junit test” to bootstrap your application context and dependency injection:

public static void main(String[] args) {
    org.junit.runner.JUnitCore.run(LoginDetailsTest.class);
}