null pointer exception while running unit test

[irshad irshadoz]

Hello,

i am running my unit test but for some reason i am getting a null pointer on this line

<br /> messageSource.getMessage("login.user.fail", new String[" cols="60" rows="10"> { "a", "b" }, request.getLocale())); ]

Please find below the method that my unit test will be based on:

@Controller
public class LogInController {

@Autowired
	UserManagerService userManagerService;
@RequestMapping(method = RequestMethod.POST, value = "/login")
	public ModelAndView validateViewLogin(@ModelAttribute Person person,
			BindingResult result, HttpServletRequest request) {
		ModelAndView mav = new ModelAndView();

		String userName = person.getFirstName();
		String password = person.getPassword();
		boolean isUserValid = false;
		if (userName != null && password != null) {

			isUserValid = userManagerService.validateUserLogin(userName,
					password);

		}
		if (!isUserValid) {

			mav.addObject(
					"failLog",
					messageSource.getMessage("login.user.fail", new String[] {
							"a", "b" }, request.getLocale()));

			 mav.addObject("isUserValid", false);

			 mav.setViewName("login");
			 return mav;
		}

Please find below my unit test:

@Test
	public void validateViewLogin_NotValidLogin_returnsLoginPage() {
		MockHttpServletRequest request = new MockHttpServletRequest();
		Person person = new Person();
		person.setFirstName("John");
		person.setPassword("123");
		isUserValid = false;
		LogInController controller = new LogInController();

		// Inject mock user service into controller
		UserManagerService mockUserService =   mock(UserManagerService.class);
		controller.setUserManagerService(mockUserService);

		// Configure mock user service to accept the person
		when(mockUserService.validateUserLogin("John", "123")).thenReturn(
				isUserValid);

		// Attempt the validation
		ModelAndView mav = controller
				.validateViewLogin(person, result, request);

		// Check the result
		assertEquals("login", mav.getViewName());
	}

Please see stack trace below:

java.lang.NullPointerException
	at com.gemstone.presentation.LogInController.validateViewLogin(LogInController.java:100)
	at com.gemstone.presentation.LogInControllerTest.validateViewLogin_NotValidLogin_returnsLoginPage(LogInControllerTest.java:79)
	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.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
	at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

line 100 for my loginController is shown below:

	messageSource.getMessage("login.user.fail", new String[] {

I am assuming that i need to mock message source. If this is the cause of my exception, how can i mock the messagesource in my unit test please?

However when i run my application it works fine no null pointer, its only when i run the unit test that i get the null pointer exception.

Thanks in advance.

[Jeanne Boyarsky]

Where is messageSource defined? I don't see it as an instance variable, parameter or local variable.