mockito mock annotation null pointer exception

" @Test(expected = SyncException.class) MvcResults mvcResults = mockMvc.perform(get(/product).param(id, productId)).andExpect(Status().isOk()).andReturn(); I tried to do @Autowired step to since I was running into the exception of NullPointer, but it's running into exception even after that. Hope it helped. Junit test case for spring MVC with RestEasy, Spring MVC testframework fails with HTTP Response 406, Mocking a file, filewriter and csvwriter within a method for unit test throwing NullPointerException, Spring MVC application Junit test case failing, Maven dependancy with spring boot and Junit, Generating points along line with specifying the origin of point generation in QGIS. Making a mocked method return an argument that was passed to it. I was using wrong annotation/import of Mock, so my object was not getting formed. For future readers, another cause for NPE when using mocks is forgetting to initialize the mocks like so: Also make sure you are using JUnit for all annotations. Introduction to EasyMock | Baeldung Where can I find the specification/docs for the first sentence of the answer? Well in my case it was because of wrong annotation usage. Interpreting non-statistically significant results: Do we have "no evidence" or "insufficient evidence" to reject the null? Sign in I used import static reactor.core.publisher.Mono.when by accident. I didn't check it and changed a library, sorry. After removing that line from build.gradle things were started working. Additionally, it is advised not to mock classes you don't own: https://github.com/mockito/mockito/wiki/How-to-write-good-tests#dont-mock-a-type-you-dont-own We are working on improving the user experience by working on a DoNotMock feature to avoid mocking classes/methods that are known to crash Mockito internals (#1833). All the above commented codes are not required What is the symbol (which looks similar to an equals sign) called? -> at com.rosia.today.TodayPagePresenter$syncLocalOrders$2.accept(TodayPagePresenter.kt:75), As I have already mentioned on previous conversation, after debugging the code, I came to know that verifying call of function Here is a working example of DocumentRepositoryTest class for reference: DocumentRepositoryTest class is mocking documentRepository object. Can you do a draft pull request and we take a look? And there's a problem in your test code you are telling the mocked instance to return null when calling method findById(), so most probably if that was to happen, you'll get a NPE in the main code, when trying to use the .orelse() method. Undesired invocation: Did you try to remove mocks until the issue no longer occurs? IMHO using the MockitoRule is the best one, because it lets you still choose another runner like e.g. If the null hypothesis is never really true, is there a point to using a statistical test without a priori power analysis? Does a password policy with a restriction of repeated characters increase security? When calculating CR, what is the damage per turn for a monster with multiple attacks? -> at com.rosia.today.TodayPagePresenterTest.syncLocalOrders_OrderNotEmptySuccessTest(TodayPagePresenterTest.kt:67) [Solved] Mockito - NullpointerException when stubbing | 9to5Answer This will activate your @Mocks and enable the PowerMock functionality. The text was updated successfully, but these errors were encountered: We are going to need a small reproduction case for us to debug this problem. I have a class named Pinger Service which calls a HttpAdapter opening up HttpURLConnection and returning it, where getResponseCode is then called to find out if the URL was 200 or not. Presentation of the Problem. In my case, my Mockito annotation didn't match the JUnit Version. Something like Foo foo = Mockito.mock(Foo.class); when(foo.print()).thenReturn("value");. Identify blue/translucent jelly-like animal on beach. I don't think that's the correct approach. I'll add that note. You seem to mix Spring, and Mockito. The default return value of methods you haven't stubbed yet is false for boolean methods, an empty collection or map for methods returning collections or maps and null otherwise. I think that the problem is there. There are not so much diff : v3.4.6v3.5.0, but for me simple (humble, grateful ;-)) user, it is Klingon ! one or more moons orbitting around a double planet system, Two MacBook Pro with same model number (A1286) but different year. 4. IMHO using the MockitoRule is the best one, because it lets you still choose another runner like e.g. 566), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. view.hideProgressDialog(); Ed Webb's answer helped in my case. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, please write as an answer and I'll mark it. Spring testing support with override the real bean with the mock created using Mockito. Why the obscure but specific description of Jane Doe II in the original complaint for Westenbroek v. Kappa Kappa Gamma Fraternity? Problem with wiki is that you read it probably when you start with Mockito as newer. Anyway, you have eliminated enough things in your code to make it untestable, and in this process you have not included how do you call the method to be tested at all. * interface that creates problems? Not the answer you're looking for? Parabolic, suborbital and ballistic trajectories all follow elliptic paths. What's the cheapest way to buy out a sibling's share of our parents house if I have no cash and want to pay less than the appraised value? UPDATED: adding sample using spring junit runner and using spring boot's mockbean annotation. Annotate the test class with: @ExtendWith(MockitoExtension.class). if you use @Mock Annotation to Context mockContext; But it will work if you use @RunWith(MockitoJUnitRunner.class) only. Already on GitHub? Is there any known 80-bit collision attack? JUnit and Mockito Null Pointer Exception [duplicate], When AI meets IP: Can artists sue AI imitators? Generating points along line with specifying the origin of point generation in QGIS, Folder's list view has different sized fonts in different folders. In Groovy, you have meta-object protocol or MOP that allows you to use meta-programming techniques. Wanted 1 time: And what I knew was the code enters to throwable after getting Null Pointer Exception on getUnsuccessfulCallData(false, syncMessage) and the test fails Saying something like view.hideProgressDialog() wanted 1 time but was 2 times. DiscountCalculator mockDiscountCalculator = Mockito.mock(DiscountCalculator.class); #2) Mock creation with Annotations. Same problem can occur if you are using Junit5 since there is no more '@RunWith' annotation. By clicking Sign up for GitHub, you agree to our terms of service and MockitoAnnotations.initMocks(this) basically initializes objects annotated with Mockito annotations for the test class. When this class that contains this mocking is run alone that the test is green in Eclipse and maven too. This mean you should explicitly use doCallRealMethod (yourMock).when (yourMethod ()) if you want the mock's method to behave like it normally would. From first glance, I think your problem is with the Spring application context. I could confirm that have this issue too. Well occasionally send you account related emails. a GitHub project that we can run and debug. My tests work with Mockito 3.3.3, but fail with 3.6.0. When using JUnit 5 or above. This annotation is a shorthand for the Mockito.mock() method. mvn install on a whole product), then the mock is created, but is defective, e.g. Learn how your comment data is processed. Verify Method called throws Null Pointer exception. As we solved it by rewrite unfinished feature. I know I should not be testing void methods like this, but I am just testing Mockito.doNothing () as of now with a simple example. }, @RunWith(MockitoJunitRunner.class) Has anyone been diagnosed with PTSD and been able to get a first class medical? Having the same problem using Junit 5 , I resolve it using : @ExtendWith(MockitoExtension.class) instead of @RunWith(MockitoJUnitRunner.class) . Here is a sample of what I think you could do if you are using mockito only and dont need to instantiate a spring container (used a single class for ease of example dont do this in actual code): If you need an example via Spring using MockBean or without and dependencies, let me know and I can post. Is there a generic term for these trajectories? So I had: I have no idea why that produced a NullPointerException. @Mock mockito - NullPointerException when calling a mocked method - Stack For me it looks like that after the test with mocked Final class isn't correctly released and next tests instead of call of original java.lang.reflect.Method type calls it on mock. Connect and share knowledge within a single location that is structured and easy to search. Don't forget to annotate your Testing class with @RunWith (MockitoJUnitRunner.class). Has anyone faced the same issue? Here is a list of 3 things you should check out. Does anyone know why this behaviour happens when the method is not "open" ? So instead of when-thenReturn , you might type just when-then. Your tests are making large assumptions that they have each object (non null) returned from the previous call. Based on above suggestion https://stackoverflow.com/a/55616702/2643815. But I mocked the consumer, why is it throwing null pointer exception and I should be skipping over that method, right? Using Spring Boot @SpyBean - Shekhar Gulati It doesnt work for me always gives this error "dexcache == null (and no default could be found; consider setting the 'dexmaker.dexcache' system property)". How do you test that a Python function throws an exception? Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey. You will have to adapt to your environment/configuration. In my case i forgot to initialize my variables effectively THANK YOU !! java.lang.NullPointerException: Cannot invoke "org.springframework.http.ResponseEntity.getStatusCodeValue()" because the return value of "com.learnit.testing.MyController.getUser(java.lang.Long)" is null. Thanks for contributing an answer to Stack Overflow! @TimvdLippe : In my case I am mocking the spring-beans org.springframework.beans.factory.BeanFactory interface: BeanFactory beanFactory = mock(BeanFactory.class); If I run the test class by itself, then the mock is successful. Null pointers from a mock object? Newbie question. - Google Groups Can corresponding author withdraw a paper after it has accepted without permission/acceptance of first author, Folder's list view has different sized fonts in different folders, Extracting arguments from a list of function calls. 566), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. parentFeedReader.pullAndProcessAllFeeds(); Eigenvalues of position operator in higher dimensions is vector, not scalar? Apologies for the uninformative exception that is thrown. } of the mocked class would not be executed. Null Pointer exception passed by test method, Mockito junit testing not working- beans mocked by @mockBean are null, Mockito Null Pointer Exception and Unfinished stubbing detected, Spring Boot JUnit test beanFactory.getBean null pointer exception, Folder's list view has different sized fonts in different folders, the Allied commanders were appalled to learn that 300 glider troops had drowned at sea. This might not be a viable solution for everyone, but hopefully knowing the root cause will help someone. @tendomart I dont think it needs any class from atomfeed mocked since I am not even using it in the class that am testing. This answer doesn't solve OP's issue but since this post is the only one that shows up on googling this issue, I'm sharing my answer here. Mockito - Exception Handling - TutorialsPoint ClientError: GraphQL.ExecutionError: Error trying to resolve rendered. Not the answer you're looking for? What does 'They're at four. 2. Debug and check if you are returning something. I get an NPE when I run the exact code on my IDE. My issue was that I was trying to mock an object which was final in my service. log.info(bad product id..); { Null pointer exception when using Mockito to mock interface. Not sure how, since each test ran separatelly is fine and I can't tell which one, when all the suite is ran, creates some sort of corruption, since the @Origin Method invokedMethod is injected as some broken object. privacy statement. MockitoJunitRunner will you create a Mock object based on the type you demand StockService in your guess. Null Pointer Exception When Mocking Method With No Parameters - Github However, maybe you want to @RunWith(SpringRunner.class) as the SpringRunner provides support for loading a Spring Application Context and having beans @Autowired into your test instance. Getting a null pointer exception when invoking a method on a mock. When you want to use the @Mock annotation you should use the MockitoJUnitRunner. Why refined oil is cheaper than cold press oil. I fallowed above rules correctly. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. IMHO you need to add a @RunWith(some.mockito.TestSuiteIDontRememberName.class) annotated to the test class. This other SO question is more specifically about that, but you'd miss it when you don't know the issue is with value classes. Did the drapes in old theatres actually say "ASBESTOS" on them? Well occasionally send you account related emails. I used anyString() and anyBoolean() instead of any() and test passed . 566), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. public class StockController{ First you dont need both @RunWith(MockitoJUnitRunner.class) and MockitoAnnotations.initMocks(this); at the same time. To solve this, you can use the @InjectMocks annotation instead of = new CustomerProfileService (customerProfileRepository); Alternatively, you can manually create the spied service in the before/beforeEach . Is there such a thing as "right to be heard" by the authorities? 3. I have a class: open class Foo(private val bar: Bar) { fun print(): String { return bar.print() } } When I mock this class in java, I get a null pointer exception. To learn more, see our tips on writing great answers. In my case, Intellij created Test with org.junit.jupiter.api.Test (Junit5) instead of import org.junit.Test of (Junit4) which caused all beans to be null apparently. One option is create mocks for all intermediate return values and stub them before use. Mockito.when(parentFeedReader.enabled()).thenReturn(false); Sign in This is especially true for any class in java.lang.reflect. Find centralized, trusted content and collaborate around the technologies you use most. This can be done in qn @Before method, in your own runner or in an own rule. Do this for all the mocks you are creating. 566), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. You are instantiating a new service Service service = new Service(); but from what I can see you are never injecting the mock bean into the new service. If I were you, I'd first try to initialize the mocked instances in a @Before method and see if the test runs then, I'd read the Mockito (sorry, but I normally use EasyMock) library documentation, and check how is the @Mock annotation used (I can tell you you have chances for this to be the problem). Because I assume that the field to mock is never mocked. How do you assert that a certain exception is thrown in JUnit tests? Conclusion. also, make sure the class and test method is public. Somehow, Intellij assumed I want to use, I somehow missed this line "MockitoAnnotations.initMocks(this); ". And so the dependencies inside the MyClass remained null causing a null reference exception to be thrown once used. When calculating CR, what is the damage per turn for a monster with multiple attacks? *, as Mockito has to make extensive use of reflection to function correctly. two layers of mocks). @Mock First, let's define a Spring component with an empty doWork method: @Component public class MyComponent { public void doWork() {} } Then, let's define our service class. Criteria Query Mockito unit test - NullPointerException. @InjectMocks annotation on the service? Asking for help, clarification, or responding to other answers. The main issue here is whenever I try to run the test syncLocalOrders_OrderNotEmptySuccessTest(), the code enters to both subscribe and throwable of fun syncLocalOrders(syncOrders: SyncOrders) (this was got by keeping breakpoints.) You need to annotate the mocking object with the @Mock annotation. Did the drapes in old theatres actually say "ASBESTOS" on them? (adsbygoogle = window.adsbygoogle || []).push({}); Your email address will not be published. Turns out I hadn't included the maven-surefire-plugin in my pom.xml and that meant the @ExtendWith wasn't actually doing anything! Appreciate the response, I think the problem was I was using it in JUnit Test and while some code merges someone from team mistakenly added dex maker testImplementation dependencies. Why did DOS-based Windows require HIMEM.SYS to boot? Where does the version of Hamapil that is different from the Gemara come from? Product pr = new Product(); Help for visitors to this question: Make sure you haven't accidentally got. Mockito class javadoc where is enumeration of features. @InjectMocks +1 for the "make sure your are using JUnit for all annotations"! rev2023.5.1.43405. It's a simple matter of checking each object returned to see which one is null. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. MockitoExtension does not have a callback for @BeforeAll. Try to to check if the method that you are calling is a final method or not. "This worked for me. Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey, Mock and InjectMocks return NullPointerException, Spring @Autowired field is null when running Mockito test. Asking for help, clarification, or responding to other answers. P.S You need to think which class you actually want to test, that determines which instances should be mocked. Much love! Two MacBook Pro with same model number (A1286) but different year. You have to inject the class annotated with @Mock Does a password policy with a restriction of repeated characters increase security? getUnsuccessfulCallData(false, syncMessage) throws Null Pointer Exception which is inside subscribe of fun syncLocalOrders(syncOrders: SyncOrders). Sign up for a free GitHub account to open an issue and contact its maintainers and the community. There are two solutions: Use deep stubbing: ValueProducerFactory valueProducerFactory = Mockito.mock(ValueProducerFactory.class, Mockito.RETURNS_DEEP . I hope this helps. I was getting errors that made no sense but using Mockito.anyInt() rather than Mockito.any() solved it. By clicking Sign up for GitHub, you agree to our terms of service and Just note that your example code seems to have more issues, such as missing assert or verify statements and calling setters on mocks (which does not have any effect). I know I should not be testing void methods like this, but I am just testing Mockito.doNothing() as of now with a simple example. 566), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. Has anyone been diagnosed with PTSD and been able to get a first class medical? Wondering if it is the version of mockito: Ok - figured it out - it is because the method is final. I see that when the, When AI meets IP: Can artists sue AI imitators? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. What I use is JUnit and Mockito. in an @BeforeEach setup. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Worked example; To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Well occasionally send you account related emails. The most likely candidate for the regression is probably #2004 @raphw does this exception ring any bells? What positional accuracy (ie, arc seconds) is necessary to view Saturn, Uranus, beyond? Cache cache = mock (Cache.class); when (cache.get (anyObject ())).thenReturn (null); I get a null pointer exception when cache.get tries to access the. So, first we should mock a parameter, for instance. Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey, Spring Controller Testing using Mockito , Null Pointer Exception, Mockito Test With java.lang.NullPointerException. java mockito nullpointerexception unit-testing. Thank you very much! Today, I shared 3 different ways to initialize mock objects in JUnit 5, using Mockito Extension ( MockitoExtension ), Mockito Annotations ( MockitoAnnotation#initMocks ), and the traditional Mockito#mock . All the above commented codes are not required { mockContext = Mockito.mock(Context.class);}, if you use @Mock Annotation to Context mockContext; @Mock Context mockContext; But it will work if you use @RunWith . Making statements based on opinion; back them up with references or personal experience. This object is unboxed to an integer, so the generic type is determined to be 'Integer'. But for sure, NullPointerException happened because you want something which is not there. In my case a tested method called another method as a parameter: While repository is mocked, prefs.getUser().id) will throw NPE. It's important to note that we should only use it in a test class. Sorted by: 1. Is it a basically misunderstanding from my side, or is there something else wrong? How do the interferometers on the drag-free satellite LISA receive power without altering their geodesic trajectory? However, questions do not belong in answers, which is why I've removed it. The solution was to change the annotation from @BeforeAll to @BeforeEach. None of these answers worked for me. However I discarded my changes after noticing i was implementing something already presentI corrected it and PR is https://github.com/openmrs/openmrs-module-sync2/pull/149. Most of the people just forget to specify the test runner, running class for mocking. Your tests are making large assumptions that they have each object (non null) returned from the previous call. You have three options for activating the @Mock annotation: MockitoRule, MockitoJUnitRunner, MockitoAnnotations.initMocks(this). Add a text file to the project's src/test/resources/mockito-extensions directory named org.mockito.plugins.MockMaker and add a single line of text: After that, mocking the final method should work just fine. (Ep. Asking for help, clarification, or responding to other answers. This is where google took me when I had the same NullPointerException with Junit 5, but was correctly using @ExtendWith(MockitoExtension.class) in my maven project. FYI: I am using following versions of Gradle dependencies: Your repository instance is mocked and thus will return null for all unstubbed method calls. Could a subterranean river or aquifer generate enough continuous momentum to power a waterwheel for the purpose of producing electricity? rev2023.5.1.43405. Find centralized, trusted content and collaborate around the technologies you use most. Mockito : how to verify method was called on an object created within a method? }, NOTE: just exclude if any syntax exceptions it might be my typing mistakes. Find centralized, trusted content and collaborate around the technologies you use most. I am running through the same problem again. To fix this, I was able to just replace AppCompatActivity with Activity since I didn't really need it.

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