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. Learn how your comment data is processed. java - JUnit and Mockito Null Pointer Exception - Stack Overflow Is "I didn't think it was serious" usually a good defence against "duty to rescue"? Sign in Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey. This one catches out a lot of people who work on codebases which are subjected to Checkstyle and have internalised the need to mark members as final. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. I tried all the suggestions that you have mentioned but couldn't solve the issue. Maybe it was IntelliSense. Why don't we use the 7805 for car phone chargers? JUnit and Mockito Null Pointer Exception [duplicate], When AI meets IP: Can artists sue AI imitators? This is clearly related to Mockito and my spring beans not being injected correctly. privacy statement. 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. Where might I find a copy of the 1983 RPG "Other Suns"? }, NOTE: just exclude if any syntax exceptions it might be my typing mistakes. So I started writing tests for our Java-Spring-project. I am using JUnit version 4 and i still needed "@RunWith(MockitoJUnitRunner.class)" annotation for "when" method to work properly. Based on above suggestion https://stackoverflow.com/a/55616702/2643815. [mockito] NullPointerException thrown when mocking Groovy class But I want to use when()..thenReturn() to get around creating this variable and so on. In the following example, we'll create a mocked ArrayList manually without using the @Mock annotation: @Test public void whenNotUseMockAnnotation_thenCorrect() { List . I'm learning and will appreciate any help, A boy can regenerate, so demons eat him for years. The text was updated successfully, but these errors were encountered: You should use doReturn/when construct instead of whenever/thenReturn. { Thank you for your help to point the real error. } view.hideProgressDialog(); Have a question about this project? If a caller passes null in some parameter for which null values are prohibited, convention dictates that . Asking for help, clarification, or responding to other answers. after all the above failed this import was the one which worked. By clicking Sign up for GitHub, you agree to our terms of service and Do this for all the mocks you are creating. To learn more, see our tips on writing great answers. Mockito : how to verify method was called on an object created within a method? Please create a small reproduction case, e.g. I get a crash when I mock a method in an interface that doesn't take any parameters. Already on GitHub? In the Maven/Gradle build tool, if you set to use testRuntimeOnly 'junit5',then it might not take @RunWith since it is not available and it is replaced with @ExtendWith in Junit5. *, as Mockito has to make extensive use of reflection to function correctly. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Then as if by magic, it started working for me. In this article, we explored how to configure method calls to throw an exception in Mockito. rev2023.5.1.43405. It's important to note that we should only use it in a test class. IMHO using the MockitoRule is the best one, because it lets you still choose another runner like e.g. How do you assert that a certain exception is thrown in JUnit tests? Also when I try to mock another method from an object: There I also get a Nullpointer, because the method needs a variable, which isn't set. 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). When to use LinkedList over ArrayList in Java? Which language's style guidelines should be used when writing code that is supposed to be called from another language. Null pointers from a mock object? Newbie question. - Google Groups Mockito.doNothing () keeps returning null pointer exception. This will activate your @Mocks and enable the PowerMock functionality. I tried different version. And most likely very trivial. Mockito test a void method throws an exception. Unfortunately, Method is one of the classes that Mockito relies on internally for its behavior. "Signpost" puzzle from Tatham's collection. Creating Mocks and Spies in Mockito with Code Examples Sign in Identify blue/translucent jelly-like animal on beach. Debug and check if you are returning something. Dont forget to annotate your Testing class with @RunWith(MockitoJUnitRunner.class). You might get NullPointerException exception when you try to mock object in your tests. * no. privacy statement. Why don't we use the 7805 for car phone chargers? For Mockito, there is no direct support to mock private and static methods. I came across this issue while writing unit tests for Android. } Undesired invocation: the object in when() must be a mock created by Mockito.mock(), it does not work for manually created real objects - not sure if that's your issue, since I'm not really getting where your problem is Added some code. one or more moons orbitting around a double planet system, Two MacBook Pro with same model number (A1286) but different year. Specify Mockito running class. Canadian of Polish descent travel to Poland with Canadian passport. Alright thought the class youre mocking had dependencies on the former. I am attempting to mock HttpURLConnection and make getResponseCode return a 404, however I am getting a Null Pointer Exception. So for everyone else landing on this page in the future, try your best to find in your code mocking of java.lang.reflect.Method and address those tests. I needed to tell the spring boot test where to look for the beans required for the example. The reason why is that any() returns a generic object reference. We don't need mock this class now. ClientError: GraphQL.ExecutionError: Error trying to resolve rendered. None of these answers worked for me. When calculating CR, what is the damage per turn for a monster with multiple attacks? document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. What solved this issue for me (combination of answers above and my own additions): When doing command + N --> Test in Intellij it generates (as a default at least) some boilerplate that did not work in my case. Null Pointer Exception When Mocking Method With No Parameters - Github I'll try to do one next week, after I return from vacation, but, in the meantime, I've commented out tests one-by-one, until I discovered what triggers the problem. One of them has a Mockito.mock(Method.class). Also note, I just created a dummy Consumer class cause I did not have the actual class in my environment, Is there a way to run this with SpringJUnit4ClassRunner.class. To learn more, see our tips on writing great answers. As this is the closest I found to the issue I had, it's the first result that comes up and I didn't find an appropriate answer, I'll post the solution here for any future poor souls: any() doesn't work where mocked class method uses a primitive parameter. Apr 25, 2016 at 18:45. As for the error occuring when not mocking core classes. 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. @pyus13 This should be a new question with more code. Your email address will not be published. ', referring to the nuclear power plant in Ignalina, mean? Ubuntu won't accept my choice of password. To learn more, see our tips on writing great answers. 3. I also notice that DAO was null so I did this(Just to mention, I did the below step to try, I know the difference between springUnit and Mockito or xyz): How do I mock external method call with Mockito. Mockito: 3 Ways to Init Mock in JUnit 5 - Mincong Huang Am just thinking , do you have atom feeds started ? In you're example when (myService.getListWithData (inputData).get ()) will cause a NullPointerException because . NullPointerException when using Mockito - OpenMRS Talk When I pass from mockito(-jupiter) 3.4.6 to 3.5.0 everything goes wrong. Already on GitHub? a GitHub project that we can run and debug. Two MacBook Pro with same model number (A1286) but different year, "Signpost" puzzle from Tatham's collection. MockitoExtension does not have a callback for @BeforeAll. You signed in with another tab or window. in testing class it mocked object is mocking perfectly but when it goes to corresponding class that mocked reference is becoming null. Thanks for contributing an answer to Stack Overflow! Thanks for contributing an answer to Stack Overflow! 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. Where does the version of Hamapil that is different from the Gemara come from? recording its expected behavior, including the action, result, exceptions, etc. 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. Sorted by: 1. @InjectMocks annotation on the service? Null pointer exception when using Mockito to mock interface. Original implementation is changed in the meantime and we don't mock java.lang.reflect. It's a simple matter of checking each object returned to see which one is null. My tests work with Mockito 3.3.3, but fail with 3.6.0. You signed in with another tab or window. @InjectMocks It is stored in surefire reports directory. rev2023.5.1.43405. If not share your stack trace as well as the code you are running. Does a password policy with a restriction of repeated characters increase security? our application uses JUNIT5 , same issue occured. In my case i forgot to initialize my variables effectively THANK YOU !! Which language's style guidelines should be used when writing code that is supposed to be called from another language? I'll add that note. In you're example when(myService.getListWithData(inputData).get()) will cause a NullPointerException because myService.getListWithData(inputData) is null - it has not been stubbed before. Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey. 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). It's a simple matter of checking each object returned to see which one is null. @Service public class Service { @Autowired private Consumer<String, String> kafkaConsumer; public void clearSubscribtions () { kafkaConsumer.unsubscribe every thing is fine just getting NullpointerException. Is it safe to publish research papers in cooperation with Russian academics? In my case, my Mockito annotation didn't match the JUnit Version. Horizontal and vertical centering in xltabular. 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. When you want to use the @Mock annotation you should use the MockitoJUnitRunner. I don't think that's the correct approach. I had the problem that I declared @Mock MyClass myClass and then tried to mock a behaviour inside my @BeforeAll annotated method: Apparently init() was executed before the mock initialization of myClass, so myClass == null inside init(). The code above mocks the constructor of DBConnectionManager class and returns a mocked object of DBConnectionManager. How to force Unity Editor/TestRunner to run at full speed when in background? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. java - Mockito NullPointerException - Stack Overflow I see that when the, When AI meets IP: Can artists sue AI imitators? This doesnt answer the OP's original query, but its here to try help others with Mockito null pointer exceptions (NPE). What is a NullPointerException, and how do I fix it? * is unsupported, as Mockito itself is based on these classes. 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. Mockito.when(httpAdapter.createHttpURLConnection("devnews.today")).thenReturn(mockHttpURLConnection); Website website = pingerService.ping("http://devnews.today"); Hence at runtime HttpUrlConnection is actually null wthe default return value for mocks, Instead of @Autowire on PingerService use @InjectMocks, Then, (since you are using SpringJUnit4ClassRunner.class) add a method annotated with @Before. 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. The NPE happens at @InjectMocks annotation which means the mock framework is not able to find some mocks to inject during . Wondering if it is the version of mockito: Ok - figured it out - it is because the method is final. 3. Unlike the mock() method, we need to enable Mockito annotations to use this annotation.. We can do this either by using the MockitoJUnitRunner to run the test, or by calling the MockitoAnnotations.initMocks() method explicitly. P.S You need to think which class you actually want to test, that determines which instances should be mocked. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. We'll also explain how to fix the problem. NullPointerException when mocking more than one static method - Github Try to to check if the method that you are calling is a final method or not. Most likely, you mistyped returning function. By using @Mock annotation this giving a build failed. Probably you don't know what to return, or you need to return an also mocked object instance but as such, it is impossible to repair your code without implementing something completely different to your intention. I don't know what's wrong, but it says that, One of them is enough for use @mock annotation, Thank you for answering! Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Why are you mocking something that you're autowiring? Is there a generic term for these trajectories? Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey, Mockito matchers, scala value class and NullPointerException, NullPointerException: Testing DAO class that uses Ebean with Mockito and JUnit, Kotlin, Getting a null pointer exception when using when().thenreturn() in mockito, Mockito NoSuchElementException when() findById() get() thenReturn(), Mockito + JUnit test returns a NullPointerException, In the unit test of TestNG, nullPointerException is always reported when using the mokito stub function, I did not find a solution, Mockito returning null: Multiple external dependencies that needed to be mocked, The find() method of the EntityManager class returns NULL during the Mockito test UnitTest. 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. @Mock What does 'They're at four. 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. How to verify that a specific method was not called using Mockito? Can anybody tell me what am I doing wrong? What positional accuracy (ie, arc seconds) is necessary to view Saturn, Uranus, beyond? Maybe this will help the next poor soul. For example, to mock a function that takes a primitive long as parameter, instead of using any(), you should be more specific and replace that with any(Long.class) or Mockito.anyLong(). mvn install on a whole product), then the mock is created, but is defective, e.g. If you want to mock an object, you need to annotate the object with @Mock annotation. IMHO you need to add a @RunWith (some.mockito.TestSuiteIDontRememberName.class) annotated to the test class. You should read the Javadoc of Mockito.RETURNS_DEEP_STUBS which explains this in more detail and also has some warnings about its usage. I hope it helps. Product product = optional.get(); * interface that creates problems? The issue I have is that the code stops working when I static-mock more than one method in my code. There's a limitation in Mockito-kotlin verifying non-null parameters - it's mentioned in the wiki. Thank you very much! Where can I find the specification/docs for the first sentence of the answer? In most of the test classes @RunWith(MockitoJUnitRunner.class) works fine in injecting mocks. @BeforeEach helped me here but it always depends on execution context. I've replicated the same conditions in a unit test with robolectric and that problem doesn't exist. FYI: I am using following versions of Gradle dependencies: Your repository instance is mocked and thus will return null for all unstubbed method calls. When generating a mock, we can simulate the target object, specify its behavior, and finally verify whether it's used as expected. What do hollow blue circles with a dot mean on the World Map? "This worked for me. This worked for me. How do you assert that a certain exception is thrown in JUnit tests? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. For me, it was because I was stubbing the mock in the @BeforeAll method. I am trying to write a unit test in JUnit with Mockito however am geting a NPE when I inject-mockshere is the Unit test https://github.com/openmrs/openmrs-module-sync2/commit/3dec2022a0d5058c45fce3f9abdc106ce0b8c833 How do you test that a Python function throws an exception? 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? to your account. You are running a Mock test with @RunWith(MockitoJunitRunner.class). Yes I did, But getting same error Null Pointer Exception. Example Error: Thanks !!! Why did DOS-based Windows require HIMEM.SYS to boot? The @Mock annotation requires a test suite that searches for the annotation and gathers the information to inject the values there. java - Null Pointer Exception JUnit Mockito - Stack Overflow Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Just a note, I consider it very bad style to let a service return a, and are also the mock instances injected into the test clases with the, How to create a Minimal, Reproducible Example, When AI meets IP: Can artists sue AI imitators? in an @BeforeEach setup. I've managed to make a reproducer Not the answer you're looking for? Mockito - NullpointerException when stubbing Method If you don't control the source you're mocking, you can get around it using, Mockito - NullpointerException when stubbing Method, stackoverflow.com/help/minimal-reproducible-example, static.javadoc.io/org.mockito/mockito-core/2.20.0/org/mockito/, github.com/mockito/mockito/blob/v2.20.0/src/main/java/org/, When AI meets IP: Can artists sue AI imitators? Instead of mocking using static 'mock' method of Mockito library, it also provides a shorthand way of creating mocks using '@Mock . @TimvdLippe In my case I'm mocking also my own classes and get the same NPE. There is mentioned that some of aren't supported. If you're using Scala and you try to create an any matcher on a value class, you'll get an unhelpful NPE. Find centralized, trusted content and collaborate around the technologies you use most. Does the order of validations and MAC with clear text matter? MvcResults mvcResults = mockMvc.perform(get(/product).param(id, productId)).andExpect(Status().isOk()).andReturn(); What does 'They're at four. @dkayiwa. Mockito.doNothing () keeps returning null pointer exception Worked example; To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Because I assume that the field to mock is never mocked. It can cover both Constructor injected & Field injected dependencies. What's the difference between a mock & stub? UPDATED: adding sample using spring junit runner and using spring boot's mockbean annotation. edited 17 Oct, 2020. . Should I re-do this cinched PEX connection? So you are running your test and suddenly you see NullPointerException: You looked it up, and it seems your test is written correctly. Also ran into this issue when upgrading from Mockito 3.3.3 to Mockito 3.6.0 (from spring-boot 2.3.6 to 2.4.0). To subscribe to this RSS feed, copy and paste this URL into your RSS reader. It was working before but I understand that it is not a good practise. Do I need to mock the request that I have done inside getUnsuccessfulCallData(showDialog: Boolean, syncMessage: String ) to verify the method? When I run the below code, I get, Therefore, I would be inclined to close this issue as WontFix, unless @nguyenquoc you are mocking a non-java.lang. call, which is null because you haven't mocked it yet. Just find what was problem. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. 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. My issue was that I was trying to mock an object which was final in my service. Mockito - Exception Handling - TutorialsPoint 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. But was 2 times. You need to instantiate the routingClientMock e.g. 2. Much love! Figured out what was wrong, I needed to auto wire the service. return new GatewayResponse(HttpStatus.Ok,product, Message.SUCCESS.getDesc()); Any pointers on what i should do? Joshua bloch in effective java says that "Arguably, all erroneous method invocations boil down to an illegal argument or illegal state, but other exceptions are standardly used for certain kinds of illegal arguments and states. private variable 'status' which is null. of the mocked class would not be executed. What is this brick with a round back and a stud on the side used for? -> at com.rosia.today.TodayPagePresenterTest.syncLocalOrders_OrderNotEmptySuccessTest(TodayPagePresenterTest.kt:67) (Ep. mvn install on a whole product), then the mock is created, but is defective, e.g. Yes, indeed, now I found one mock of the Method which indeed the culprit. However, questions do not belong in answers, which is why I've removed it. 1 Answer. In order to test private methods, you will need to refactor the code to change the access to protected (or package) and you will have to avoid static/final methods. Your tests are making large assumptions that they have each object (non null) returned from the previous call. Please review the below code: updateUser() method verification throws Null Pointer Exception. i declared MockMvc object also bt didnt mension here, when debugging in StockController i am getting null pointer Exception in -> if (optional.isPresent()). DiscountCalculator mockDiscountCalculator = Mockito.mock(DiscountCalculator.class); #2) Mock creation with Annotations. Also we should mock prefs. Find centralized, trusted content and collaborate around the technologies you use most. So what might be a problem if you know how the mocking works? After removing that line from build.gradle things were started working. 5. If I run the test class in a suite of tests (e.g. The test itself, ran by itself, works but if the whole suite is ran, some tests that follow it get the problem described above. one or more moons orbitting around a double planet system, Ubuntu won't accept my choice of password, What are the arguments for/against anonymous authorship of the Gospels. You have three options for activating the @Mock annotation: MockitoRule, MockitoJUnitRunner, MockitoAnnotations.initMocks(this). 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. Making a mocked method return an argument that was passed to it. It allows you to mock a specific bean in the dependency graph. Not the answer you're looking for? 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. I got null pointer bcoz of @RunWith(PowerMockRunner.class), instead of that I changed to @RunWith(MockitoJUnitRunner.class). Have a question about this project? What is the current status? privacy statement. Break even point for HDHP plan vs being uninsured? In our example, it is the testClass instance annotated with @InjectMocks.This line will search for any mocked dependencies for testClass instance & inject them properly. Does a password policy with a restriction of repeated characters increase security? I moved the stubbing inside the test method it worked!! Mockito.when(parentFeedReader.enabled()).thenReturn(false); if (optional.isPresent()) { What would help is to perform a bisect of Mockito versions to figure out which specific PR is causing issues. Spy. The object is null though, so the unboxing fails accessing a null pointer. When using JUnit 5 or above. He also rips off an arm to use as a sword. Conclusion. Making statements based on opinion; back them up with references or personal experience. Parameterized. ', referring to the nuclear power plant in Ignalina, mean? That's a good remark, Ridcully. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. 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 was using org.evosuite.shaded.org.mockito.Mock and I switched back to org.mockito.Mock. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Connect and share knowledge within a single location that is structured and easy to search. Is "I didn't think it was serious" usually a good defence against "duty to rescue"? pr.setName(buhbdf); Verify Method called throws Null Pointer exception. #271 - Github Can Mockito capture arguments of a method called multiple times? test.zip. 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). Introduction to EasyMock | Baeldung Check your imports, based on the usage of. Can corresponding author withdraw a paper after it has accepted without permission/acceptance of first author. getUnsuccessfulCallData(false, syncMessage) throws Null Pointer Exception which is inside subscribe of fun syncLocalOrders(syncOrders: SyncOrders). For JUnit 5 the test class has to be annotated with: you need to initialize MockitoAnnotations.initMocks(this) method has to called to initialize annotated fields. First you don't need both @RunWith (MockitoJUnitRunner.class) and MockitoAnnotations.initMocks (this); at the same time. 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. Is there such a thing as "right to be heard" by the authorities? - ManoDestra. @tendomart I dont think it needs any class from atomfeed mocked since I am not even using it in the class that am testing. I had this issue and my problem was that I was calling my method with any() instead of anyInt(). Mockito : how to verify method was called on an object created within a method? when(stockService.getProduct(productId)).thenReturn(Optional.of(product)); How to verify that a specific method was not called using Mockito? The use case of @MockBean is integration test cases.