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? Making statements based on opinion; back them up with references or personal experience. Getting a null pointer exception when invoking a method on a mock I needed to tell the spring boot test where to look for the beans required for the example. Mocking of classes in java.lang. 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? The source code of the examples above are available on GitHub mincong-h/java-examples . You need to annotate the mocking object with the. Therefore, I am closing this as "Infeasible". (Ep. Mockito test a void method throws an exception. return new GatewayResponse(HttpStatus.NO_CONTENT,product, Message.SUCCESS.getDesc()); Are these quarters notes or just eighth notes? It's a simple matter of checking each object returned to see which one is null. Wanted 1 time: So the class under test was unable to find its required dependencies, creating the NPE. I was using wrong annotation/import of Mock, so my object was not getting formed. So to fix an error/bug in a test, you have to change production code? I am running through the same problem again. I have left comments on your draft PR. When I run the test in debug mode, I get Null Pointer Exception whenever I try to verify getUnsuccessfulCallData(false, syncMessage) is called or not. Mocking Method is certainly an issue. 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. Hi everyone, I have exactly this issue for existing tests migrating to any mockito from 3.5.0 to the current latest 3.10.0 And what I knew was the code enters to throwable after getting Null Pointer Exception on getUnsuccessfulCallData(false, syncMessage) and the test fails Saying . I don't think that's the correct approach. Somehow, Intellij assumed I want to use, I somehow missed this line "MockitoAnnotations.initMocks(this); ". Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey. @willa I have made these changes to the test but wondering if this truely tests what the method doeshttps://github.com/openmrs/openmrs-module-sync2/pull/149, https://github.com/openmrs/openmrs-module-sync2/pull/149. But I want to use when()..thenReturn() to get around creating this variable and so on. In my case, it was the wrong import for when(). Sign in @andrei-ivanov 's workaround works, but is quite slow. Thank you so much you saved me. view.hideProgressDialog(); However, I dont see anywhere where you are disabling pull. 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). 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. 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.) Getting Started with Mockito @Mock, @Spy, @Captor and - Baeldung }, @RunWith(MockitoJunitRunner.class) 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. Did the drapes in old theatres actually say "ASBESTOS" on them? Adding MockitoAnnotations.initMocks(this); worked, my tests seem to be using my mocks, how would I go about explicitly telling my service to use my mocks? 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. I m new to JUnit and Mockitio. Folder's list view has different sized fonts in different folders. Have you tried to go this way? in testing class it mocked object is mocking perfectly but when it goes to corresponding class that mocked reference is becoming null. There is mentioned that some of aren't supported. 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). 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. Mocked Dependency Object Is Null After Using Mockito @InjectMocks Sign up for a free GitHub account to open an issue and contact its maintainers and the community. When I mock this class in java, I get a null pointer exception. Does a password policy with a restriction of repeated characters increase security? Is it safe to publish research papers in cooperation with Russian academics? After removing that line from build.gradle things were started working. also, make sure the class and test method is public. one or more moons orbitting around a double planet system, Two MacBook Pro with same model number (A1286) but different year. Making statements based on opinion; back them up with references or personal experience. I finally reached the issue. In the following example, we'll create a mocked ArrayList manually without using the @Mock annotation: @Test public void whenNotUseMockAnnotation_thenCorrect() { List . Make sure that method() is not declared as final: Mockito cannot mock a final method and this will come up as a wrapped NPE: Buried deep in the error message is the following: None of the above answers helped me. @willa tried what you suggested but still have the NPE. * no. Well occasionally send you account related emails. What would help is to perform a bisect of Mockito versions to figure out which specific PR is causing issues. 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. rev2023.5.1.43405. How do the interferometers on the drag-free satellite LISA receive power without altering their geodesic trajectory? Have a question about this project? 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. Did you try to remove mocks until the issue no longer occurs? How do you assert that a certain exception is thrown in JUnit tests? Thanks for the help and suggestions! Why don't we use the 7805 for car phone chargers? public class StockController{ 4. I will be happy to look at the stack trace if you share it. Spring @Autowired Field Null - Common Causes and Solutions Which language's style guidelines should be used when writing code that is supposed to be called from another language? if you use @Mock Annotation to Context mockContext; But it will work if you use @RunWith(MockitoJUnitRunner.class) only. 3. I'm learning and will appreciate any help, A boy can regenerate, so demons eat him for years. { mockContext = Mockito.mock(Context.class); }, What do hollow blue circles with a dot mean on the World Map? I've managed to make a reproducer Making a mocked method return an argument that was passed to it. 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. This can be done in qn @Before method, in your own runner or in an own rule. rev2023.5.1.43405. Two MacBook Pro with same model number (A1286) but different year, "Signpost" puzzle from Tatham's collection. This is especially true for any class in java.lang.reflect. How to force Unity Editor/TestRunner to run at full speed when in background? mockito - NullPointerException when calling a mocked method - Stack Thanks! I have added the stacktrace below: ` org.mockito.exceptions.verification.TooManyActualInvocations: In you're example when (myService.getListWithData (inputData).get ()) will cause a NullPointerException because . Instead of mocking using static 'mock' method of Mockito library, it also provides a shorthand way of creating mocks using '@Mock . Sorted by: 1. The code above mocks the constructor of DBConnectionManager class and returns a mocked object of DBConnectionManager. Is there any known 80-bit collision attack? Ed Webb's answer helped in my case. https://github.com/mockito/mockito/wiki/FAQ, Junit 5 with InjectMocks. Mockito 2 can handle mocking final method. Am just thinking , do you have atom feeds started ? Apologies for the uninformative exception that is thrown. Does a password policy with a restriction of repeated characters increase security? Of course I don't know your full implementation. I removed the mocking of Method, as suggested . Changed it to @Before and it works like charm. I just want to make sure, that if any class calls this method, then no matter what, just return true or the list above. I'll add that note. * now. Working with EasyMock's mocks involves four steps: creating a mock of the target class. Hope it helped. Especially when for String you got error but for java.lang.reflect. Does a password policy with a restriction of repeated characters increase security? I was getting errors that made no sense but using Mockito.anyInt() rather than Mockito.any() solved it. Is null check needed before calling instanceof? 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. doCallRealMethod().when(parentFeedReader).pullAndProcessAllFeeds(); 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. I replaced @Mock with @InjectMocks - then issue was resolved. Spring testing support with override the real bean with the mock created using Mockito. mvn install on a whole product), then the mock is created, but is defective, e.g. Null Pointer Exception When Mocking Method With No Parameters - Github If I run the test class in a suite of tests (e.g. Spy. You haven't mocked the behavior of getId in externalDependencyObject therefore it is returning null and giving you the NPE when toString() is called on that null. String productId = pr455; Is "I didn't think it was serious" usually a good defence against "duty to rescue"? public void pullAndProcessAllFeeds_shouldNotSyncIfPullIsDisabled() { How do the interferometers on the drag-free satellite LISA receive power without altering their geodesic trajectory? 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. Why the obscure but specific description of Jane Doe II in the original complaint for Westenbroek v. Kappa Kappa Gamma Fraternity? Jun 6, 2014 at 1:13. 2. Introduction to EasyMock | Baeldung I read the #1833 and sounds as good improvement. As for the error occuring when not mocking core classes. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Maybe would be nice solve it in same way as is e.g. Already on GitHub? @ManoDestra No, how? And the stack trace tells you precisely where it is occurring: PingerServiceTests.java:44. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 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. Find centralized, trusted content and collaborate around the technologies you use most. Did you manage to resolve this? What is a NullPointerException, and how do I fix it? After making function open tests started to pass. I was using junit 4 for testing and used @BeforeEach instead of @Before while initializing. Most of the people just forget to specify the test runner, running class for mocking. Can you please create another question on StackOverflow with a complete example. I get a crash when I mock a method in an interface that doesn't take any parameters. Most spring boot applications have a class @SpringBootApplication annotation somewhere that will be found when the test is launched. It, 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. And instead, you can also try add. I am facing the same issue, but this time I am implementing an interface method that uses another class's method which for some reason returns null. i declared MockMvc object also bt didnt mension here, when debugging in StockController i am getting null pointer Exception in -> if (optional.isPresent()). So I started writing tests for our Java-Spring-project. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. How do you assert that a certain exception is thrown in JUnit tests? Something like So you are running your test and suddenly you see NullPointerException: You looked it up, and it seems your test is written correctly. In my case (not the case for this question), I was trying to mock a dependency for another Mock for the UUT (i.e. You might as well consider using compiler's "all-open" plugin: Kotlin has classes and their members final by default, which makes it inconvenient to use frameworks and libraries such as Spring AOP that require classes to be open. 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. When this class that contains this mocking is run alone that the test is green in Eclipse and maven too. As per Mockito you can create mock object by either using @Mock or Mockito.mock(Context.class); , I got NullpointerException because of using @RunWith(PowerMockRunner.class), instead of that I changed to @RunWith(MockitoJUnitRunner.class) it works fine. He also rips off an arm to use as a sword. My tests work with Mockito 3.3.3, but fail with 3.6.0. I've replicated the same conditions in a unit test with robolectric and that problem doesn't exist. 3. P.S You need to think which class you actually want to test, that determines which instances should be mocked. Unfortunately, Method is one of the classes that Mockito relies on internally for its behavior. It's important to note that we should only use it in a test class. Mockito.doNothing () keeps returning null pointer exception
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