mockito mock annotation null pointer exception

Therefore, we can't guarantee the correct behavior of Mockito if Mockito is instructed to modify the classes it is built on. Exception as an Object. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. [mockito] NullPointerException thrown when mocking Groovy class Sign in Please create a small reproduction case, e.g. 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. And most likely very trivial. @David I think your problem should be a new question with a complete example. using mocks in tests. It can cover both Constructor injected & Field injected dependencies. But for sure, NullPointerException happened because you want something which is not there. StockController stockController; Original implementation is changed in the meantime and we don't mock java.lang.reflect. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Is it a basically misunderstanding from my side, or is there something else wrong? { To subscribe to this RSS feed, copy and paste this URL into your RSS reader. It's not that Mockito guys didn't do a good job, this behavior is documented . 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. if you use @Mock Annotation to Context mockContext; But it will work if you use @RunWith(MockitoJUnitRunner.class) only. 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. When you run mvn test maven will report the location of this directory. public void pullAndProcessAllFeeds_shouldNotSyncIfPullIsDisabled() { { Example Error: Thanks !!! NullPointerException when mocking more than one static method - Github Im still using Junit 4 for reasons outside my control. And so the dependencies inside the MyClass remained null causing a null reference exception to be thrown once used. Spy. Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey. The use case of @MockBean is integration test cases. 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. I tried to add a mock for two other classes in my code and the DBConnectionManager mocked objects always return null. Updated the example, even with this set, it is still returning null. It was working before but I understand that it is not a good practise. Can Mockito capture arguments of a method called multiple times? In this tutorial, we'll see common errors that lead to a NullPointerException on an Autowired field. Is there a generic term for these trajectories? In short in semi-pseudocode it should look like the following; @willa I finally figured out a way by mocking the class plus mocking the some methods and then calling the real method. Thanks hope this will save someone's time. I got null pointer bcoz of @RunWith(PowerMockRunner.class), instead of that I changed to @RunWith(MockitoJUnitRunner.class). NullPointerException in java.lang.reflect.Method.getParameterTypes, Add annotation to mark a type as DoNotMock, https://github.com/mockito/mockito/wiki/How-to-write-good-tests#dont-mock-a-type-you-dont-own, https://bintray.com/mockito/maven/mockito, NullPointerException when calling methods on spy of a final class with JDK > 11, Failed to mock interface in Debian but succeeded in Mac OS, Update Mockito and ByteBuddy to help with GraalVM integration, [no ticket][risk=no] Avoid mocking java.lang.reflect.Method in tests. Working with EasyMock's mocks involves four steps: creating a mock of the target class. So what I want to do is, to set: But no matter which when-clause I do, I always get a NullpointerException, which of course makes sense, because input is null. Debug and check if you are returning something. Asking for help, clarification, or responding to other answers. Matchers wont work for primitives, so if the argument is a primitive you will will need the anyChar/Int/Boolean etc. Thanks for contributing an answer to Stack Overflow! Actually, you just allow null as a value for switch, so you' d now have to implement all the cases where switch is null as well, in your method. So the class under test was unable to find its required dependencies, creating the NPE. 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. " @Test(expected = SyncException.class) } The reason why is that any() returns a generic object reference. "Signpost" puzzle from Tatham's collection. Yes @InjectMocks is for exactly the same purpose to use all the Mock objects. I've managed to make a reproducer Therefore, I would be inclined to close this issue as WontFix, unless @nguyenquoc you are mocking a non-java.lang. Corner case: Read more >. However, questions do not belong in answers, which is why I've removed it. What positional accuracy (ie, arc seconds) is necessary to view Saturn, Uranus, beyond? Mockito 2 can handle mocking final method. You need to instantiate the routingClientMock e.g. I was getting errors that made no sense but using Mockito.anyInt() rather than Mockito.any() solved it. But why do I get Null Pointer Exception here ? How do you test that a Python function throws an exception? 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. Is there such a thing as "right to be heard" by the authorities? The text was updated successfully, but these errors were encountered: You should use doReturn/when construct instead of whenever/thenReturn. P.S You need to think which class you actually want to test, that determines which instances should be mocked. Maybe this will help the next poor soul. Making statements based on opinion; back them up with references or personal experience. Where can I find the specification/docs for the first sentence of the answer? Well occasionally send you account related emails. 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. If you are sure by your mocking skills, the issue will be probably somewhere else. However I'm trying to mock a net.sf.ehcacheCache object. UPDATED: adding sample using spring junit runner and using spring boot's mockbean annotation. Same problem can occur if you are using Junit5 since there is no more '@RunWith' annotation. To learn more, see our tips on writing great answers. mvn install on a whole product), then the mock is created, but is defective, e.g. I am using JUnit version 4 and i still needed "@RunWith(MockitoJUnitRunner.class)" annotation for "when" method to work properly. Two MacBook Pro with same model number (A1286) but different year. Instead of mocking using static 'mock' method of Mockito library, it also provides a shorthand way of creating mocks using '@Mock . 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. In your example, make sure that you have: Once I did that, the NullPointerExceptions disappeared. I was using wrong annotation/import of Mock, so my object was not getting formed. 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(). Yes I did, But getting same error Null Pointer Exception. It doesnt work for me always gives this error "dexcache == null (and no default could be found; consider setting the 'dexmaker.dexcache' system property)". Worked example; To subscribe to this RSS feed, copy and paste this URL into your RSS reader. @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. In my case, my Mockito annotation didn't match the JUnit Version. Identify blue/translucent jelly-like animal on beach, "Signpost" puzzle from Tatham's collection. 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. In my case i forgot to initialize my variables effectively THANK YOU !! https://github.com/openmrs/openmrs-module-sync2/commit/3dec2022a0d5058c45fce3f9abdc106ce0b8c833. 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. Can you do a draft pull request and we take a look? Check your imports, based on the usage of. Figured out what was wrong, I needed to auto wire the service. } This also applies to method calls within when (.). 3. Can you show all the declaration of the class. I see that when the someDao.findMe (someObject.getId.toString ()) execute it does NOT trigger my MockDao return statement, but instead tries to evaluate someObject.getId.toString (). For Kotlin : @RunWith(MockitoJUnitRunner::class). 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. So what might be a problem if you know how the mocking works? P.S You need to think which class you actually want to test, that determines which instances should be mocked. The test example did not so I had to sort of fake it. 2. This mean you should explicitly use doCallRealMethod (yourMock).when (yourMethod ()) if you want the mock's method to behave like it normally would. You run you test using SpringJUnit4ClassRunner and as far as I know, @Mock doesn't work unless you use MockitoJunitRunner or MockitoAnnotations.initMocks(this);. doCallRealMethod().when(parentFeedReader).pullAndProcessAllFeeds(); rev2023.5.1.43405. Jun 6, 2014 at 1:13. Break even point for HDHP plan vs being uninsured? When to use LinkedList over ArrayList in Java? Making statements based on opinion; back them up with references or personal experience. Required fields are marked *. Somehow, Intellij assumed I want to use, I somehow missed this line "MockitoAnnotations.initMocks(this); ". Changed it to @Before and it works like charm. xcolor: How to get the complementary color. ")), verify(presenter).getUnsuccessfulCallData(eq(false), eq("Call synced successfully.")).

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