When calculating CR, what is the damage per turn for a monster with multiple attacks? The code above mocks the constructor of DBConnectionManager class and returns a mocked object of DBConnectionManager. in an @BeforeEach setup. Has anyone faced the same issue? I moved the stubbing inside the test method it worked!! The object is null though, so the unboxing fails accessing a null pointer. So instead of when-thenReturn , you might type just when-then. Can you do a draft pull request and we take a look? This article is a shortlist of the three most common reasons why this might be happening. Check which version of Junit you are using. "Signpost" puzzle from Tatham's collection. Does a password policy with a restriction of repeated characters increase security? Make sure the rule is also on a public class or you will receive the message: Found this solution in comments that worked for me. Thanks for contributing an answer to Stack Overflow! This mean you should explicitly use doCallRealMethod (yourMock).when (yourMethod ()) if you want the mock's method to behave like it normally would. Eigenvalues of position operator in higher dimensions is vector, not scalar? How do you assert that a certain exception is thrown in JUnit tests? I don't know if it helps but in Java 15 I got this log : Sadly I don't have a lot of free cycles to investigate this issue. Connect and share knowledge within a single location that is structured and easy to search. Otherwise thanx for your input. Yes I have worked on a prototype to make that happen: #1833 Sadly I haven't had the time to get back to that. Does the order of validations and MAC with clear text matter? Thank you very much! In this case you should annotate your class with: You should also import into your dependency (Maven - pom.xml): You have three options for activating the @Mock annotation: MockitoRule, MockitoJUnitRunner, MockitoAnnotations.initMocks(this). I finally reached the issue. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. @TimvdLippe In my case I'm mocking also my own classes and get the same NPE. Presentation of the Problem. 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. MvcResults mvcResults = mockMvc.perform(get(/product).param(id, productId)).andExpect(Status().isOk()).andReturn(); 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. 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. BSMP. This only happens in Android Espresso tests. @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. Based on above suggestion https://stackoverflow.com/a/55616702/2643815. ', referring to the nuclear power plant in Ignalina, mean? @andrei-ivanov 's workaround works, but is quite slow. public class StockController{ Do this for all the mocks you are creating. But I want to use when()..thenReturn() to get around creating this variable and so on. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. We don't need mock this class now. For me, even after adding @RunWith(MockitoJUnitRunner.class) it was not working. I replaced @Mock with @InjectMocks - then issue was resolved. 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? But why do I get Null Pointer Exception here ? 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. 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. I tried different version. My tests work with Mockito 3.3.3, but fail with 3.6.0. I'd need more detail to to look into it. You will have to adapt to your environment/configuration. Yes, indeed, now I found one mock of the Method which indeed the culprit. It is stored in surefire reports directory. By clicking Sign up for GitHub, you agree to our terms of service and with stubbing behaviour of the MyService mock instance: When you do this, the MyRepository test suite mock instance can be removed, as it is not required anymore. Cache cache = mock (Cache.class); when (cache.get (anyObject ())).thenReturn (null); I get a null pointer exception when cache.get tries to access the. And here is not fully clear. My issue was that I was trying to mock an object which was final in my service. ', referring to the nuclear power plant in Ignalina, mean? When calculating CR, what is the damage per turn for a monster with multiple attacks? In my case, it was the wrong import for when(). Mockito.doNothing () keeps returning null pointer exception. What is this brick with a round back and a stud on the side used for? if (optional.isPresent()) { @InjectMocks annotation on the service? 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. (Ep. rev2023.5.1.43405. This doesnt answer the OP's original query, but its here to try help others with Mockito null pointer exceptions (NPE). Is there any explaination for this issue ? I had the same issue, but I found updating my tests (which were originally written for JUnit 3 and used the legacy setUp() and tearDown() methods) to JUnit 4 and modern annotated fixture methods worked. From first glance, I think your problem is with the Spring application context. 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. @willa tried what you suggested but still have the NPE. When you want to use the @Mock annotation you should use the MockitoJUnitRunner. 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. Apologies for the uninformative exception that is thrown. If I run it with SpringJUnit4ClassRunner, I get application initialization error if I change from MockBean to Mock for Consumer because the Consumer is AUTOWIRED in the service class, I added a sample using SpringJUnit4ClassRunner in combination with SpringBoots @MockBean annotation. The @Mock annotation requires a test suite that searches for the annotation and gathers the information to inject the values there. Maybe it was IntelliSense. [mockito] NullPointerException thrown when mocking Groovy class } ". +1 for the "make sure your are using JUnit for all annotations"! In my case I was trying to mock a property which was annotated with @JvmField. 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. Required fields are marked *. This worked for me. Use one or the other, in this case since you are using annotations, the former would suffice. We'll also explain how to fix the problem. Also note that there's nothing in your code that makes your service use your mocks. To configure the exception itself, we can pass the exception's class as in our previous examples or as an object: 5. Does anyone know why this behaviour happens when the method is not "open" ? You probably wanted to return the value for the mocked object. Null pointer exception when using Mockito to mock interface. There are two solutions: Use deep stubbing: ValueProducerFactory valueProducerFactory = Mockito.mock(ValueProducerFactory.class, Mockito.RETURNS_DEEP . call, which is null because you haven't mocked it yet. Break even point for HDHP plan vs being uninsured? When using @ExtendWith(MockitoExtension.class) make sure you're using JUnit 5: import org.junit.jupiter.api.Test; When using @RunWith(MockitoJUnitRunner.class) make sure you're using JUnit 4: import org.junit.Test; so this can be helpful to somebody who see such error. That's why you get a NPE, because mockHttpURLConnection is null in your test method. However, I am getting nullpointer exception. I don't know what's wrong, but it says that, One of them is enough for use @mock annotation, Thank you for answering! Generating points along line with specifying the origin of point generation in QGIS, Folder's list view has different sized fonts in different folders. Removing the annotation, which wasn't needed in my case, did the trick. Thankyou Rammgarot. It's a simple matter of checking each object returned to see which one is null. You need to annotate the mocking object with the. For me adding the annotation to the class: and modifying the version of Mockito solved this issue. Has anyone been diagnosed with PTSD and been able to get a first class medical? view.hideProgressDialog(); Mockito test a void method throws an exception. I see that when the, When AI meets IP: Can artists sue AI imitators? Debug and check if you are returning something. You have three options for activating the @Mock annotation: MockitoRule, MockitoJUnitRunner, MockitoAnnotations.initMocks(this). @pyus13 This should be a new question with more code. ")), verify(presenter).getUnsuccessfulCallData(eq(false), eq("Call synced successfully.")). We started with 1.10.19 version. (Ep. @dkayiwa. 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. First you don't need both @RunWith (MockitoJUnitRunner.class) and MockitoAnnotations.initMocks (this); at the same time. I'm the next poor soul lol. I came across this issue while writing unit tests for Android. rev2023.5.1.43405. Your tests are making large assumptions that they have each object (non null) returned from the previous call. This is especially true for any class in java.lang.reflect. Already on GitHub? 3. When to use LinkedList over ArrayList in Java? Null Pointer Exception When Mocking Method With No Parameters - Github 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. ClientError: GraphQL.ExecutionError: Error trying to resolve rendered. So to fix an error/bug in a test, you have to change production code? From current documentation it isn't really clear if this is or isn't supported. 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. @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. 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. Here is a working example of DocumentRepositoryTest class for reference: DocumentRepositoryTest class is mocking documentRepository object. It's not them. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. two layers of mocks). Can corresponding author withdraw a paper after it has accepted without permission/acceptance of first author. Not the answer you're looking for? So the class under test was unable to find its required dependencies, creating the NPE. If the null hypothesis is never really true, is there a point to using a statistical test without a priori power analysis? Is there a generic term for these trajectories? When I pass from mockito(-jupiter) 3.4.6 to 3.5.0 everything goes wrong. Specify Mockito running class. It seems that creating a mock of a particular class/interface in a lot of tests from independent test classes exposes this problem. Identify blue/translucent jelly-like animal on beach, "Signpost" puzzle from Tatham's collection. https://github.com/openmrs/openmrs-module-sync2/commit/3dec2022a0d5058c45fce3f9abdc106ce0b8c833. Mockito.doNothing () keeps returning null pointer exception } Worked example; To subscribe to this RSS feed, copy and paste this URL into your RSS reader. is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. verify(presenter, times(1)).getUnsuccessfulCallData(eq(false), eq("Call synced successfully. NullPointerException when using Mockito - OpenMRS Talk Can you please create another question on StackOverflow with a complete example. 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. Mocking of classes in java.lang. parentFeedReader.pullAndProcessAllFeeds(); (Ep. In my case a tested method called another method as a parameter: While repository is mocked, prefs.getUser().id) will throw NPE. @Mock Annotation. Therefore, we can't guarantee the correct behavior of Mockito if Mockito is instructed to modify the classes it is built on. Hope it helped. I could confirm that have this issue too. The above will produce the same exact issue as OP. And the stack trace tells you precisely where it is occurring: Take a look at the test class in this example, I don't think you should be using Autowired annotation in a test class. My NPE was happening as I did not explicitly set the class under tests' dependencies to be the classes I had mocked. getUnsuccessfulCallData(false, syncMessage) throws Null Pointer Exception which is inside subscribe of fun syncLocalOrders(syncOrders: SyncOrders). How to force Unity Editor/TestRunner to run at full speed when in background? Mocking classes that Mockito (or Byte Buddy) use internally will change the behavior of Mockito (or Byte Buddy) and lead to errors. return new GatewayResponse(HttpStatus.NO_CONTENT,product, Message.SUCCESS.getDesc()); Where might I find a copy of the 1983 RPG "Other Suns"? Your email address will not be published. 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. For Kotlin : @RunWith(MockitoJUnitRunner::class). THANK YOU!!!! mvn install on a whole product), then the mock is created, but is defective, e.g. @Mock The all-open compiler plugin adapts Kotlin to the requirements of those frameworks and makes classes annotated with a specific annotation and their members open without the explicit open keyword. This annotation is a shorthand for the Mockito.mock() method. It's important to note that we should only use it in a test class. I got null pointer bcoz of @RunWith(PowerMockRunner.class), instead of that I changed to @RunWith(MockitoJUnitRunner.class). I fallowed above rules correctly. After removing that line from build.gradle things were started working. What positional accuracy (ie, arc seconds) is necessary to view Saturn, Uranus, beyond? By clicking Sign up for GitHub, you agree to our terms of service and Since you didn't stub the updateUser function it returned null and the NPE is thrown. I had to change it to org.junit.Test and it worked. Already on GitHub? // Null pointer exception saying bar is null. Could a subterranean river or aquifer generate enough continuous momentum to power a waterwheel for the purpose of producing electricity? document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. Getting a null pointer exception when invoking a method on a mock I am attempting to mock HttpURLConnection and make getResponseCode return a 404, however I am getting a Null Pointer Exception. However I'm trying to mock a net.sf.ehcacheCache object. The source code of the examples above are available on GitHub mincong-h/java-examples . to your account. 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). Why did DOS-based Windows require HIMEM.SYS to boot?