mockito mock annotation null pointer exception

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 Generating points along line with specifying the origin of point generation in QGIS, Folder's list view has different sized fonts in different folders. He also rips off an arm to use as a sword. Turns out I hadn't included the maven-surefire-plugin in my pom.xml and that meant the @ExtendWith wasn't actually doing anything! What if we must allow NullPointerException in Some Places. Two MacBook Pro with same model number (A1286) but different year. For some reason, my IDE was importing org.testng.annotations.Test by default. Otherwise thanx for your input. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. I will be happy to look at the stack trace if you share it. Then as if by magic, it started working for me. 3. Thanks for the help and suggestions! It's not them. 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 . I've replicated the same conditions in a unit test with robolectric and that problem doesn't exist. To learn more, see our tips on writing great answers. Change getUnsuccessfulCallData(showDialog: Boolean, syncMessage: String) to open instead of internal or enable mock-maker-inline (if you haven't already). Verify method called throws Null Pointer Exception 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. We can use @Mock to create and inject mocked instances without having to call Mockito.mock manually. https://github.com/mockito/mockito/wiki/FAQ, Junit 5 with InjectMocks. 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). Yes @InjectMocks is for exactly the same purpose to use all the Mock objects. In my case i forgot to initialize my variables effectively THANK YOU !! Most likely, you mistyped returning function. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Core Concepts. Identify blue/translucent jelly-like animal on beach. 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. the method needs to be marked open for this to work: Marking the method open, makes it work! The object is null though, so the unboxing fails accessing a null pointer. for String class so some error message that point to this. of the mocked class would not be executed. 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. When I pass from mockito(-jupiter) 3.4.6 to 3.5.0 everything goes wrong. I used import static reactor.core.publisher.Mono.when by accident. Apr 25, 2016 at 18:45. Which reverse polarity protection is better and why? Not the answer you're looking for? if you use @Mock Annotation to Context mockContext; But it will work if you use @RunWith(MockitoJUnitRunner.class) only. 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. It's said, that when I use the when()thenReturn() option I can mock services, without simulating them or so. Making statements based on opinion; back them up with references or personal experience. The NPE happens at @InjectMocks annotation which means the mock framework is not able to find some mocks to inject during initialization. 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. It's a simple matter of checking each object returned to see which one is null. toString() results in a null pointer exception, and using the mock also results in a null pointer exception. Thank you very much! Connect and share knowledge within a single location that is structured and easy to search. return new GatewayResponse(HttpStatus.Ok,product, Message.SUCCESS.getDesc()); Much love! You signed in with another tab or window. However, I dont see anywhere where you are disabling pull. I'm the next poor soul lol. public void pullAndProcessAllFeeds_shouldNotSyncIfPullIsDisabled() { Well occasionally send you account related emails. Mockito.doNothing() keeps returning null pointer exception, When AI meets IP: Can artists sue AI imitators? Find centralized, trusted content and collaborate around the technologies you use most. You signed in with another tab or window. parentFeedReader.pullAndProcessAllFeeds(); @Mock After removing that line from build.gradle things were started working. 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. Check your imports, based on the usage of. @andrei-ivanov 's workaround works, but is quite slow. Instead of mocking using static 'mock' method of Mockito library, it also provides a shorthand way of creating mocks using '@Mock . I'll add that note. Product product = optional.get(); 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. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. In my case I am mocking an interface, final is not involved. When generating a mock, we can simulate the target object, specify its behavior, and finally verify whether it's used as expected. 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. What is Wario dropping at the end of Super Mario Land 2 and why? For JUnit5 check, you are using proper imports also. Mockito: Trying to spy on method is calling the original method. I'm learning and will appreciate any help, A boy can regenerate, so demons eat him for years. I'd need more detail to to look into it. MockitoAnnotations.initMocks(this) basically initializes objects annotated with Mockito annotations for the test class. MockitoExtension does not have a callback for @BeforeAll. I was mocking Method too, but not in any test in error, not so easy to find, I have more than 300 in this project. How to force Unity Editor/TestRunner to run at full speed when in background? Specify Mockito running class. What does 'They're at four. Therefore, I am closing this as "Infeasible". Product pr = new Product(); To subscribe to this RSS feed, copy and paste this URL into your RSS reader. So, first we should mock a parameter, for instance. You run you test using SpringJUnit4ClassRunner and as far as I know, @Mock doesn't work unless you use MockitoJunitRunner or MockitoAnnotations.initMocks(this);. In the following example, we'll create a mocked ArrayList manually without using the @Mock annotation: @Test public void whenNotUseMockAnnotation_thenCorrect() { List . rev2023.5.1.43405. Not the answer you're looking for? Mockito cannot mock the final method. This seems so basic that I must be doing something . 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). 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. What does 'They're at four. This object is unboxed to an integer, so the generic type is determined to be 'Integer'. 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? @willa tried what you suggested but still have the NPE. Where might I find a copy of the 1983 RPG "Other Suns"? 3. Does a password policy with a restriction of repeated characters increase security? Add @ExtendWith(MockitoExtension.class) annotation to the test class and it should work given You are using Junit 5+ version. So we mostly read now only what is new = e.g. 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. How to verify that a specific method was not called using Mockito? I tend to not mock the class under test (i.e. So I started writing tests for our Java-Spring-project. *, as Mockito has to make extensive use of reflection to function correctly. Not the answer you're looking for? Can you please create another question on StackOverflow with a complete example. One option is create mocks for all intermediate return values and stub them before use. @Test In most of the test classes @RunWith(MockitoJUnitRunner.class) works fine in injecting mocks. You seem to mix Spring, and Mockito. Verify Method called throws Null Pointer exception. 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. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. What do hollow blue circles with a dot mean on the World Map? 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. Maybe this will help the next poor soul. The url value you are using to stub the HttpUrlConnection creation from HttpAdapter i.e call to httpAdapter.createHttpURLConnection doesnt match the value you are passing to pingerService.ping. privacy statement. Has anyone been diagnosed with PTSD and been able to get a first class medical? Asking for help, clarification, or responding to other answers. Dont forget to annotate your Testing class with @RunWith(MockitoJUnitRunner.class). 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(). What is this brick with a round back and a stud on the side used for? 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. The stack trace which is in surefire reports would show exactly what other mocks you need. The test keeps failing with a null pointer exception. 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. Is there such a thing as "right to be heard" by the authorities? IMHO using the MockitoRule is the best one, because it lets you still choose another runner like e.g. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Canadian of Polish descent travel to Poland with Canadian passport. I creat. How to subdivide triangles into four triangles with Geometry Nodes? Thanks for contributing an answer to Stack Overflow! Could a subterranean river or aquifer generate enough continuous momentum to power a waterwheel for the purpose of producing electricity? Same problem can occur if you are using Junit5 since there is no more '@RunWith' annotation. I get a crash when I mock a method in an interface that doesn't take any parameters. But for sure, NullPointerException happened because you want something which is not there. I removed the mocking of Method, as suggested . And here is not fully clear. to your account. As for the error occuring when not mocking core classes. What do hollow blue circles with a dot mean on the World Map? You have to make class and member functions open, otherwise NPE was being thrown. The most likely candidate for the regression is probably #2004 @raphw does this exception ring any bells? This annotation is a shorthand for the Mockito.mock() method. I had to change it to org.junit.Test and it worked. If not share your stack trace as well as the code you are running. That's a good remark, Ridcully. using mocks in tests. Figured out what was wrong, I needed to auto wire the service. What is this brick with a round back and a stud on the side used for? What positional accuracy (ie, arc seconds) is necessary to view Saturn, Uranus, beyond? - ManoDestra. How do the interferometers on the drag-free satellite LISA receive power without altering their geodesic trajectory? Mocking Method is certainly an issue. But for sure, NullPointerException happened because you want something which is not there. Try to to check if the method that you are calling is a final method or not. Having the same problem using Junit 5 , I resolve it using : @ExtendWith(MockitoExtension.class) instead of @RunWith(MockitoJUnitRunner.class) . Hope it helped. also, make sure the class and test method is public. Sign in FYI: I am using following versions of Gradle dependencies: Your repository instance is mocked and thus will return null for all unstubbed method calls. //add the behavior to throw exception doThrow (new Runtime Exception ("divide operation not implemented")) .when (calcService).add (10.0,20.0); Here we've added an exception clause to a mock object. I am using JUnit version 4 and i still needed "@RunWith(MockitoJUnitRunner.class)" annotation for "when" method to work properly. Mockito.when(parentFeedReader.enabled()).thenReturn(false); The issue was that the activity that I was testing extended AppCompatActivity instead of Activity. BSMP. You will have to adapt to your environment/configuration. 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. When using JUnit 5 or above. * is unsupported, as Mockito itself is based on these classes. When this class that contains this mocking is run alone that the test is green in Eclipse and maven too. " @Test(expected = SyncException.class) So to fix an error/bug in a test, you have to change production code? @ManoDestra No, how? 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. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Well occasionally send you account related emails. 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? Asking for help, clarification, or responding to other answers. We don't need mock this class now. Where does the version of Hamapil that is different from the Gemara come from? Can you do a draft pull request and we take a look? Mockito: Trying to spy on method is calling the original method. Please, read the page How to create a Minimal, Reproducible Example and edit your question to include testable code, showing that NPE, so we can, at least, see how and where it is occuring. view.hideProgressDialog(); rev2023.5.1.43405. The above will produce the same exact issue as OP. Connect and share knowledge within a single location that is structured and easy to search. Did the drapes in old theatres actually say "ASBESTOS" on them? 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. while doing Mock to Window geting null instance Because I assume that the field to mock is never mocked. Why the obscure but specific description of Jane Doe II in the original complaint for Westenbroek v. Kappa Kappa Gamma Fraternity? 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. Identify blue/translucent jelly-like animal on beach, "Signpost" puzzle from Tatham's collection. Mockito : how to verify method was called on an object created within a method? Is null check needed before calling instanceof? Here is a working example of DocumentRepositoryTest class for reference: DocumentRepositoryTest class is mocking documentRepository object. So instead of when-thenReturn , you might type just when-then. Ubuntu won't accept my choice of password. Already on GitHub? This also applies to method calls within when (.). But in few test classes both @RunWith(MockitoJUnitRunner.class) and MockitoAnnotations.initMocks(this) worked together only. For me the reason I was getting NPE is that I was using Mockito.any() when mocking primitives. Wondering if it is the version of mockito: Ok - figured it out - it is because the method is final. Take a look at the following code snippet. to your account. To fix this, I was able to just replace AppCompatActivity with Activity since I didn't really need it. Is there such a thing as "right to be heard" by the authorities? { This is clearly related to Mockito and my spring beans not being injected correctly. A temporary workaround is to fork each test, though build times suffer somewhat. If you are using older version of Junit use @RunWith(MockitoJUnitRunner.class) annotation. to your account. Spring testing support with override the real bean with the mock created using Mockito. It doesnt work for me always gives this error "dexcache == null (and no default could be found; consider setting the 'dexmaker.dexcache' system property)". }, @RunWith(MockitoJunitRunner.class) You can use our Bintray repository which hosts all of our versions to hopefully determine the exact version at which things start to break: https://bintray.com/mockito/maven/mockito. Has anyone faced the same issue? Connect and share knowledge within a single location that is structured and easy to search. Unfortunately, Method is one of the classes that Mockito relies on internally for its behavior. MockitoJunitRunner will you create a Mock object based on the type you demand StockService in your guess. Two MacBook Pro with same model number (A1286) but different year, "Signpost" puzzle from Tatham's collection. catch(Exception e) Can corresponding author withdraw a paper after it has accepted without permission/acceptance of first author. Canadian of Polish descent travel to Poland with Canadian passport, xcolor: How to get the complementary color, Ubuntu won't accept my choice of password, Two MacBook Pro with same model number (A1286) but different year, User without create permission can create a custom object from Managed package using Custom Rest API. How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version, Use Mockito to mock some methods but not others, Mockito test a void method throws an exception, Difference between @Mock and @InjectMocks. devnews.today != http://devnews.today. To configure the exception itself, we can pass the exception's class as in our previous examples or as an object: 5. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 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. Read more >. Of course I don't know your full implementation. a GitHub project that we can run and debug. What would help is to perform a bisect of Mockito versions to figure out which specific PR is causing issues. 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 . 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. Have you tried to go this way? https://github.com/openmrs/openmrs-module-sync2/commit/3dec2022a0d5058c45fce3f9abdc106ce0b8c833. How to verify that a specific method was not called using Mockito? 5. 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). In Groovy, you have meta-object protocol or MOP that allows you to use meta-programming techniques. Yes I did, But getting same error Null Pointer Exception. For example: Or alternatively, you can specify a different default answer when creating a mock, to make methods return a new mock instead of null: RETURNS_DEEP_STUBS. Can anybody tell me what am I doing wrong? I hope it helps. What's the most energy-efficient way to run a boiler? The test example did not so I had to sort of fake it. 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. For Kotlin : @RunWith(MockitoJUnitRunner::class). Does anyone know why this behaviour happens when the method is not "open" ? 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. How do you test that a Python function throws an exception? @BeforeEach helped me here but it always depends on execution context. It's not them. Mocking classes that Mockito (or Byte Buddy) use internally will change the behavior of Mockito (or Byte Buddy) and lead to errors. 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. JUnit and Mockito Null Pointer Exception [duplicate], When AI meets IP: Can artists sue AI imitators? 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. Thanks for contributing an answer to Stack Overflow! 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. toString() results in a null pointer exception, and using the mock also results in a null pointer exception. Leaving this comment for the next poor soul. DiscountCalculator mockDiscountCalculator = Mockito.mock(DiscountCalculator.class); #2) Mock creation with Annotations. 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. But why do I get Null Pointer Exception here ? Mockito : how to verify method was called on an object created within a method? Especially when for String you got error but for java.lang.reflect. 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. Yes, indeed, now I found one mock of the Method which indeed the culprit. When I mock this class in java, I get a null pointer exception. This article is a shortlist of the three most common reasons why this might be happening. private StockService stockService; public GatewayResponse findProduct(String productId) { I don't think that's the correct approach. 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. 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. I tried to add a mock for two other classes in my code and the DBConnectionManager mocked objects always return null. 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. -> 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 @andrei-ivanov How did you go about this in the end? Mockito 2 can handle mocking final method. So I had: I have no idea why that produced a NullPointerException. } 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. This does not work trivially, and so the second layer mock was null. 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. First you dont need both @RunWith(MockitoJUnitRunner.class) and MockitoAnnotations.initMocks(this); at the same time. Debug and check if you are returning something. This worked for me. We can also configure Spy to throw an exception the same way we did with the mock: 6. But I want to use when()..thenReturn() to get around creating this variable and so on. I'm also a big fan of mockito when using Java. For me adding the annotation to the class: and modifying the version of Mockito solved this issue. For Mockito, there is no direct support to mock private and static methods. 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. Any pointers on what i should do? 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. recording its expected behavior, including the action, result, exceptions, etc. And instead, you can also try add. Thanks for contributing an answer to Stack Overflow! Check that the method signature is not declared as final. I was getting errors that made no sense but using Mockito.anyInt() rather than Mockito.any() solved it. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. I found that by switching to using the correct variant from mockito gets rid of the errors. our application uses JUNIT5 , same issue occured. Connect and share knowledge within a single location that is structured and easy to search. Any chance to get an error or a warning for these classes if we try to mock them? There is mentioned that some of aren't supported. However I'm trying to mock a net.sf.ehcacheCache object. Presentation of the Problem. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. return new GatewayResponse(HttpStatus.NO_CONTENT,product, Message.SUCCESS.getDesc()); 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).

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