Vert.x 4 with Mockito 3.6.28 "cannot mock this class: interface io.vertx.ext.web.RoutingContext"

[Guillaume Grossetie]

Hey,

First congrats for your hard work on Vert.x 4! Keep it up!

As the title suggests, I'm migrating a project to Vert.x 4 from 3.9.4 and I get the following exception when running my tests suite:

org.mockito.exceptions.base.MockitoException: 

Mockito cannot mock this class: interface io.vertx.ext.web.RoutingContext.

Mockito can only mock non-private & non-final classes.

If you're not sure why you're getting this error, please report to the mailing list.

Java               : 1.8

JVM vendor name    : Oracle Corporation

JVM vendor version : 25.171-b11

JVM name           : Java HotSpot(TM) 64-Bit Server VM

JVM version        : 1.8.0_171-b11

JVM info           : mixed mode

OS name            : Linux

OS version         : 5.4.0-56-generic

Underlying exception : java.lang.IllegalStateException: Error invoking java.lang.reflect.Method#getAnnotatedReturnType

at io.kroki.server.service.WavedromServiceTest.should_call_wavedrom(WavedromServiceTest.java:30)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:688)

at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)

at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)

at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149)

at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:140)

at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:84)

at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(ExecutableInvoker.java:115)

at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105)

at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)

at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)

at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)

at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)

at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104)

at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98)

at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:210)

at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)

at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:206)

at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:131)

at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:65)

at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)

at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)

at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)

at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)

at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)

at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)

at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)

at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)

at java.util.ArrayList.forEach(ArrayList.java:1257)

at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)

at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)

at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)

at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)

at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)

at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)

at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)

at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)

at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)

at java.util.ArrayList.forEach(ArrayList.java:1257)

at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)

at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)

at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)

at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)

at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)

at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)

at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)

at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)

at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)

at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)

at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)

at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)

at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:108)

at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:88)

at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0(EngineExecutionOrchestrator.java:54)

at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:67)

at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:52)

at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:96)

at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:75)

at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:71)

at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)

at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:220)

at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:53)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at com.intellij.rt.execution.application.AppMainV2.main(AppMainV2.java:114)

Caused by: java.lang.IllegalStateException: Error invoking java.lang.reflect.Method#getAnnotatedReturnType

at net.bytebuddy.description.type.TypeDescription$Generic$AnnotationReader$Dispatcher$ForJava8CapableVm$AnnotatedReturnType.resolve(TypeDescription.java:2998)

at net.bytebuddy.description.type.TypeDescription$Generic$AnnotationReader$Delegator.asList(TypeDescription.java:3252)

at net.bytebuddy.description.type.TypeDescription$Generic$OfNonGenericType$ForLoadedType.getDeclaredAnnotations(TypeDescription.java:4001)

at net.bytebuddy.implementation.attribute.AnnotationAppender$ForTypeAnnotations.apply(AnnotationAppender.java:725)

at net.bytebuddy.implementation.attribute.AnnotationAppender$ForTypeAnnotations.onNonGenericType(AnnotationAppender.java:706)

at net.bytebuddy.implementation.attribute.AnnotationAppender$ForTypeAnnotations.onNonGenericType(AnnotationAppender.java:409)

at net.bytebuddy.description.type.TypeDescription$Generic$OfNonGenericType.accept(TypeDescription.java:3783)

at net.bytebuddy.implementation.attribute.MethodAttributeAppender$ForInstrumentedMethod.apply(MethodAttributeAppender.java:196)

at net.bytebuddy.implementation.attribute.MethodAttributeAppender$Compound.apply(MethodAttributeAppender.java:484)

at net.bytebuddy.dynamic.scaffold.TypeWriter$MethodPool$Record$ForDefinedMethod$WithBody.applyAttributes(TypeWriter.java:701)

at net.bytebuddy.dynamic.scaffold.TypeWriter$MethodPool$Record$ForDefinedMethod$WithBody.applyBody(TypeWriter.java:691)

at net.bytebuddy.dynamic.scaffold.TypeWriter$MethodPool$Record$ForDefinedMethod.apply(TypeWriter.java:600)

at net.bytebuddy.dynamic.scaffold.TypeWriter$Default$ForCreation.create(TypeWriter.java:5751)

at net.bytebuddy.dynamic.scaffold.TypeWriter$Default.make(TypeWriter.java:2166)

at net.bytebuddy.dynamic.scaffold.subclass.SubclassDynamicTypeBuilder.make(SubclassDynamicTypeBuilder.java:232)

at net.bytebuddy.dynamic.scaffold.subclass.SubclassDynamicTypeBuilder.make(SubclassDynamicTypeBuilder.java:204)

at net.bytebuddy.dynamic.DynamicType$Builder$AbstractBase.make(DynamicType.java:3659)

at net.bytebuddy.dynamic.DynamicType$Builder$AbstractBase$Delegator.make(DynamicType.java:3897)

at org.mockito.internal.creation.bytebuddy.SubclassBytecodeGenerator.mockClass(SubclassBytecodeGenerator.java:199)

at org.mockito.internal.creation.bytebuddy.TypeCachingBytecodeGenerator$1.call(TypeCachingBytecodeGenerator.java:46)

at org.mockito.internal.creation.bytebuddy.TypeCachingBytecodeGenerator$1.call(TypeCachingBytecodeGenerator.java:43)

at net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:153)

at net.bytebuddy.TypeCache$WithInlineExpunction.findOrInsert(TypeCache.java:366)

at net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:175)

at net.bytebuddy.TypeCache$WithInlineExpunction.findOrInsert(TypeCache.java:377)

at org.mockito.internal.creation.bytebuddy.TypeCachingBytecodeGenerator.mockClass(TypeCachingBytecodeGenerator.java:36)

at org.mockito.internal.creation.bytebuddy.SubclassByteBuddyMockMaker.createMockType(SubclassByteBuddyMockMaker.java:77)

at org.mockito.internal.creation.bytebuddy.SubclassByteBuddyMockMaker.createMock(SubclassByteBuddyMockMaker.java:43)

at org.mockito.internal.creation.bytebuddy.ByteBuddyMockMaker.createMock(ByteBuddyMockMaker.java:29)

at org.mockito.internal.util.MockUtil.createMock(MockUtil.java:53)

at org.mockito.internal.MockitoCore.mock(MockitoCore.java:61)

at org.mockito.Mockito.mock(Mockito.java:1949)

at org.mockito.Mockito.mock(Mockito.java:1860)

... 71 more

Caused by: java.lang.NullPointerException

at sun.reflect.annotation.TypeAnnotationParser.mapTypeAnnotations(TypeAnnotationParser.java:356)

at sun.reflect.annotation.AnnotatedTypeFactory$AnnotatedTypeBaseImpl.<init>(AnnotatedTypeFactory.java:139)

at sun.reflect.annotation.AnnotatedTypeFactory.buildAnnotatedType(AnnotatedTypeFactory.java:65)

at sun.reflect.annotation.TypeAnnotationParser.buildAnnotatedType(TypeAnnotationParser.java:79)

at java.lang.reflect.Executable.getAnnotatedReturnType0(Executable.java:633)

at java.lang.reflect.Method.getAnnotatedReturnType(Method.java:648)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at net.bytebuddy.description.type.TypeDescription$Generic$AnnotationReader$Dispatcher$ForJava8CapableVm$AnnotatedReturnType.resolve(TypeDescription.java:2994)

... 103 more

Process finished with exit code 255

I found nothing in the migration guide (https://vert-x3.github.io/vertx-4-migration-guide/index.html) and I'm a bit confused because the vert.x Web component is actually using Mockito and mocking the RoutingContext: https://github.com/vert-x3/vertx-web/blob/c4c57e26c70b91da2572629713ade92a54994a1f/vertx-web/src/test/java/io/vertx/ext/web/templ/handlebars/impl/TemplateHandlerImplTest.java#L22

I must be missing something but I can't find it :|

Thanks for your help,

Guillaume

[Guillaume Grossetie]

I cannot reproduce this issue using Java 11.

Maybe I should ask the Mockito core team but I cannot reproduce this issue without Vert.x...

Interestingly, it does not always fail on the same method. For reference, a NullPointerException is thrown when the following code (from byte-buddy) is executed:

try {
  return (AnnotatedElement) getAnnotatedReturnType.invoke(method, NO_ARGUMENTS);
} catch (IllegalAccessException exception) {
  throw new IllegalStateException("Cannot access java.lang.reflect.Method#getAnnotatedReturnType", exception);
} catch (InvocationTargetException exception) {
  throw new IllegalStateException("Error invoking java.lang.reflect.Method#getAnnotatedReturnType", exception.getCause());
}

Most of the time the "method" argument is "public abstract java.lang.Throwable io.vertx.ext.web.RoutingContext.failure()" but not always.

Any ideas or suggestions will be greatly appreciated :) 

Guillaume

[Julien Viet]

I wasn't ever aware some tests using mockito was existing...

it seems indeed to be a Mockito issue.

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[Guillaume Grossetie]

Thanks Julien for your reply.

After further investigation, I found the following discussion/issue: 

- https://groups.google.com/g/mockito/c/nFSc0SjtFDI/m/O5niS1xxBAAJ

- https://github.com/mockito/mockito/issues/366

Apparently, this is a JDK bug (https://bugs.openjdk.java.net/browse/JDK-8152174) which was fixed in Java 9.

Anyway, this is not related to Vertx.

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