Mockito fails with inlined mocks enabled with Invalid paramter name exception

java junit mockito byte-buddy
mekazu picture mekazu · Dec 19, 2017 · Viewed 12.7k times · Source

I've enabled inlined mocks so that I can mock final classes but now I get the following exception when running tests with Junit.

When I run all the tests at once only two tests fail, but if I run tests individually then most of them fail.

I'm not using any scala or android classes (that I'm aware of). I am using lombok but I tried removing lombok annotations any it didn't fix the problem.

When removing mock-maker-inline the problem goes away, but I'd rather keep it.

How should I address this problem?

org.mockito.exceptions.base.MockitoException: 
Mockito cannot mock this class: class com.example.MyClass.

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 : 25.112-b15
JVM name           : Java HotSpot(TM) 64-Bit Server VM
JVM version        : 1.8.0_112-b15
JVM info           : mixed mode
OS name            : Windows 10
OS version         : 10.0


You are seeing this disclaimer because Mockito is configured to create inlined mocks.
You can learn about inline mocks and their limitations under item #39 of the Mockito class javadoc.

Underlying exception : org.mockito.exceptions.base.MockitoException: Could not modify all classes [interface java.lang.AutoCloseable, class com.example.MyClass, interface java.io.Closeable, class java.lang.Object]
    at org.mockito.internal.junit.JUnitRule$1.evaluate(JUnitRule.java:42)
    at org.junit.rules.ExpectedException$ExpectedExceptionStatement.evaluate(ExpectedException.java:239)
    at org.junit.rules.RunRules.evaluate(RunRules.java:20)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:539)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:761)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:461)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:207)
Caused by: org.mockito.exceptions.base.MockitoException: Could not modify all classes [interface java.lang.AutoCloseable, class com.example.MyClass, interface java.io.Closeable, class java.lang.Object]
    at net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:138)
    at net.bytebuddy.TypeCache$WithInlineExpunction.findOrInsert(TypeCache.java:346)
    at net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:161)
    at net.bytebuddy.TypeCache$WithInlineExpunction.findOrInsert(TypeCache.java:355)
    ... 18 more
Caused by: java.lang.IllegalStateException: 
Byte Buddy could not instrument all classes within the mock's type hierarchy

This problem should never occur for javac-compiled classes. This problem has been observed for classes that are:
 - Compiled by older versions of scalac
 - Classes that are part of the Android distribution
    at org.mockito.internal.creation.bytebuddy.InlineBytecodeGenerator.triggerRetransformation(InlineBytecodeGenerator.java:120)
    at org.mockito.internal.creation.bytebuddy.InlineBytecodeGenerator.mockClass(InlineBytecodeGenerator.java:97)
    at org.mockito.internal.creation.bytebuddy.TypeCachingBytecodeGenerator$1.call(TypeCachingBytecodeGenerator.java:37)
    at org.mockito.internal.creation.bytebuddy.TypeCachingBytecodeGenerator$1.call(TypeCachingBytecodeGenerator.java:34)
    at net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:138)
    at net.bytebuddy.TypeCache$WithInlineExpunction.findOrInsert(TypeCache.java:346)
    at net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:161)
    at net.bytebuddy.TypeCache$WithInlineExpunction.findOrInsert(TypeCache.java:355)
    at org.mockito.internal.creation.bytebuddy.TypeCachingBytecodeGenerator.mockClass(TypeCachingBytecodeGenerator.java:32)
    at org.mockito.internal.creation.bytebuddy.InlineByteBuddyMockMaker.createMockType(InlineByteBuddyMockMaker.java:200)
    at org.mockito.internal.creation.bytebuddy.InlineByteBuddyMockMaker.createMock(InlineByteBuddyMockMaker.java:181)
    at org.mockito.internal.util.MockUtil.createMock(MockUtil.java:35)
    at org.mockito.internal.MockitoCore.mock(MockitoCore.java:65)
    at org.mockito.Mockito.mock(Mockito.java:1821)
    at org.mockito.internal.configuration.MockAnnotationProcessor.process(MockAnnotationProcessor.java:36)
    at org.mockito.internal.configuration.MockAnnotationProcessor.process(MockAnnotationProcessor.java:16)
    at org.mockito.internal.configuration.IndependentAnnotationEngine.createMockFor(IndependentAnnotationEngine.java:38)
    at org.mockito.internal.configuration.IndependentAnnotationEngine.process(IndependentAnnotationEngine.java:62)
    at org.mockito.internal.configuration.InjectingAnnotationEngine.processIndependentAnnotations(InjectingAnnotationEngine.java:57)
    at org.mockito.internal.configuration.InjectingAnnotationEngine.process(InjectingAnnotationEngine.java:41)
    at org.mockito.MockitoAnnotations.initMocks(MockitoAnnotations.java:69)
    ... 18 more
Caused by: java.lang.IllegalStateException: Error invoking java.lang.reflect.Executable#getParameters
    at net.bytebuddy.description.method.ParameterDescription$ForLoadedParameter$Dispatcher$ForJava8CapableVm.getParameter(ParameterDescription.java:387)
    at net.bytebuddy.description.method.ParameterDescription$ForLoadedParameter$Dispatcher$ForJava8CapableVm.isNamePresent(ParameterDescription.java:355)
    at net.bytebuddy.description.method.ParameterDescription$ForLoadedParameter.isNamed(ParameterDescription.java:227)
    at net.bytebuddy.description.method.ParameterDescription$AbstractBase.asToken(ParameterDescription.java:147)
    at net.bytebuddy.description.method.ParameterDescription$AbstractBase.asToken(ParameterDescription.java:107)
    at net.bytebuddy.description.method.ParameterList$AbstractBase.asTokenList(ParameterList.java:80)
    at net.bytebuddy.description.method.MethodDescription$AbstractBase.asToken(MethodDescription.java:693)
    at net.bytebuddy.description.method.MethodDescription$AbstractBase.asToken(MethodDescription.java:334)
    at net.bytebuddy.description.method.MethodList$AbstractBase.asTokenList(MethodList.java:53)
    at net.bytebuddy.dynamic.scaffold.InstrumentedType$Factory$Default$1.represent(InstrumentedType.java:223)
    at net.bytebuddy.ByteBuddy.redefine(ByteBuddy.java:698)
    at net.bytebuddy.ByteBuddy.redefine(ByteBuddy.java:676)
    at org.mockito.internal.creation.bytebuddy.InlineBytecodeGenerator.transform(InlineBytecodeGenerator.java:167)
    at sun.instrument.TransformerManager.transform(TransformerManager.java:188)
    at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:428)
    at sun.instrument.InstrumentationImpl.retransformClasses0(Native Method)
    at sun.instrument.InstrumentationImpl.retransformClasses(InstrumentationImpl.java:144)
    at org.mockito.internal.creation.bytebuddy.InlineBytecodeGenerator.triggerRetransformation(InlineBytecodeGenerator.java:117)
    ... 38 more
Caused by: java.lang.reflect.MalformedParametersException: Invalid parameter name ""
    at java.lang.reflect.Executable.verifyParameters(Executable.java:386)
    at java.lang.reflect.Executable.privateGetParameters(Executable.java:416)
    at java.lang.reflect.Executable.getParameters(Executable.java:357)
    at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at net.bytebuddy.description.method.ParameterDescription$ForLoadedParameter$Dispatcher$ForJava8CapableVm.getParameter(ParameterDescription.java:383)
    ... 55 more

Using mockito-core 2.13.0 and byte-buddy 1.7.9.

Answer

DroidT picture DroidT · Apr 3, 2019

I got around this by upgrading to the latest version of mockito. Currently it is:

testImplementation "org.mockito:mockito-core:2.25.1"

After that I had some build errors which was resolved by selecting 

File->Invalidate Caches / Restart...

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