Mockito-Mockito无法模拟此类-IllegalArgumentException：无法创建类型

Question

我在一次测试中试图使用一个模拟类，但出现了以下错误：

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

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 : 25.161-b12
JVM name           : Java HotSpot(TM) Client VM
JVM version        : 1.8.0_161-b12
JVM info           : mixed mode, sharing
OS name            : Windows 10
OS version         : 10.0


Underlying exception : java.lang.IllegalArgumentException: Could not create type

at org.mockito.internal.runners.DefaultInternalRunner$1$1.evaluate(DefaultInternalRunner.java:43)
at org.junit.rules.ExpectedException$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.mockito.internal.runners.DefaultInternalRunner$1.run(DefaultInternalRunner.java:74)
at org.mockito.internal.runners.DefaultInternalRunner.run(DefaultInternalRunner.java:80)
at org.mockito.internal.runners.StrictRunner.run(StrictRunner.java:39)
at org.mockito.junit.MockitoJUnitRunner.run(MockitoJUnitRunner.java:163)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: java.lang.IllegalArgumentException: Could not create type
at net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:139)
at net.bytebuddy.TypeCache$WithInlineExpunction.findOrInsert(TypeCache.java:344)
at net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:159)
at net.bytebuddy.TypeCache$WithInlineExpunction.findOrInsert(TypeCache.java:353)
at org.mockito.internal.creation.bytebuddy.TypeCachingBytecodeGenerator.mockClass(TypeCachingBytecodeGenerator.java:32)
at org.mockito.internal.creation.bytebuddy.SubclassByteBuddyMockMaker.createMockType(SubclassByteBuddyMockMaker.java:71)
at org.mockito.internal.creation.bytebuddy.SubclassByteBuddyMockMaker.createMock(SubclassByteBuddyMockMaker.java:42)
at org.mockito.internal.creation.bytebuddy.ByteBuddyMockMaker.createMock(ByteBuddyMockMaker.java:25)
at org.mockito.internal.util.MockUtil.createMock(MockUtil.java:35)
at org.mockito.internal.MockitoCore.mock(MockitoCore.java:62)
at org.mockito.Mockito.mock(Mockito.java:1908)
at org.mockito.internal.configuration.MockAnnotationProcessor.processAnnotationForMock(MockAnnotationProcessor.java:44)
at org.mockito.internal.configuration.MockAnnotationProcessor.process(MockAnnotationProcessor.java:19)
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:49)
at org.mockito.internal.configuration.InjectingAnnotationEngine.process(InjectingAnnotationEngine.java:41)
at org.mockito.MockitoAnnotations.initMocks(MockitoAnnotations.java:69)
... 21 more
Caused by: java.lang.NoSuchMethodError: net.bytebuddy.dynamic.loading.MultipleParentClassLoader$Builder.appendMostSpecific(Ljava/util/Collection;)Lnet/bytebuddy/dynamic/loading/MultipleParentClassLoader$Builder;
at org.mockito.internal.creation.bytebuddy.SubclassBytecodeGenerator.mockClass(SubclassBytecodeGenerator.java:83)
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:137)
... 39 more

在pom中：

     <dependency>
        <groupId>org.mockito</groupId>
        <artifactId>mockito-core</artifactId>
        <version>2.28.2</version>
        <scope>test</scope>
    </dependency>

（也试用了3.0.0版）

车辆等级：

public class Car{

  // Some properties. Non of them is final / static.

 // constructor
}

测试类：

@RunWith(MockitoJUnitRunner.class)
public class ParkinglotTest{

@Mock
private Car car;

private Parkinglog parkinglot;

@Before
 public void setUp(){
    parkinglot = new Parkinglot(car);
}


....

Answer 1

在降级Mockito版本后，我能够修复该问题：

<代码>

Answer 2

在我的例子中，这是因为它引用的是另一个版本的byte-buddy，它实际上与mockito库不兼容。

这个附加版本的byte好友，来自hibernate-core（版本5.3.7），它也存在于我的类路径中。

最初，我使用的是mockito-core库version-3.3.3，它实际上需要byte-Buddy 1.10.5。

因此，我将mockito核心库降级为2.21.0版本，该版本使用byte buddy版本1.8.15。

它开始对我起作用了。

对我来说，另一个解决方案是更新到更新版本的hibernate（版本

但这可能会对项目产生更大的影响，所以我选择了第一个解决方案，具体如下，具体取决于您使用的库：

    <dependency>
        <groupId>org.mockito</groupId>
        <artifactId>mockito-junit-jupiter</artifactId>
        <version>2.21.0</version>
        <scope>test</scope>
    </dependency>

或

    <dependency>
        <groupId>org.mockito</groupId>
        <artifactId>mockito-core</artifactId>
        <version>2.21.0</version>
        <scope>test</scope>
    </dependency>

此外，这个问题在这里得到了解决：https://github.com/mockito/mockito/issues/1606帮助我找到了解决方案。

Answer 3

似乎这可能是因为找不到安装的bytebuddy，指的是：

原因：java。lang.NoSuchMethodError:net。拜特巴迪。动态加载。MultipleParentClassLoader$生成器。appendMostSpecific（Ljava/util/Collection；）Lnet/bytebuddy/dynamic/loading/MultipleParentClassLoader$Builder；

从我在网上找到的内容来看，将bytebuddy添加到依赖项可能会解决这个问题。

    <dependency>
      <groupId>net.bytebuddy</groupId>
      <artifactId>byte-buddy</artifactId>
      <version>XXX</version>
    </dependency>