springboot使用Junit进行单元测试报错:Could not initialize plugin: interface org.mockito.plugins.MockMaker

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当使用SpringBoot进行Junit单元测试时遇到Mockito插件初始化错误，问题根源可能是bytebuddy包的版本不兼容。解决方法是在pom.xml中指定bytebuddy的版本为1.8.16，从而避免版本冲突，确保Junit测试能正常运行。

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解决方案：在pom.xml文件中加入一下代码

注意：不要去掉版本号-》在spring-boot-starter-parent（version：2.1.6.RELEASE）这个父工程中，已经有以下Jar包,但是版本号不一样，应该是版本不兼容的问题。

	<dependency>
		<groupId>net.bytebuddy</groupId>
		<artifactId>byte-buddy</artifactId>
		<version>1.8.16</version>
	</dependency>
	<dependency>
		<groupId>net.bytebuddy</groupId>
		<artifactId>byte-buddy-agent</artifactId>
		<version>1.8.16</version>
		<scope>test</scope>
	</dependency>

错误详情

1、系统报错信息：

java.lang.IllegalStateException: Could not initialize plugin: interface org.mockito.plugins.MockMaker (alternate: null)
	at org.mockito.internal.configuration.plugins.PluginLoader$1.invoke(PluginLoader.java:74) ~[mockito-core-2.23.4.jar:na]
	at com.sun.proxy.$Proxy43.getHandler(Unknown Source) ~[na:na]
	at org.mockito.internal.util.MockUtil.isMock(MockUtil.java:81) ~[mockito-core-2.23.4.jar:na]
	at org.mockito.internal.util.DefaultMockingDetails.isMock(DefaultMockingDetails.java:32) ~[mockito-core-2.23.4.jar:na]
	at org.springframework.boot.test.mock.mockito.MockReset.get(MockReset.java:106) ~[spring-boot-test-2.1.6.RELEASE.jar:2.1.6.RELEASE]
	at org.springframework.boot.test.mock.mockito.ResetMocksTestExecutionListener.resetMocks(ResetMocksTestExecutionListener.java:81) ~[spring-boot-test-2.1.6.RELEASE.jar:2.1.6.RELEASE]
	at org.springframework.boot.test.mock.mockito.ResetMocksTestExecutionListener.resetMocks(ResetMocksTestExecutionListener.java:69) ~[spring-boot-test-2.1.6.RELEASE.jar:2.1.6.RELEASE]
	at org.springframework.boot.test.mock.mockito.ResetMocksTestExecutionListener.afterTestMethod(ResetMocksTestExecutionListener.java:63) ~[spring-boot-test-2.1.6.RELEASE.jar:2.1.6.RELEASE]
	at org.springframework.test.context.TestContextManager.afterTestMethod(TestContextManager.java:443) ~[spring-test-5.1.8.RELEASE.jar:5.1.8.RELEASE]
	at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:94) [spring-test-5.1.8.RELEASE.jar:5.1.8.RELEASE]
	at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84) [spring-test-5.1.8.RELEASE.jar:5.1.8.RELEASE]
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) [junit-4.12.jar:4.12]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251) [spring-test-5.1.8.RELEASE.jar:5.1.8.RELEASE]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97) [spring-test-5.1.8.RELEASE.jar:5.1.8.RELEASE]
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) [junit-4.12.jar:4.12]
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) [junit-4.12.jar:4.12]
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) [junit-4.12.jar:4.12]
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) [junit-4.12.jar:4.12]
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) [junit-4.12.jar:4.12]
	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) [spring-test-5.1.8.RELEASE.jar:5.1.8.RELEASE]
	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70) [spring-test-5.1.8.RELEASE.jar:5.1.8.RELEASE]
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363) [junit-4.12.jar:4.12]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190) [spring-test-5.1.8.RELEASE.jar:5.1.8.RELEASE]
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86) [.cp/:na]
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) [.cp/:na]
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:538) [.cp/:na]
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760) [.cp/:na]
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460) [.cp/:na]
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206) [.cp/:na]
Caused by: java.lang.NoClassDefFoundError: net/bytebuddy/dynamic/loading/ClassInjector$UsingReflection
	at org.mockito.internal.creation.bytebuddy.SubclassInjectionLoader.<init>(SubclassInjectionLoader.java:28) ~[mockito-core-2.23.4.jar:na]
	at org.mockito.internal.creation.bytebuddy.SubclassByteBuddyMockMaker.<init>(SubclassByteBuddyMockMaker.java:33) ~[mockito-core-2.23.4.jar:na]
	at org.mockito.internal.creation.bytebuddy.ByteBuddyMockMaker.<init>(ByteBuddyMockMaker.java:21) ~[mockito-core-2.23.4.jar:na]
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:na]
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:na]
	at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:na]
	at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:488) ~[na:na]
	at java.base/java.lang.Class.newInstance(Class.java:560) ~[na:na]
	at org.mockito.internal.configuration.plugins.DefaultMockitoPlugins.create(DefaultMockitoPlugins.java:66) ~[mockito-core-2.23.4.jar:na]
	at org.mockito.internal.configuration.plugins.DefaultMockitoPlugins.getDefaultPlugin(DefaultMockitoPlugins.java:43) ~[mockito-core-2.23.4.jar:na]
	at org.mockito.internal.configuration.plugins.PluginLoader.loadPlugin(PluginLoader.java:67) ~[mockito-core-2.23.4.jar:na]
	at org.mockito.internal.configuration.plugins.PluginLoader.loadPlugin(PluginLoader.java:44) ~[mockito-core-2.23.4.jar:na]
	at org.mockito.internal.configuration.plugins.PluginRegistry.<init>(PluginRegistry.java:21) ~[mockito-core-2.23.4.jar:na]
	at org.mockito.internal.configuration.plugins.Plugins.<clinit>(Plugins.java:18) ~[mockito-core-2.23.4.jar:na]
	at org.mockito.internal.util.MockUtil.<clinit>(MockUtil.java:24) ~[mockito-core-2.23.4.jar:na]
	at org.mockito.internal.util.DefaultMockingDetails.isMock(DefaultMockingDetails.java:32) ~[mockito-core-2.23.4.jar:na]
	at org.springframework.boot.test.mock.mockito.MockReset.get(MockReset.java:106) ~[spring-boot-test-2.1.6.RELEASE.jar:2.1.6.RELEASE]
	at org.springframework.boot.test.mock.mockito.ResetMocksTestExecutionListener.resetMocks(ResetMocksTestExecutionListener.java:81) ~[spring-boot-test-2.1.6.RELEASE.jar:2.1.6.RELEASE]
	at org.springframework.boot.test.mock.mockito.ResetMocksTestExecutionListener.resetMocks(ResetMocksTestExecutionListener.java:69) ~[spring-boot-test-2.1.6.RELEASE.jar:2.1.6.RELEASE]
	at org.springframework.boot.test.mock.mockito.ResetMocksTestExecutionListener.beforeTestMethod(ResetMocksTestExecutionListener.java:56) ~[spring-boot-test-2.1.6.RELEASE.jar:2.1.6.RELEASE]
	at org.springframework.test.context.TestContextManager.beforeTestMethod(TestContextManager.java:291) ~[spring-test-5.1.8.RELEASE.jar:5.1.8.RELEASE]
	at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74) ~[spring-test-5.1.8.RELEASE.jar:5.1.8.RELEASE]
	at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86) [spring-test-5.1.8.RELEASE.jar:5.1.8.RELEASE]
	... 19 common frames omitted
Caused by: java.lang.ClassNotFoundException: net.bytebuddy.dynamic.loading.ClassInjector$UsingReflection
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582) ~[na:na]
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:190) ~[na:na]
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:499) ~[na:na]
	... 42 common frames omitted

2、从上面的报错信息大致猜想出应该是：bytebuddy这个包有问题，所以首先在查看自己工程的jar包中有没有这个jar包。打开Maven Dependencies，可以看到在未加上述代码时，项目中已经有这两个jar包了，但是版本不一样。