Ytukyg

I am using mockito-core-2.7.21 in a maven project and it is working as expected.

But to enable mocking of final class I created a file mockito-extensionsorg.mockito.plugins.MockMaker under my source folder and added the text mock-maker-inline.

As per https://www.baeldung.com/mockito-final and also Mock final class with Mockito 2, it should allow me to mock final classes but when i running my junit test I am getting the below error:

Java Version: 1.8

OS: Windows 10

Junit: 4 and 5(I tried both)

java.lang.IllegalStateException: Could not initialize plugin: interface org.mockito.plugins.MockMaker

    at org.mockito.internal.configuration.plugins.PluginLoader$1.invoke(PluginLoader.java:66)

    at com.sun.proxy.$Proxy7.isTypeMockable(Unknown Source)

    at org.mockito.internal.util.MockUtil.typeMockabilityOf(MockUtil.java:29)

    at org.mockito.internal.util.MockCreationValidator.validateType(MockCreationValidator.java:22)

    at org.mockito.internal.creation.MockSettingsImpl.validatedSettings(MockSettingsImpl.java:186)

    at org.mockito.internal.creation.MockSettingsImpl.confirm(MockSettingsImpl.java:180)

    at org.mockito.internal.MockitoCore.mock(MockitoCore.java:62)

    at org.mockito.Mockito.mock(Mockito.java:1729)

    at org.mockito.Mockito.mock(Mockito.java:1642)

    at siemens.esd.grpc.services.UTCreateModuleServiceTest.testCreateBlockInterface(UTCreateModuleServiceTest.java:29)

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

    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

    at java.lang.reflect.Method.invoke(Unknown Source)

    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)

    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)

    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)

    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)

    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)

    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:89)

    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:41)

    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:541)

    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:763)

    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:463)

    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:209)

Caused by: java.lang.IllegalStateException: Failed to load interface org.mockito.plugins.MockMaker implementation declared in sun.misc.CompoundEnumeration@6f75e721

    at org.mockito.internal.configuration.plugins.PluginLoader.loadImpl(PluginLoader.java:101)

    at org.mockito.internal.configuration.plugins.PluginLoader.loadPlugin(PluginLoader.java:45)

    at org.mockito.internal.configuration.plugins.PluginRegistry.<init>(PluginRegistry.java:18)

    at org.mockito.internal.configuration.plugins.Plugins.<clinit>(Plugins.java:17)

    at org.mockito.internal.configuration.GlobalConfiguration.tryGetPluginAnnotationEngine(GlobalConfiguration.java:55)

    at org.mockito.MockitoAnnotations.initMocks(MockitoAnnotations.java:68)

    at siemens.esd.grpc.services.UTCreateModuleServiceTest.setUp(UTCreateModuleServiceTest.java:22)

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

    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

    at java.lang.reflect.Method.invoke(Unknown Source)

    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)

    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)

    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)

    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)

    ... 15 more

Caused by: org.mockito.exceptions.base.MockitoInitializationException: 

Could not initialize inline Byte Buddy mock maker. (This mock maker is not supported on Android.)



Java               : 1.8

JVM vendor name    : Oracle Corporation

JVM vendor version : 25.181-b13

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

JVM version        : 1.8.0_181-b13

JVM info           : mixed mode

OS name            : Windows 10

OS version         : 10.0



    at org.mockito.internal.creation.bytebuddy.InlineByteBuddyMockMaker.<init>(InlineByteBuddyMockMaker.java:172)

    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)

    at java.lang.reflect.Constructor.newInstance(Unknown Source)

    at java.lang.Class.newInstance(Unknown Source)

    at org.mockito.internal.configuration.plugins.PluginLoader.loadImpl(PluginLoader.java:96)

    ... 29 more

Caused by: java.lang.IllegalStateException: No compatible attachment provider is not available

    at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:347)

    at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:332)

    at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:300)

    at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:286)

    at org.mockito.internal.creation.bytebuddy.InlineByteBuddyMockMaker.<clinit>(InlineByteBuddyMockMaker.java:102)

    ... 35 more

After struggling I found the problem is with the java library available in your java build path.
If you have JRE library in you java build path instead of JDK library then bytebuddy utility is throwing this issue.

Hence the solution to the problem is use JDK library instead of JRE library.