[W7/Java8] Could not initialize plugin: interface org.mockito.plugins.MockMaker

I’ve seen this issue occur in other Issues posted here as well as on StackOverflow, but mine seems particularly weird and none of the other posts’ resolutions have worked for me.

My current project at work has ~80 tests that use Mockito 2.18.3 + Scalatest 3.0.5 together, including the mock-maker-inline config to be able to use the new engine and mock/spy on final classes.

All of the tests run just fine using IntelliJ Idea’s test runner/debugger. When I (locally) run the mvn test lifecycle, since this is what happens in our deployment, all of the tests that use the final class mock fail with the stack below.

I’m importing Mockito in my pom.xml as follows

<dependency>
    <groupId>org.mockito</groupId>
    <artifactId>mockito-core</artifactId>
    <version>2.18.3</version>
</dependency>

Getting the trace below. Any tips would be appreciated.

java.lang.IllegalStateException: Could not initialize plugin: interface org.mockito.plugins.MockMaker (alternate: null)
  at org.mockito.internal.configuration.plugins.PluginLoader$1.invoke(PluginLoader.java:74)
  at com.sun.proxy.$Proxy26.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:232)
  at org.mockito.internal.creation.MockSettingsImpl.build(MockSettingsImpl.java:226)
  at org.mockito.internal.MockitoCore.mock(MockitoCore.java:64)
  at org.mockito.Mockito.mock(Mockito.java:1875)
  at org.mockito.Mockito.mock(Mockito.java:1784)
  at org.scalatest.mockito.MockitoSugar$class.mock(MockitoSugar.scala:73)
  ...
  Cause: java.lang.IllegalStateException: Failed to load interface org.mockito.plugins.MockMaker implementation declared in sun.misc.CompoundEnumeration@2bebb74f
  at org.mockito.internal.configuration.plugins.PluginInitializer.loadImpl(PluginInitializer.java:54)
  at org.mockito.internal.configuration.plugins.PluginLoader.loadPlugin(PluginLoader.java:57)
  at org.mockito.internal.configuration.plugins.PluginLoader.loadPlugin(PluginLoader.java:44)
  at org.mockito.internal.configuration.plugins.PluginRegistry.<init>(PluginRegistry.java:21)
  at org.mockito.internal.configuration.plugins.Plugins.<clinit>(Plugins.java:18)
  at org.mockito.internal.util.MockUtil.<clinit>(MockUtil.java:24)
  at org.mockito.internal.util.MockCreationValidator.validateType(MockCreationValidator.java:22)
  at org.mockito.internal.creation.MockSettingsImpl.validatedSettings(MockSettingsImpl.java:232)
  at org.mockito.internal.creation.MockSettingsImpl.build(MockSettingsImpl.java:226)
  at org.mockito.internal.MockitoCore.mock(MockitoCore.java:64)
  ...
  Cause: 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 : 25.161-b12
JVM name           : Java HotSpot(TM) 64-Bit Server VM
JVM version        : 1.8.0_161-b12
JVM info           : mixed mode
OS name            : Windows 7
OS version         : 6.1
  at org.mockito.internal.creation.bytebuddy.InlineByteBuddyMockMaker.<init>(InlineByteBuddyMockMaker.java:171)
  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.PluginInitializer.loadImpl(PluginInitializer.java:49)
  at org.mockito.internal.configuration.plugins.PluginLoader.loadPlugin(PluginLoader.java:57)
  at org.mockito.internal.configuration.plugins.PluginLoader.loadPlugin(PluginLoader.java:44)
  at org.mockito.internal.configuration.plugins.PluginRegistry.<init>(PluginRegistry.java:21)
  ...
  Cause: java.lang.IllegalStateException: No compatible attachment provider is available
  at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:366)
  at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:351)
  at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:319)
  at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:305)
  at org.mockito.internal.creation.bytebuddy.InlineByteBuddyMockMaker.<clinit>(InlineByteBuddyMockMaker.java:101)
  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)
  ...

[hmedat]

Any updates?

[cuneytykaya]

Hi @rcornell Any update on this issue? Did you find a solution? I get the same error when I use jmockit and mockito-inline together in a project.

Thanks in advance.