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

[rcornell]

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?

[TimvdLippe]

Could you create an example project that we can debug?

[vpchelko]

Its working if run/debug separate test. But attempt to run multiple tests using "mvn test" or "mvn scalatest:test" failed with MockMaker error:

Java : 1.8
JVM vendor name : Oracle Corporation
JVM vendor version : 25.211-b12
JVM name : Java HotSpot(TM) Client VM
JVM version : 1.8.0_211-b12
JVM info : mixed mode, sharing
OS name : Windows 10
OS version : 10.0
at org.mockito.internal.creation.bytebuddy.InlineByteBuddyMockMaker.(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)
at org.mockito.internal.configuration.plugins.PluginLoader.loadPlugin(PluginLoader.java:45)
at org.mockito.internal.configuration.plugins.PluginRegistry.(PluginRegistry.java:18)
at org.mockito.internal.configuration.plugins.Plugins.(Plugins.java:17)
...
Cause: 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.(InlineByteBuddyMockMaker.java:102)
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)

[vpchelko]

The problem caused by very simple code:

package service

import grizzled.slf4j.Logging
import org.scalatest.FlatSpec
import org.scalatest.mockito.MockitoSugar
import org.Service
//
class ServiceSpec extends FlatSpec with Logging {
val serviceMock = MockitoSugar.mock[Service]
...
}

[Velmurugan-Asokan]

I also have same issue.

Exception in thread "Thread-1" java.lang.IllegalStateException: Could not initialize plugin: interface org.mockito.plugins.MockMaker (alternate: null)
at org.mockito.internal.configuration.plugins.PluginLoader$1.invoke(PluginLoader.java:74)
at com.sun.proxy.$Proxy28.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:241)
at org.mockito.internal.creation.MockSettingsImpl.build(MockSettingsImpl.java:229)
at org.mockito.internal.MockitoCore.mock(MockitoCore.java:62)
at org.mockito.Mockito.mock(Mockito.java:1908)
at org.mockito.Mockito.mock(Mockito.java:1817)
at ----------------------------------------------------------------------------------------
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalStateException: Failed to load interface org.mockito.plugins.MockMaker implementation declared in sun.misc.CompoundEnumeration@474e7097
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.(PluginRegistry.java:22)
at org.mockito.internal.configuration.plugins.Plugins.(Plugins.java:19)
at org.mockito.internal.util.MockUtil.(MockUtil.java:24)
... 8 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 : 25.242-b08
JVM name : OpenJDK 64-Bit Server VM
JVM version : 1.8.0_242-b08
JVM info : mixed mode
OS name : Linux
OS version : 3.10.0-1062.18.1.el7.x86_64

at org.mockito.internal.creation.bytebuddy.InlineByteBuddyMockMaker.<init>(InlineByteBuddyMockMaker.java:170)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at java.lang.Class.newInstance(Class.java:442)
at org.mockito.internal.configuration.plugins.PluginInitializer.loadImpl(PluginInitializer.java:49)
... 13 more

Caused by: java.lang.IllegalStateException: Error during attachment using: net.bytebuddy.agent.ByteBuddyAgent$AttachmentProvider$Compound@6d0aefbf
at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:379)
at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:353)
at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:321)
at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:307)
at org.mockito.internal.creation.bytebuddy.InlineByteBuddyMockMaker.(InlineByteBuddyMockMaker.java:104)
... 19 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at net.bytebuddy.agent.Attacher.install(Attacher.java:84)
at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:374)
... 23 more
Caused by: java.lang.ExceptionInInitializerError
at sun.tools.attach.LinuxAttachProvider.attachVirtualMachine(LinuxAttachProvider.java:63)
at com.sun.tools.attach.VirtualMachine.attach(VirtualMachine.java:208)
... 29 more
Caused by: java.lang.NullPointerException
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1847)
at java.lang.Runtime.loadLibrary0(Runtime.java:871)
at java.lang.System.loadLibrary(System.java:1124)
at sun.tools.attach.LinuxVirtualMachine.(LinuxVirtualMachine.java:342)
... 31 more