Prerequisites

• I am running the latest version
• I checked the documentation and found no answer
• I checked to make sure that this issue has not already been filed

Expected Behavior

Mocking a static method

Failure Information (for bugs)

java.lang.ExceptionInInitializerError
at my.package.ConfigUseCaseTests.getConfigs_fromJson(ConfigUseCaseTests.kt:33)
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 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$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$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)
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 com.intellij.rt.execution.application.AppMainV2.main(AppMainV2.java:131)
Caused by: io.mockk.MockKException: Failed to load plugin io.mockk.proxy.jvm.JvmMockKAgentFactory
at io.mockk.impl.JvmMockKGateway.(JvmMockKGateway.kt:152)
at io.mockk.impl.JvmMockKGateway.(JvmMockKGateway.kt:138)
... 29 more
Caused by: java.lang.IllegalStateException: Error during attachment using: net.bytebuddy.agent.ByteBuddyAgent$AttachmentProvider$Compound@1c72da34
at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:377)
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 io.mockk.proxy.jvm.MockKInstrumentation.(MockKInstrumentation.java:57)
at io.mockk.proxy.jvm.JvmMockKAgentFactory.(JvmMockKAgentFactory.java:11)
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 io.mockk.impl.JvmMockKGateway.(JvmMockKGateway.kt:150)
... 30 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:77)
at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:372)
... 41 more
Caused by: java.lang.NullPointerException
at com.sun.tools.attach.VirtualMachine.attach(VirtualMachine.java:187)
... 47 more

Context

Please provide any relevant information about your setup. This is important in case the issue is not reproducible except for under certain conditions.

• MockK version: 1.8.0
• OS: Mac OS High Sierra
• Kotlin version: 1.2.30
• JDK version: 1.8.0_161
• Type of test: unit test

Minimal reproducible code (the gist of this issue)

// These are some of the Gradle implementations.
    // Power Mockito
    testImplementation 'org.powermock:powermock-api-mockito:1.6.1'
    testImplementation 'org.powermock:powermock-module-junit4-rule-agent:1.6.1'
    testImplementation 'org.powermock:powermock-module-junit4-rule:1.6.1'
    testImplementation 'org.powermock:powermock-module-junit4:1.6.1'

    // Mockk
    testImplementation "io.mockk:mockk:1.8"

    // Mockito
    def mockitoVersion = "1.5.0"
    testImplementation "org.mockito:mockito-core:$mockitoVersion"
    testImplementation "com.nhaarman:mockito-kotlin-kt1.1:$mockitoVersion"
    androidTestImplementation("com.nhaarman:mockito-kotlin-kt1.1:$mockitoVersion", {
        exclude group: 'org.mockito', module: 'mockito-core'
    })
    androidTestImplementation 'org.mockito:mockito-android:2.11.0'

    class ConfigUseCaseTests : UnitTestsResource() {
    
        private lateinit var configUseCase: ConfigUseCase
    
        @Before
        override fun setUp() {
            super.setUp()
            configUseCase = ConfigUseCase()
        }
    
        @Test
        fun getConfigs_fromJson() {
            objectMockk(SharedPreferencesHelper).mock()
            every { SharedPreferencesHelper.loadString(isA(), isA(), isA(), isA()) } returns "wooo"
            System.out.println("String:${SharedPreferencesHelper.loadString(context, "", "", null)}")
        }
    }

I've also tested it with staticMockk or any other examples provided but I'm getting the same error.