java - 使用Mockk模拟Java静态方法时，附件ByteBuddyAgent发生错误

Question

我正在研究gradle项目，尝试在使用Mockk模拟Java静态方法时进行单元测试。我的单元测试只是尝试模拟静态类。尝试进行一些研究时，有人说这是ByteBuddyAgent问题，但我不确定该问题是否相同以及是否有任何解决方法。提前致谢。

class UtilsTest {
 @Before
    fun setup() {
        mockkStatic(UtilKotlin::class)
    }

    @Test
    fun invFirstReturnsItem() {
        Assert.assertTrue(true)
    }
}

而且我得到了错误:

java.lang.ExceptionInInitializerError
    at tribot.utils.UtilsTest.setup(UtilsTest.kt:28)
    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.RunBefores.evaluate(RunBefores.java:24)
    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$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.runTestClass(JUnitTestClassExecutor.java:110)
    at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:58)
    at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:38)
    at org.gradle.api.internal.tasks.testing.junit.AbstractJUnitTestClassProcessor.processTestClass(AbstractJUnitTestClassProcessor.java:62)
    at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:51)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
    at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
    at org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:33)
    at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:94)
    at com.sun.proxy.$Proxy2.processTestClass(Unknown Source)
    at org.gradle.api.internal.tasks.testing.worker.TestWorker.processTestClass(TestWorker.java:118)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
    at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
    at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:182)
    at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:164)
    at org.gradle.internal.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:412)
    at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
    at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalStateException: Error during attachment using: net.bytebuddy.agent.ByteBuddyAgent$AttachmentProvider$Compound@399c2f7f
    at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:613)
    at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:586)
    at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:538)
    at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:515)
    at io.mockk.proxy.jvm.JvmMockKAgentFactory.initInstrumentation(JvmMockKAgentFactory.kt:134)
    at io.mockk.proxy.jvm.JvmMockKAgentFactory.init(JvmMockKAgentFactory.kt:34)
    at io.mockk.impl.JvmMockKGateway.<init>(JvmMockKGateway.kt:46)
    at io.mockk.impl.JvmMockKGateway.<clinit>(JvmMockKGateway.kt:172)
    ... 48 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:106)
    at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:608)
    ... 55 more
Caused by: com.sun.tools.attach.AttachNotSupportedException: no providers installed
    at com.sun.tools.attach.VirtualMachine.attach(VirtualMachine.java:55)
    ... 61 more

这是我的build.gradle文件

plugins {
   id 'java'
   id 'org.jetbrains.kotlin.jvm' version '1.3.72'
}

group 'org.example'
version '1.0-SNAPSHOT'


repositories {
    mavenCentral()
    mavenLocal()
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
    testImplementation group: 'junit', name: 'junit', version: '4.12'
    testImplementation "io.mockk:mockk:1.10.0"
}

compileKotlin {
    kotlinOptions.jvmTarget = "1.8"
}

compileTestKotlin {
    kotlinOptions.jvmTarget = "1.8"
}

Answer 1

原因在堆栈的底部:com.sun.tools.attach.AttachNotSupportedException:未安装任何提供程序
似乎您没有使用完整的JDK来运行测试，这通常是导致此问题的原因，因为JRE出厂时没有提供某些工具二进制文件。您正在使用哪种Java安装？