MockK 导致 StackOverflowException

Question

如题！我无法运行任何使用 MockK 的测试，因为它们最终会在初始化期间抛出 StackOverflowError 。

作为一个例子，这是我的一个测试类：

@ExtendWith(MockKExtension::class)
class DBSequencesServicesTest {
    private lateinit var service: DBSequencesService

    @MockK
    private lateinit var sequencesRepo: DBSequencesRepo

    @BeforeTest
    fun initService() {
        service = DBSequencesServiceImpl(sequencesRepo)
    }

    @Test
    fun `should return value 0 if given a non-existent sequence`() {
        every { sequencesRepo.findById(any()) } returns Optional.empty()
        assertEquals(0, service.nextValue("test"))
    }

    @Test
    fun `should return next value if given an existing sequence`() {
        every { sequencesRepo.findById("test") } returns Optional.of(DBSequence("test", 1))
        every { sequencesRepo.save(any()) } returnsArgument 0
        assertEquals(1, service.nextValue("test"))
    }

    @Test
    fun `successive calls should return incrementing values`() {
        every { sequencesRepo.findById("test") } returnsMany listOf(
            Optional.of(DBSequence("test", 0)),
            Optional.of(DBSequence("test", 1)),
            Optional.of(DBSequence("test", 2))
        )
        every { sequencesRepo.save(any()) } returnsArgument 0

        for (i in 0L..2L) {
            assertEquals(i, service.nextValue("test"))
        }
    }
}

这是产生的堆栈跟踪，一旦模式变得明显就被切断：

Exception in thread "Test worker" java/lang/StackOverflowError
    at io/mockk/proxy/jvm/dispatcher/JvmMockKDispatcher.get (JvmMockKDispatcher.java:16)
    at java/lang/Object.hashCode (Object.java:119)
    at java/util/HashMap.hash (HashMap.java:339)
    at java/util/HashMap.get (HashMap.java:557)
    at sun/reflect/Reflection.filterMethods (Reflection.java:291)
    at java/lang/Class.getMethodHelper (Class.java:1265)
    at java/lang/Class.getMethod (Class.java:1191)
    at java/lang/Object.hashCode (Object.java:119)
    at java/util/HashMap.hash (HashMap.java:339)
    at java/util/HashMap.get (HashMap.java:557)
    at sun/reflect/Reflection.filterMethods (Reflection.java:291)
    at java/lang/Class.getMethodHelper (Class.java:1265)
    at java/lang/Class.getMethod (Class.java:1191)
    at java/lang/Object.hashCode (Object.java:119)
    at java/util/HashMap.hash (HashMap.java:339)
    at java/util/HashMap.get (HashMap.java:557)
    at sun/reflect/Reflection.filterMethods (Reflection.java:291)
    at java/lang/Class.getMethodHelper (Class.java:1265)
    at java/lang/Class.getMethod (Class.java:1191)
    at java/lang/Object.hashCode (Object.java:119)
    at java/util/HashMap.hash (HashMap.java:339)
    at java/util/HashMap.get (HashMap.java:557)
    ...

然后抛出 MessageIOException：

org.gradle.internal.remote.internal.MessageIOException: Could not read message from '/127.0.0.1:52775'.
    at org.gradle.internal.remote.internal.inet.SocketConnection.receive(SocketConnection.java:94)
    at org.gradle.internal.remote.internal.hub.MessageHub$ConnectionReceive.run(MessageHub.java:270)
    at org.gradle.internal.concurrent.ExecutorPolicy$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:821)

据我所知，我已经正确设置了 MockK 并按照他们的指南使用它：

dependencies {
    // Other dependencies go here...
    testImplementation("org.springframework.boot:spring-boot-starter-test") {
        exclude(group = "org.junit.vintage", module = "junit-vintage-engine")
    }
    testImplementation("org.springframework.security:spring-security-test")
    testImplementation("org.jetbrains.kotlin:kotlin-test-junit5:1.4.10")
    testImplementation("io.mockk:mockk:1.10.2")
    testImplementation("com.ninja-squad:springmockk:2.0.3")
}

是什么导致了该异常，我该如何解决它？如果需要更多背景信息，请告诉我。

编辑：当 CircleCI 使用图像运行测试时，不会发生相同的异常cimg/openjdk:8.0

编辑2：添加了DBSequence和的定义DBSequenceRepo

@Document(collection = "dbSequences")
data class DBSequence(
    @Id var name: String,
    var nextVal: Long
) {

    override fun equals(other: Any?): Boolean {
        if (this === other) return true
        if (javaClass != other?.javaClass) return false

        other as DBSequence

        if (name != other.name) return false

        return true
    }

    override fun hashCode(): Int {
        return name.hashCode()
    }
}

interface DBSequencesRepo : MongoRepository<DBSequence, String>

Answer 1

在mock中有一个与该问题相关的未决问题。该错误会在 JVM 变体的子集上重现。我想您本地已经安装了这样的 JVM 之一。作为解决方法，您可以尝试在本地安装不同的 JVM 发行版。根据上面的链接，“AdoptOpenJDK: 1.8.0_222 hotspot”似乎可以。