JDK 16 & InaccessibleObjectException

Expected Behavior

I upgraded to JDK16 & Gradle 7 and I have issues when running mockk:

// method for mocking timestamps
fun mockNow(string: String) {
    mockkStatic(Instant::class, ZonedDateTime::class, LocalDate::class, LocalDateTime::class)
    every { Instant.now() }.returns(instantOf(string))
    every { ZonedDateTime.now() }.returns(zonedDateTimeOf(string))
}

mockNow("2020-01-01T12:00:00Z")

Will fail with:

java.time.format.DateTimeParseException: Text '2020-01-01T12:00:00Z' could not be parsed: Unable to make private static java.time.LocalDate java.time.LocalDate.create(int,int,int) accessible: module java.base does not "opens java.time" to unnamed module @7254bd8e
        at java.base/java.time.format.DateTimeFormatter.createError(DateTimeFormatter.java:2023)
        at java.base/java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1958)
        at java.base/java.time.ZonedDateTime.parse(ZonedDateTime.java:600)

(see full stacktrace below)

Current Behavior

We currently use JDK11 where this works correctly.

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: 1.12.0
• OS: Any
• Kotlin version: 1.5.30-RC
• JDK version: 16
• JUnit version: 5.7.0
• Type of test: unit test

Full stacktrace

java.time.format.DateTimeParseException: Text '2020-01-01T12:00:00Z' could not be parsed: Unable to make private static java.time.LocalDate java.time.LocalDate.create(int,int,int) accessible: module java.base does not "opens java.time" to unnamed module @7254bd8e
        at java.base/java.time.format.DateTimeFormatter.createError(DateTimeFormatter.java:2023)
        at java.base/java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1958)
        at java.base/java.time.ZonedDateTime.parse(ZonedDateTime.java:600)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:567)
        at io.mockk.proxy.jvm.advice.MethodCall.call(MethodCall.kt:14)
        at io.mockk.proxy.jvm.advice.SelfCallEliminatorCallable.call(SelfCallEliminatorCallable.kt:14)
        at io.mockk.impl.instantiation.JvmMockFactoryHelper.handleOriginalCall(JvmMockFactoryHelper.kt:95)
        at io.mockk.impl.instantiation.JvmMockFactoryHelper.access$handleOriginalCall(JvmMockFactoryHelper.kt:18)
        at io.mockk.impl.instantiation.JvmMockFactoryHelper$mockHandler$1$invocation$$inlined$stdFunctions$lambda$1.invoke(JvmMockFactoryHelper.kt:27)
        at io.mockk.impl.stub.MockKStub$handleInvocation$originalPlusToString$1.invoke(MockKStub.kt:230)
        at io.mockk.impl.stub.SpyKStub.defaultAnswer(SpyKStub.kt:15)
        at io.mockk.impl.stub.MockKStub.answer(MockKStub.kt:42)
        at io.mockk.impl.recording.states.AnsweringState.call(AnsweringState.kt:16)
        at io.mockk.impl.recording.CommonCallRecorder.call(CommonCallRecorder.kt:53)
        at io.mockk.impl.stub.MockKStub.handleInvocation(MockKStub.kt:266)
        at io.mockk.impl.instantiation.JvmMockFactoryHelper$mockHandler$1.invocation(JvmMockFactoryHelper.kt:23)
        at io.mockk.proxy.jvm.advice.Interceptor.call(Interceptor.kt:21)
        at java.base/java.time.ZonedDateTime.parse(ZonedDateTime.java:600)
        at java.base/java.time.ZonedDateTime.parse(ZonedDateTime.java:585)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:567)
        at io.mockk.proxy.jvm.advice.MethodCall.call(MethodCall.kt:14)
        at io.mockk.proxy.jvm.advice.SelfCallEliminatorCallable.call(SelfCallEliminatorCallable.kt:14)
        at io.mockk.impl.instantiation.JvmMockFactoryHelper.handleOriginalCall(JvmMockFactoryHelper.kt:95)
        at io.mockk.impl.instantiation.JvmMockFactoryHelper.access$handleOriginalCall(JvmMockFactoryHelper.kt:18)
        at io.mockk.impl.instantiation.JvmMockFactoryHelper$mockHandler$1$invocation$$inlined$stdFunctions$lambda$1.invoke(JvmMockFactoryHelper.kt:27)
        at io.mockk.impl.stub.MockKStub$handleInvocation$originalPlusToString$1.invoke(MockKStub.kt:230)
        at io.mockk.impl.stub.SpyKStub.defaultAnswer(SpyKStub.kt:15)
        at io.mockk.impl.stub.MockKStub.answer(MockKStub.kt:42)
        at io.mockk.impl.recording.states.AnsweringState.call(AnsweringState.kt:16)
        at io.mockk.impl.recording.CommonCallRecorder.call(CommonCallRecorder.kt:53)
        at io.mockk.impl.stub.MockKStub.handleInvocation(MockKStub.kt:266)
        at io.mockk.impl.instantiation.JvmMockFactoryHelper$mockHandler$1.invocation(JvmMockFactoryHelper.kt:23)
        at io.mockk.proxy.jvm.advice.Interceptor.call(Interceptor.kt:21)
        at java.base/java.time.ZonedDateTime.parse(ZonedDateTime.java:585)
        at net.goout.instant.InstantUtilsKt.zonedDateTimeOf(InstantUtils.kt:63)
        at net.goout.instant.InstantUtilsKt.instantOf(InstantUtils.kt:79)
        at net.goout.instant.InstantTestUtilsKt.mockNow(InstantTestUtils.kt:14)
        at net.goout.instant.InstantUtilsTest.testMockNow(InstantUtilsTest.kt:24)

[knyttl]

tasks.test {
        …
        // https://github.com/mockk/mockk/issues/681
        jvmArgs("--add-opens", "java.base/java.time=ALL-UNNAMED")
}

[timkante]

You can fix this issue on your own.

To the java Test-Process, add --add-opens java.base/java.time=ALL-UNNAMED as start-argument and it’ll work. Here is the corresponding JEP for reference: https://openjdk.java.net/jeps/396

If you’d have shared your grade config, as required by the issue-template, I could tell you exactly, but as you did not provide it, you’ll have to figure out where exactly to add it on your own.

This is not a bug in MockK.