Cannot run tests that use Hamcrest

[renatoathaydes]

I wrote this Java test:

package example;

import org.junit.Test;

import static org.hamcrest.CoreMatchers.equalTo;
import static org.junit.Assert.assertThat;

public class JavaTest {
    @Test
    public void test1() {
        assertThat(Main.greetings(), equalTo("Hello. World!"));
    }
}

As you probably know, JUnit depends on hamcrest (partial output of gradle depend):

testRuntimeClasspath - Runtime classpath of source set 'test'.
\--- junit:junit:4.12
     \--- org.hamcrest:hamcrest-core:1.3

So this should work, I think.

[renatoathaydes]

The stacktrace:

java.lang.IllegalAccessError: class example.JavaTest (in module simple.main) cannot access class org.hamcrest.CoreMatchers (in module hamcrest.core) because module simple.main does not read module hamcrest.core
	at simple.main/example.JavaTest.test1(JavaTest.java:11)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:564)
	at junit@4.12/org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at junit@4.12/org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at junit@4.12/org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at junit@4.12/org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at junit@4.12/org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at junit@4.12/org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at junit@4.12/org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
	at junit@4.12/org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at junit@4.12/org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at junit@4.12/org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at junit@4.12/org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at junit@4.12/org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at junit@4.12/org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.runTestClass(JUnitTestClassExecutor.java:106)
	at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:58)
	at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:38)
	at org.gradle.api.internal.tasks.testing.junit.AbstractJUnitTestClassProcessor.processTestClass(AbstractJUnitTestClassProcessor.java:66)
	at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:51)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:564)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
	at org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:32)
	at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:93)
	at com.sun.proxy.$Proxy1.processTestClass(Unknown Source)
	at org.gradle.api.internal.tasks.testing.worker.TestWorker.processTestClass(TestWorker.java:109)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:564)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
	at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:155)
	at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:137)
	at org.gradle.internal.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:404)
	at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63)
	at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:46)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1135)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55)
	at java.base/java.lang.Thread.run(Thread.java:844)

[renatoathaydes]

Hm... even using only JUnit, I get an error... are you sure this plugin supports running JUnit tests?

I can only run JUnit tests when I add this to the build file:

test {
    doFirst {
        jvmArgs += [
                '--add-exports', "simple.main/example=junit",
        ]
    }
}

Interestingly, I was able to run my original Hamcrest test with adding this:

test {
    doFirst {
        jvmArgs += [
                '--add-exports', "simple.main/example=junit",
                '--add-reads', "simple.main=hamcrest.core",
        ]
    }
}

Maybe you could generate these --add-exports and --add-reads automatically?