Eclipse IDE - JUnit5 test runner is picked instead of JUnit4

[blacelle]

I open a maven multi-module project in Eclipse 2024-12 (though it happens since multiple previous Eclipse versions).

My maven projects brings dependencies:

• org.junit.vintage:junit-vintage-engine:5.10.3
• org.junit.plateform:junit-plateform-engine:1.10.3
• org.junit.plateform:junit-plateform-commons:1.10.3
• junit:junit:4.13.2

And nothing matching jupiter.

But Eclipse Test Runner is automatically configured on JUnit5, which fails with stacks like:

org.junit.platform.commons.JUnitException: TestEngine with ID 'junit-jupiter' failed to discover tests
	at org.junit.platform.launcher.core.EngineDiscoveryOrchestrator.discoverEngineRoot(EngineDiscoveryOrchestrator.java:160)
	at org.junit.platform.launcher.core.EngineDiscoveryOrchestrator.discoverSafely(EngineDiscoveryOrchestrator.java:132)
	at org.junit.platform.launcher.core.EngineDiscoveryOrchestrator.discover(EngineDiscoveryOrchestrator.java:107)
	at org.junit.platform.launcher.core.EngineDiscoveryOrchestrator.discover(EngineDiscoveryOrchestrator.java:78)
	at org.junit.platform.launcher.core.DefaultLauncher.discover(DefaultLauncher.java:99)
	at org.junit.platform.launcher.core.DefaultLauncher.discover(DefaultLauncher.java:77)
	at org.junit.platform.launcher.core.DelegatingLauncher.discover(DelegatingLauncher.java:42)
	at org.junit.platform.launcher.core.SessionPerRequestLauncher.discover(SessionPerRequestLauncher.java:56)
	at org.eclipse.jdt.internal.junit5.runner.JUnit5TestReference.<init>(JUnit5TestReference.java:47)
	at org.eclipse.jdt.internal.junit5.runner.JUnit5TestLoader.createUnfilteredTest(JUnit5TestLoader.java:88)
	at org.eclipse.jdt.internal.junit5.runner.JUnit5TestLoader.createTest(JUnit5TestLoader.java:69)
	at org.eclipse.jdt.internal.junit5.runner.JUnit5TestLoader.loadTests(JUnit5TestLoader.java:56)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:514)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:758)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:453)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:211)
Caused by: org.junit.platform.commons.JUnitException: ClassSelector [className = 'io.mitrust.sharing.TestClaimsDeprecationHelper', classLoader = jdk.internal.loader.ClassLoaders$AppClassLoader@1e2e2406] resolution failed
	at org.junit.platform.launcher.listeners.discovery.AbortOnFailureLauncherDiscoveryListener.selectorProcessed(AbortOnFailureLauncherDiscoveryListener.java:39)
	at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolveCompletely(EngineDiscoveryRequestResolution.java:103)
	at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.run(EngineDiscoveryRequestResolution.java:83)
	at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolver.resolve(EngineDiscoveryRequestResolver.java:113)
	at org.junit.jupiter.engine.discovery.DiscoverySelectorResolver.resolveSelectors(DiscoverySelectorResolver.java:48)
	at org.junit.jupiter.engine.JupiterTestEngine.discover(JupiterTestEngine.java:69)
	at org.junit.platform.launcher.core.EngineDiscoveryOrchestrator.discoverEngineRoot(EngineDiscoveryOrchestrator.java:152)
	... 15 more
Caused by: java.lang.NoSuchMethodError: 'boolean org.junit.platform.commons.util.ReflectionUtils.returnsPrimitiveVoid(java.lang.reflect.Method)'
	at org.junit.jupiter.engine.discovery.predicates.IsTestableMethod.test(IsTestableMethod.java:48)
	at org.junit.jupiter.engine.discovery.predicates.IsTestMethod.test(IsTestMethod.java:23)
	at org.junit.jupiter.engine.discovery.predicates.IsTestableMethod.test(IsTestableMethod.java:26)
	at java.base/java.util.function.Predicate.lambda$or$2(Predicate.java:101)
	at java.base/java.util.function.Predicate.lambda$or$2(Predicate.java:101)
	at org.junit.platform.commons.util.ReflectionUtils.findMethod(ReflectionUtils.java:1410)
	at org.junit.platform.commons.util.ReflectionUtils.isMethodPresent(ReflectionUtils.java:1306)
	at org.junit.jupiter.engine.discovery.predicates.IsTestClassWithTests.hasTestOrTestFactoryOrTestTemplateMethods(IsTestClassWithTests.java:50)
	at org.junit.jupiter.engine.discovery.predicates.IsTestClassWithTests.test(IsTestClassWithTests.java:46)
	at org.junit.jupiter.engine.discovery.ClassSelectorResolver.resolve(ClassSelectorResolver.java:67)
	at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.lambda$resolve$2(EngineDiscoveryRequestResolution.java:135)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
	at java.base/java.util.ArrayList$ArrayListSpliterator.tryAdvance(ArrayList.java:1685)
	at java.base/java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:129)
	at java.base/java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:527)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:513)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
	at java.base/java.util.stream.FindOps$FindOp.evaluateSequential(FindOps.java:150)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.base/java.util.stream.ReferencePipeline.findFirst(ReferencePipeline.java:647)
	at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolve(EngineDiscoveryRequestResolution.java:189)
	at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolve(EngineDiscoveryRequestResolution.java:126)
	at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolveCompletely(EngineDiscoveryRequestResolution.java:92)
	... 20 more

Steps to reproduce

This happens on a complex private multi-module project. I could try making a simpler repository if necessary.

Context

• Used versions (Jupiter/Vintage/Platform): 1.10.3
• Build Tool/IDE: Eclipse 2024-12

https://bugs.eclipse.org/bugs/show_bug.cgi?id=578100

---

Should I look for a specific dependency to understand why JUnit5 kicks-in?

[sormuras]

Please use the JUnit BOM in your Maven POM to align all versions of JUnit artifacts. It seems like Eclipse is providing the wrong version of Jupiter engine when running tests.

Find more details here: https://junit.org/junit5/docs/current/user-guide/#running-tests-build-maven-bom

See also:

• Latest version of jupiter causes JVM to not be able to start JUnit due to missing method #3933
• Raise awareness of version upgrade strategies #3935

PS: And if Eclipse (and others) would run JUnit on the module path, we would be able to spot the version mismatch right in the stacktrace.

[blacelle]

Please use the JUnit BOM in your Maven POM to align all versions of JUnit artifacts. It seems like Eclipse is providing the wrong version of Jupiter engine when running tests.

The project essentially do:

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.7.18</version>
		<!-- http://stackoverflow.com/questions/6003831/parent-relativepath-points-at-my-com-mycompanymyproject-instead-of-org-apache -->
		<relativePath />
	</parent>

	<properties>
		<!-- JUnit4 latest is 4.13.2 -->
		<!-- Still, we can upgrade the BOM for latest utilities-->
		<junit-jupiter.version>5.10.3</junit-jupiter.version>
	</properties>


				<plugin>
					<groupId>org.apache.maven.plugins</groupId>
					<artifactId>maven-surefire-plugin</artifactId>
					<version>3.5.2</version>
					<configuration>
						<argLine><![CDATA[-Xmx256M -XX:+StartAttachListener -Djava.util.logging.config.file=logging.properties -Djdk.attach.allowAttachSelf=true ${surefire.additionalArgument} ${argLine}]]></argLine>
					</configuration>
				</plugin>

which looks acceptable regarding the user-guide.

I upgraded to:

<junit-jupiter.version>5.11.4</junit-jupiter.version>

and this issue is fixed!

TY

---

PS: And if Eclipse (and others) would run JUnit on the module path, we would be able to spot the version mismatch right in the stacktrace.

Do you mean Eclipse does something wrong, or my pom.xml does something wrong?

[sormuras]

...
and this issue is fixed!

In the light of this, I'm closing this issue.

Ah, Spring Boot is in the mix, too. What you now have looks similar to what the docs state: https://junit.org/junit5/docs/current/user-guide/#running-tests-build-spring-boot

Do you mean Eclipse does something wrong, or my pom.xml does something wrong?

As long as mvn works as expected on the command line, your pom.xml should be fine. Using the same Maven project declaration imported into Eclipse and it see it fail? Then something's off in Eclipse.

What I was refering to is that you get version information for granted, from explicit modules mounted on the module path. For example:

Failures (1):
  JUnit Jupiter:JUnitTests:test()
    MethodSource [className = 'test.junit.JUnitTests', methodName = 'test', methodParameterTypes = '']
    => org.opentest4j.AssertionFailedError
       org.junit.jupiter.api@5.11.4/org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:34)
       org.junit.jupiter.api@5.11.4/org.junit.jupiter.api.Assertions.fail(Assertions.java:119)
       test.junit@2024-ea/test.junit.JUnitTests.test(JUnitTests.java:9)

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