title: org.junit.platform.commons.JUnitException: TestEngine with ID 'junit-jupiter' failed to discover tests
body: <p>I wan to implement a Junit 5 test into Gradle project. I tried this:</p>
  <p><em><strong>Gradle configuration:</strong></em></p>
  <pre><code>plugins {
      id 'org.springframework.boot' version '2.5.5'
      id 'io.spring.dependency-management' version '1.0.11.RELEASE'
      id 'java'
  }
  
  group = 'test'
  version = '0.0.1'
  sourceCompatibility = '17'
  
  repositories {
      mavenCentral()
  }
  
  ext {
      set('springCloudVersion', &quot;2020.0.4&quot;)
  }
  
  dependencies {
      ...............
      testImplementation 'org.springframework.boot:spring-boot-starter-test'
      testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.2'
      testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.2'
  }
  
  dependencyManagement {
      imports {
          mavenBom &quot;org.springframework.cloud:spring-cloud-dependencies:${springCloudVersion}&quot;
      }
  }
  
  test {
      useJUnitPlatform()
  }
  </code></pre>
  <p><em><strong>Junit test:</strong></em></p>
  <pre><code>import org.junit.jupiter.api.DisplayName;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.Timeout;
  
  import java.util.concurrent.TimeUnit;
  
  public class GeneratePdf {
  
      @DisplayName(&quot;Test MessageService.get()&quot;)
      @Test
      @Timeout(value = 60, unit = TimeUnit.SECONDS)
      public void generatePdfFileTes() throws InterruptedException
      {
          System.out.println(&quot;test!&quot;);
      }
  
  }
  </code></pre>
  <p>When I run the code I get error:</p>
  <pre><code>Internal Error occurred.
  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:134)
      at org.junit.platform.launcher.core.EngineDiscoveryOrchestrator.discover(EngineDiscoveryOrchestrator.java:108)
      at org.junit.platform.launcher.core.EngineDiscoveryOrchestrator.discover(EngineDiscoveryOrchestrator.java:80)
      at org.junit.platform.launcher.core.DefaultLauncher.discover(DefaultLauncher.java:110)
      at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:86)
      at org.junit.platform.launcher.core.DefaultLauncherSession$DelegatingLauncher.execute(DefaultLauncherSession.java:86)
      at org.junit.platform.launcher.core.SessionPerRequestLauncher.execute(SessionPerRequestLauncher.java:53)
      at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:71)
      at com.intellij.rt.junit.IdeaTestRunner$Repeater$1.execute(IdeaTestRunner.java:38)
      at com.intellij.rt.execution.junit.TestsRepeater.repeat(TestsRepeater.java:11)
      at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:35)
      at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:235)
      at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54)
  Caused by: org.junit.platform.commons.JUnitException: MethodSelector [className = 'org.merchant.poc.GeneratePdf', methodName = 'generatePdfFileTes', methodParameterTypes = ''] 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:102)
      at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.run(EngineDiscoveryRequestResolution.java:82)
      at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolver.resolve(EngineDiscoveryRequestResolver.java:113)
      at org.junit.jupiter.engine.discovery.DiscoverySelectorResolver.resolveSelectors(DiscoverySelectorResolver.java:46)
      at org.junit.jupiter.engine.JupiterTestEngine.discover(JupiterTestEngine.java:69)
      at org.junit.platform.launcher.core.EngineDiscoveryOrchestrator.discoverEngineRoot(EngineDiscoveryOrchestrator.java:152)
      ... 13 more
  Caused by: org.junit.platform.commons.PreconditionViolationException: Could not load class with name: org.merchant.poc.GeneratePdf
      at org.junit.platform.engine.discovery.MethodSelector.lambda$lazyLoadJavaClass$0(MethodSelector.java:157)
      at org.junit.platform.commons.function.Try$Failure.getOrThrow(Try.java:335)
      at org.junit.platform.engine.discovery.MethodSelector.lazyLoadJavaClass(MethodSelector.java:156)
      at org.junit.platform.engine.discovery.MethodSelector.getJavaClass(MethodSelector.java:135)
      at org.junit.jupiter.engine.discovery.MethodSelectorResolver.resolve(MethodSelectorResolver.java:73)
      at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.lambda$resolve$2(EngineDiscoveryRequestResolution.java:146)
      at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
      at java.base/java.util.ArrayList$ArrayListSpliterator.tryAdvance(ArrayList.java:1602)
      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$FindOp.evaluateSequential(FindOps.java:150)
      at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
      at java.base/java.util.stream.ReferencePipeline.findFirst(ReferencePipeline.java:647)
      at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolve(EngineDiscoveryRequestResolution.java:185)
      at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolve(EngineDiscoveryRequestResolution.java:125)
      at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolveCompletely(EngineDiscoveryRequestResolution.java:91)
      ... 18 more
  Caused by: java.lang.ClassNotFoundException: org.merchant.poc.GeneratePdf
      at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
      at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
      at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
      at org.junit.platform.commons.util.ReflectionUtils.lambda$tryToLoadClass$9(ReflectionUtils.java:829)
      at org.junit.platform.commons.function.Try.lambda$call$0(Try.java:57)
      at org.junit.platform.commons.function.Try.of(Try.java:93)
      at org.junit.platform.commons.function.Try.call(Try.java:57)
      at org.junit.platform.commons.util.ReflectionUtils.tryToLoadClass(ReflectionUtils.java:792)
      at org.junit.platform.commons.util.ReflectionUtils.tryToLoadClass(ReflectionUtils.java:748)
      ... 34 more
  </code></pre>
  <p>Do you know how this issue can be fixed?</p>
  <p><em><strong>EDIT:</strong></em></p>
  <pre><code>import org.junit.jupiter.api.Test;
  
  public class InvoiceTests {
  
      @Test
      public void generateTest()
      {
          System.out.println(&quot;test!&quot;);
      }
  
  }
  </code></pre>
  <p>I tried this but again it's not working.</p>