diff --git a/src/main/java/org/embulk/gradle/embulk_plugins/EmbulkJUnitPlatformTestFramework.java b/src/main/java/org/embulk/gradle/embulk_plugins/EmbulkJUnitPlatformTestFramework.java
index 8b671a7..a1933a3 100644
--- a/src/main/java/org/embulk/gradle/embulk_plugins/EmbulkJUnitPlatformTestFramework.java
+++ b/src/main/java/org/embulk/gradle/embulk_plugins/EmbulkJUnitPlatformTestFramework.java
@@ -59,18 +59,23 @@ public EmbulkJUnitPlatformTestFramework(final DefaultTestFilter filter) {
 
     @Override
     public WorkerTestClassProcessorFactory getProcessorFactory() {
+        final WorkerTestClassProcessorFactory factory;
+
+        factory = super.getProcessorFactory();
+
         /*
-        return super.getProcessorFactory();
-        */
-        if (!JavaVersion.current().isJava8Compatible()) {
-            throw new UnsupportedJavaRuntimeException("Running JUnit Platform requires Java 8+, please configure your test java executable with Java 8 or higher.");
-        }
-        return new EmbulkJUnitPlatformTestClassProcessorFactory(new JUnitPlatformSpec(this.getOptions(),
+        factory = new EmbulkJUnitPlatformTestClassProcessorFactory(new JUnitPlatformSpec(this.getOptions(),
             filter2.getIncludePatterns(), filter2.getExcludePatterns(),
             filter2.getCommandLineIncludePatterns()));
+        */
+
+        System.out.println(factory.getClass());
+        System.out.println(factory.toString());
+
+        return factory;
     }
 
-    static class EmbulkJUnitPlatformTestClassProcessorFactory implements WorkerTestClassProcessorFactory, Serializable {
+    public static class EmbulkJUnitPlatformTestClassProcessorFactory implements WorkerTestClassProcessorFactory, Serializable {
         private final JUnitPlatformSpec spec;
 
         EmbulkJUnitPlatformTestClassProcessorFactory(JUnitPlatformSpec spec) {
@@ -83,8 +88,8 @@ public TestClassProcessor create(ServiceRegistry serviceRegistry) {
                 IdGenerator<?> idGenerator = serviceRegistry.get(IdGenerator.class);
                 Clock clock = serviceRegistry.get(Clock.class);
                 ActorFactory actorFactory = serviceRegistry.get(ActorFactory.class);
-                // Class<?> clazz = getClass().getClassLoader().loadClass("org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor");
-                Class<?> clazz = getClass().getClassLoader().loadClass("org.embulk.gradle.embulk_plugins.EmbulkJUnitPlatformTestClassProcessor");
+                Class<?> clazz = getClass().getClassLoader().loadClass("org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor");
+                // Class<?> clazz = getClass().getClassLoader().loadClass("org.embulk.gradle.embulk_plugins.EmbulkJUnitPlatformTestClassProcessor");
 
                 Constructor<?> constructor = clazz.getConstructor(JUnitPlatformSpec.class, IdGenerator.class, ActorFactory.class, Clock.class);
                 return (TestClassProcessor) constructor.newInstance(spec, idGenerator, actorFactory, clock);
diff --git a/src/main/java/org/embulk/gradle/embulk_plugins/EmbulkPluginTest.java b/src/main/java/org/embulk/gradle/embulk_plugins/EmbulkPluginTest.java
index 7ccdb14..277bb71 100644
--- a/src/main/java/org/embulk/gradle/embulk_plugins/EmbulkPluginTest.java
+++ b/src/main/java/org/embulk/gradle/embulk_plugins/EmbulkPluginTest.java
@@ -39,6 +39,7 @@ public void useEmbulkJUnitPlatform() {
             method.setAccessible(true);
             System.out.println("!");
             method.invoke(this, new EmbulkJUnitPlatformTestFramework((DefaultTestFilter) this.getFilter()));
+            // method.invoke(this, new JUnitPlatformTestFramework((DefaultTestFilter) this.getFilter()));
             System.out.println("?");
         } catch (final IllegalAccessException ex) {
             throw new GradleException("Unexpected failure", ex);
diff --git a/src/test/java/org/embulk/gradle/embulk_plugins/TestSimple.java b/src/test/java/org/embulk/gradle/embulk_plugins/TestSimple.java
index 38196e8..76ea6a0 100644
--- a/src/test/java/org/embulk/gradle/embulk_plugins/TestSimple.java
+++ b/src/test/java/org/embulk/gradle/embulk_plugins/TestSimple.java
@@ -28,6 +28,7 @@
 import org.junit.jupiter.api.condition.DisabledOnOs;
 import org.junit.jupiter.api.condition.OS;
 import org.junit.jupiter.api.io.TempDir;
+import org.junit.jupiter.api.io.CleanupMode;
 
 /**
  * Tests a simple case in the Embulk plugins Gradle plugin.
@@ -40,7 +41,7 @@
 class TestSimple {
     @Test
     @DisabledOnOs(OS.WINDOWS)
-    public void test(@TempDir Path tempDir) throws IOException {
+    public void test(@TempDir(cleanup = CleanupMode.ON_SUCCESS) Path tempDir) throws IOException {
         final Path projectDir = prepareProjectDir(tempDir, "testSimple");
         runGradle(projectDir, "compileJava", "generatePomFileForEmbulkPluginMavenPublication");
 
diff --git a/src/test/resources/testSimple/build.gradle b/src/test/resources/testSimple/build.gradle
index 4bad6bf..07feefe 100644
--- a/src/test/resources/testSimple/build.gradle
+++ b/src/test/resources/testSimple/build.gradle
@@ -21,10 +21,6 @@ tasks.withType(JavaCompile) {
     options.compilerArgs << "-Xlint:unchecked" << "-Xlint:deprecation"
 }
 
-embulkPluginTest {
-    useEmbulkJUnitPlatform()
-}
-
 dependencies {
     compileOnly "org.embulk:embulk-api:0.10.35"
     compileOnly "org.embulk:embulk-spi:0.10.35"
@@ -38,6 +34,8 @@ dependencies {
         exclude group: "*", module: "*"
     }
     implementation "com.github.jnr:jffi:1.2.23:native"
+    testImplementation "org.junit.jupiter:junit-jupiter-api:5.10.1"
+    testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:5.10.1"
 }
 
 embulkPlugin {
@@ -46,6 +44,10 @@ embulkPlugin {
     type = "simple"
 }
 
+embulkPluginTest {
+    useEmbulkJUnitPlatform()
+}
+
 publishing {
     publications {
         embulkPluginMaven(MavenPublication) {