diff --git a/src/docs/antora/modules/ROOT/pages/documentation.adoc b/src/docs/antora/modules/ROOT/pages/documentation.adoc
index 4d1be19cc..c91b46886 100644
--- a/src/docs/antora/modules/ROOT/pages/documentation.adoc
+++ b/src/docs/antora/modules/ROOT/pages/documentation.adoc
@@ -37,7 +37,7 @@ Kotlin::
 [source, kotlin, role="secondary"]
 ----
 class DocumentationTests {
-    private val modules = ApplicationModules.of(Application::class)
+    private val modules = ApplicationModules.of(Application::class.java)
 
     @Test
     fun writeDocumentationSnippets() {
@@ -238,7 +238,7 @@ Kotlin::
 ----
 class DocumentationTests {
 
-  private val modules = ApplicationModules.of(Application::class)
+  private val modules = ApplicationModules.of(Application::class.java)
 
   @Test
   fun writeDocumentationSnippets() {
diff --git a/src/docs/antora/modules/ROOT/pages/events.adoc b/src/docs/antora/modules/ROOT/pages/events.adoc
index 3d7d1d0f7..0742e61a3 100644
--- a/src/docs/antora/modules/ROOT/pages/events.adoc
+++ b/src/docs/antora/modules/ROOT/pages/events.adoc
@@ -425,7 +425,7 @@ class ExternalizationConfiguration {
 
     return EventExternalizationConfiguration.externalizing()                 // <1>
       .select(EventExternalizationConfiguration.annotatedAsExternalized())   // <2>
-      .mapping(SomeEvent.class, it -> …)                                     // <3>
+      .mapping(SomeEvent.class, event -> …)                                  // <3>
       .routeKey(WithKeyProperty.class, WithKeyProperty::getKey)              // <4>
       .build();
   }
@@ -443,8 +443,8 @@ class ExternalizationConfiguration {
 
     EventExternalizationConfiguration.externalizing()                         // <1>
       .select(EventExternalizationConfiguration.annotatedAsExternalized())    // <2>
-      .mapping(SomeEvent::class, it -> …)                                     // <3>
-      .routeKey(WithKeyProperty::class, WithKeyProperty::getKey)              // <4>
+      .mapping(SomeEvent::class.java) { event -> … }                           // <3>
+      .routeKey(WithKeyProperty::class.java, WithKeyProperty::getKey)         // <4>
       .build()
   }
 }
@@ -501,7 +501,7 @@ class OrderIntegrationTests {
   fun someTestMethod(events: PublishedEvents events) {
 
     // …
-    var matchingMapped = events.ofType(OrderCompleted::class)
+    val matchingMapped = events.ofType(OrderCompleted::class.java)
       .matching(OrderCompleted::getOrderId, reference.getId())
 
     assertThat(matchingMapped).hasSize(1)
@@ -546,7 +546,7 @@ class OrderIntegrationTests {
 
     // …
     assertThat(events)
-      .contains(OrderCompleted::class)
+      .contains(OrderCompleted::class.java)
       .matching(OrderCompleted::getOrderId, reference.getId())
   }
 }
diff --git a/src/docs/antora/modules/ROOT/pages/fundamentals.adoc b/src/docs/antora/modules/ROOT/pages/fundamentals.adoc
index 0ecd7429d..1a5ee16f0 100644
--- a/src/docs/antora/modules/ROOT/pages/fundamentals.adoc
+++ b/src/docs/antora/modules/ROOT/pages/fundamentals.adoc
@@ -122,7 +122,7 @@ Kotlin::
 +
 [source, kotlin, role="secondary"]
 ----
-var modules = ApplicationModules.of(Application::class)
+var modules = ApplicationModules.of(Application::class.java)
 ----
 ======
 To get an impression of what the analyzed arrangement looks like, we can just write the individual modules contained in the overall model to the console:
diff --git a/src/docs/antora/modules/ROOT/pages/testing.adoc b/src/docs/antora/modules/ROOT/pages/testing.adoc
index aa2069580..135bd03bd 100644
--- a/src/docs/antora/modules/ROOT/pages/testing.adoc
+++ b/src/docs/antora/modules/ROOT/pages/testing.adoc
@@ -179,7 +179,7 @@ Kotlin::
 scenario.publish(MyApplicationEvent(…)).…
 
 // Start with a bean invocation
-scenario.stimulate(() -> someBean.someMethod(…)).…
+scenario.stimulate(Runnable { someBean.someMethod(…) }).…
 ----
 ======
 
@@ -263,9 +263,9 @@ Kotlin::
 [source, kotlin, role="secondary"]
 ----
 scenario.publish(new MyApplicationEvent(…))
-  .andWaitForEventOfType(SomeOtherEvent::class)
-  .matching(event -> …)
-  .toArriveAndVerify(event -> …)
+  .andWaitForEventOfType(SomeOtherEvent::class.java)
+  .matching { event -> … }
+  .toArriveAndVerify { event -> … }
 ----
 ======
 
@@ -287,9 +287,9 @@ Kotlin::
 +
 [source, kotlin, role="secondary"]
 ----
-scenario.publish(new MyApplicationEvent(…))
-  .andWaitForStateChange(() -> someBean.someMethod(…)))
-  .andVerify(result -> …)
+scenario.publish(MyApplicationEvent(…))
+  .andWaitForStateChange { someBean.someMethod(…) }
+  .andVerify { result -> … }
 ----
 ======
 
@@ -310,7 +310,7 @@ Java::
 [source, java, subs="+quotes", role="primary"]
 ----
 scenario.publish(new MyApplicationEvent(…))
-  **.customize(it -> it.atMost(Duration.ofSeconds(2)))**
+  **.customize(conditionFactory -> conditionFactory.atMost(Duration.ofSeconds(2)))**
   .andWaitForEventOfType(SomeOtherEvent.class)
   .matching(event -> …)
   .toArriveAndVerify(event -> …);
@@ -320,10 +320,10 @@ Kotlin::
 [source, kotlin, subs="+quotes", role="secondary"]
 ----
 scenario.publish(MyApplicationEvent(…))
-  **.customize(it -> it.atMost(Duration.ofSeconds(2)))**
-  .andWaitForEventOfType(SomeOtherEvent::class)
-  .matching(event -> …)
-  .toArriveAndVerify(event -> …)
+  **.customize { it.atMost(Duration.ofSeconds(2)) }**
+  .andWaitForEventOfType(SomeOtherEvent::class.java)
+  .matching { event -> … }
+  .toArriveAndVerify { event -> … }
 ----
 ======
 
@@ -348,7 +348,7 @@ class MyTests {
 
     @Override
     Function<ConditionFactory, ConditionFactory> getDefaultCustomizer(Method method, ApplicationContext context) {
-      return it -> …;
+      return conditionFactory -> …;
     }
   }
 }
@@ -361,14 +361,14 @@ Kotlin::
 class MyTests {
 
   @Test
-  fun myTestCase(scenario : Scenario) {
+  fun myTestCase(scenario: Scenario) {
     // scenario will be pre-customized with logic defined in MyCustomizer
   }
 
   class MyCustomizer : ScenarioCustomizer {
 
-    override fun getDefaultCustomizer(method : Method, context : ApplicationContext) : Function<ConditionFactory, ConditionFactory> {
-      return it -> …
+    override fun getDefaultCustomizer(method: Method, context: ApplicationContext): UnaryOperator<ConditionFactory> {
+      return UnaryOperator { conditionFactory -> … }
     }
   }
 }
diff --git a/src/docs/antora/modules/ROOT/pages/verification.adoc b/src/docs/antora/modules/ROOT/pages/verification.adoc
index 871f63ace..4555a71ee 100644
--- a/src/docs/antora/modules/ROOT/pages/verification.adoc
+++ b/src/docs/antora/modules/ROOT/pages/verification.adoc
@@ -16,7 +16,7 @@ Kotlin::
 +
 [source, kotlin, role="secondary"]
 ----
-ApplicationModules.of(Application::class).verify()
+ApplicationModules.of(Application::class.java).verify()
 ----
 ======
 The verification includes the following rules: