diff --git a/spring-core/src/main/java/org/springframework/core/ParameterizedTypeReference.java b/spring-core/src/main/java/org/springframework/core/ParameterizedTypeReference.java
index 0191deae128..1953bddc3b9 100644
--- a/spring-core/src/main/java/org/springframework/core/ParameterizedTypeReference.java
+++ b/spring-core/src/main/java/org/springframework/core/ParameterizedTypeReference.java
@@ -42,7 +42,7 @@ import org.springframework.util.Assert;
  * @param <T> the referenced type
  * @see <a href="https://gafter.blogspot.nl/2006/12/super-type-tokens.html">Neal Gafter on Super Type Tokens</a>
  */
-public abstract class ParameterizedTypeReference<T> {
+public abstract class ParameterizedTypeReference<T extends @Nullable Object> {
 
 	private final Type type;
 
diff --git a/spring-messaging/src/test/kotlin/org/springframework/messaging/rsocket/RSocketRequesterExtensionsTests.kt b/spring-messaging/src/test/kotlin/org/springframework/messaging/rsocket/RSocketRequesterExtensionsTests.kt
index 49940f57044..1ab94cddf0e 100644
--- a/spring-messaging/src/test/kotlin/org/springframework/messaging/rsocket/RSocketRequesterExtensionsTests.kt
+++ b/spring-messaging/src/test/kotlin/org/springframework/messaging/rsocket/RSocketRequesterExtensionsTests.kt
@@ -107,35 +107,35 @@ class RSocketRequesterExtensionsTests {
 	suspend fun retrieveAndAwait() {
 		val response = "foo"
 		val retrieveSpec = mockk<RSocketRequester.RetrieveSpec>()
-		every { retrieveSpec.retrieveMono(match<ParameterizedTypeReference<*>>(stringTypeRefMatcher)) } returns Mono.just("foo")
+		every { retrieveSpec.retrieveMono(match<ParameterizedTypeReference<String>>(stringTypeRefMatcher)) } returns Mono.just("foo")
 		assertThat(retrieveSpec.retrieveAndAwait<String>()).isEqualTo(response)
 	}
 
 	@Test
 	suspend fun retrieveAndAwaitOrNull() {
 		val retrieveSpec = mockk<RSocketRequester.RetrieveSpec>()
-		every { retrieveSpec.retrieveMono(match<ParameterizedTypeReference<*>>(stringTypeRefMatcher)) } returns Mono.empty()
+		every { retrieveSpec.retrieveMono(match<ParameterizedTypeReference<String>>(stringTypeRefMatcher)) } returns Mono.empty()
 		assertThat(retrieveSpec.retrieveAndAwaitOrNull<String>()).isNull()
 	}
 
 	@Test
 	suspend fun retrieveFlow() {
 		val retrieveSpec = mockk<RSocketRequester.RetrieveSpec>()
-		every { retrieveSpec.retrieveFlux(match<ParameterizedTypeReference<*>>(stringTypeRefMatcher)) } returns Flux.just("foo", "bar")
+		every { retrieveSpec.retrieveFlux(match<ParameterizedTypeReference<String>>(stringTypeRefMatcher)) } returns Flux.just("foo", "bar")
 		assertThat(retrieveSpec.retrieveFlow<String>().toList()).contains("foo", "bar")
 	}
 
 	@Test
 	fun retrieveMono() {
 		val retrieveSpec = mockk<RSocketRequester.RetrieveSpec>()
-		every { retrieveSpec.retrieveMono(match<ParameterizedTypeReference<*>>(stringTypeRefMatcher)) } returns Mono.just("foo")
+		every { retrieveSpec.retrieveMono(match<ParameterizedTypeReference<String>>(stringTypeRefMatcher)) } returns Mono.just("foo")
 		assertThat(retrieveSpec.retrieveMono<String>().block()).isEqualTo("foo")
 	}
 
 	@Test
 	fun retrieveFlux() {
 		val retrieveSpec = mockk<RSocketRequester.RetrieveSpec>()
-		every { retrieveSpec.retrieveFlux(match<ParameterizedTypeReference<*>>(stringTypeRefMatcher)) } returns Flux.just("foo", "bar")
+		every { retrieveSpec.retrieveFlux(match<ParameterizedTypeReference<String>>(stringTypeRefMatcher)) } returns Flux.just("foo", "bar")
 		assertThat(retrieveSpec.retrieveFlux<String>().collectList().block()).contains("foo", "bar")
 	}
 }
diff --git a/spring-test/src/main/java/org/springframework/test/web/reactive/server/WebTestClient.java b/spring-test/src/main/java/org/springframework/test/web/reactive/server/WebTestClient.java
index 05654d676fe..7a3b1e75e17 100644
--- a/spring-test/src/main/java/org/springframework/test/web/reactive/server/WebTestClient.java
+++ b/spring-test/src/main/java/org/springframework/test/web/reactive/server/WebTestClient.java
@@ -900,13 +900,13 @@ public interface WebTestClient {
 		 * List-specific assertions.
 		 * @param elementType the expected List element type
 		 */
-		<E> ListBodySpec<E> expectBodyList(Class<E> elementType);
+		<E extends @Nullable Object> ListBodySpec<E> expectBodyList(Class<E> elementType);
 
 		/**
 		 * Alternative to {@link #expectBodyList(Class)} that accepts information
 		 * about a target type with generics.
 		 */
-		<E> ListBodySpec<E> expectBodyList(ParameterizedTypeReference<E> elementType);
+		<E extends @Nullable Object> ListBodySpec<E> expectBodyList(ParameterizedTypeReference<E> elementType);
 
 		/**
 		 * Consume and decode the response body to {@code byte[]} and then apply
diff --git a/spring-test/src/main/kotlin/org/springframework/test/web/reactive/server/WebTestClientExtensions.kt b/spring-test/src/main/kotlin/org/springframework/test/web/reactive/server/WebTestClientExtensions.kt
index e6900204d91..24cf9c13125 100644
--- a/spring-test/src/main/kotlin/org/springframework/test/web/reactive/server/WebTestClientExtensions.kt
+++ b/spring-test/src/main/kotlin/org/springframework/test/web/reactive/server/WebTestClientExtensions.kt
@@ -75,7 +75,7 @@ inline fun <reified B : Any> ResponseSpec.expectBody(): BodySpec<B, *> =
  * @author Sebastien Deleuze
  * @since 5.0
  */
-inline fun <reified E : Any> ResponseSpec.expectBodyList(): ListBodySpec<E> =
+inline fun <reified E : Any?> ResponseSpec.expectBodyList(): ListBodySpec<E> =
 		expectBodyList(object : ParameterizedTypeReference<E>() {})
 
 /**
diff --git a/spring-test/src/test/kotlin/org/springframework/test/web/reactive/server/WebTestClientExtensionsTests.kt b/spring-test/src/test/kotlin/org/springframework/test/web/reactive/server/WebTestClientExtensionsTests.kt
index 252ce31ca36..e7247f62c15 100644
--- a/spring-test/src/test/kotlin/org/springframework/test/web/reactive/server/WebTestClientExtensionsTests.kt
+++ b/spring-test/src/test/kotlin/org/springframework/test/web/reactive/server/WebTestClientExtensionsTests.kt
@@ -23,6 +23,7 @@ import org.assertj.core.api.Assertions.assertThat
 import org.junit.jupiter.api.Test
 import org.reactivestreams.Publisher
 import org.springframework.core.ParameterizedTypeReference
+import org.springframework.http.MediaType
 import org.springframework.web.reactive.function.server.router
 import java.util.concurrent.CompletableFuture
 
@@ -95,6 +96,14 @@ class WebTestClientExtensionsTests {
 		verify { responseSpec.expectBodyList(object : ParameterizedTypeReference<Foo>() {}) }
 	}
 
+	@Test
+	fun `ResponseSpec#expectBodyList with null value`() {
+		WebTestClient
+			.bindToRouterFunction( router { GET("/") { ok().contentType(MediaType.APPLICATION_JSON).bodyValue("[null]") } } )
+			.build()
+			.get().uri("/").exchange().expectBodyList<Foo?>().hasSize(0)
+	}
+
 	@Test
 	fun `ResponseSpec#returnResult with reified type parameters`() {
 		responseSpec.returnResult<Foo>()