diff --git a/spring-web/src/main/java/org/springframework/http/codec/AbstractJacksonDecoder.java b/spring-web/src/main/java/org/springframework/http/codec/AbstractJacksonDecoder.java
index 3a5270dfe5c..63314e1b1a5 100644
--- a/spring-web/src/main/java/org/springframework/http/codec/AbstractJacksonDecoder.java
+++ b/spring-web/src/main/java/org/springframework/http/codec/AbstractJacksonDecoder.java
@@ -102,14 +102,7 @@ public abstract class AbstractJacksonDecoder<T extends ObjectMapper> extends Jac
 
 	@Override
 	public boolean canDecode(ResolvableType elementType, @Nullable MimeType mimeType) {
-		if (!supportsMimeType(mimeType)) {
-			return false;
-		}
-		T mapper = selectMapper(elementType, mimeType);
-		if (mapper == null) {
-			return false;
-		}
-		return !CharSequence.class.isAssignableFrom(elementType.toClass());
+		return supportsMimeType(mimeType) && (selectMapper(elementType, mimeType) != null);
 	}
 
 	@Override
diff --git a/spring-web/src/main/java/org/springframework/http/codec/AbstractJacksonEncoder.java b/spring-web/src/main/java/org/springframework/http/codec/AbstractJacksonEncoder.java
index 79f58b01a70..4a11813550c 100644
--- a/spring-web/src/main/java/org/springframework/http/codec/AbstractJacksonEncoder.java
+++ b/spring-web/src/main/java/org/springframework/http/codec/AbstractJacksonEncoder.java
@@ -126,14 +126,11 @@ public abstract class AbstractJacksonEncoder<T extends ObjectMapper> extends Jac
 		if (this.mapperRegistrations != null && selectMapper(elementType, mimeType) == null) {
 			return false;
 		}
-		Class<?> clazz = elementType.resolve();
-		if (clazz == null) {
-			return true;
-		}
-		if (MappingJacksonValue.class.isAssignableFrom(clazz)) {
+		Class<?> elementClass = elementType.toClass();
+		if (MappingJacksonValue.class.isAssignableFrom(elementClass)) {
 			throw new UnsupportedOperationException("MappingJacksonValue is not supported, use hints instead");
 		}
-		return !String.class.isAssignableFrom(clazz);
+		return !ServerSentEvent.class.isAssignableFrom(elementClass);
 	}
 
 	@Override
diff --git a/spring-web/src/main/java/org/springframework/http/codec/json/JacksonJsonDecoder.java b/spring-web/src/main/java/org/springframework/http/codec/json/JacksonJsonDecoder.java
index e0feef2f812..73cb908d6fe 100644
--- a/spring-web/src/main/java/org/springframework/http/codec/json/JacksonJsonDecoder.java
+++ b/spring-web/src/main/java/org/springframework/http/codec/json/JacksonJsonDecoder.java
@@ -104,6 +104,11 @@ public class JacksonJsonDecoder extends AbstractJacksonDecoder<JsonMapper> {
 		super(mapper, mimeTypes);
 	}
 
+	@Override
+	public boolean canDecode(ResolvableType elementType, @Nullable MimeType mimeType) {
+		return super.canDecode(elementType, mimeType) && !CharSequence.class.isAssignableFrom(elementType.toClass());
+	}
+
 	@Override
 	protected Flux<DataBuffer> processInput(Publisher<DataBuffer> input, ResolvableType elementType,
 			@Nullable MimeType mimeType, @Nullable Map<String, Object> hints) {
diff --git a/spring-web/src/main/java/org/springframework/http/codec/json/JacksonJsonEncoder.java b/spring-web/src/main/java/org/springframework/http/codec/json/JacksonJsonEncoder.java
index 74251313171..e8a14d01b03 100644
--- a/spring-web/src/main/java/org/springframework/http/codec/json/JacksonJsonEncoder.java
+++ b/spring-web/src/main/java/org/springframework/http/codec/json/JacksonJsonEncoder.java
@@ -121,6 +121,11 @@ public class JacksonJsonEncoder extends AbstractJacksonEncoder<JsonMapper> {
 	}
 
 
+	@Override
+	public boolean canEncode(ResolvableType elementType, @Nullable MimeType mimeType) {
+		return super.canEncode(elementType, mimeType) && !String.class.isAssignableFrom(elementType.toClass());
+	}
+
 	@Override
 	protected List<MimeType> getMediaTypesForProblemDetail() {
 		return problemDetailMimeTypes;
diff --git a/spring-web/src/test/java/org/springframework/http/codec/cbor/JacksonCborDecoderTests.java b/spring-web/src/test/java/org/springframework/http/codec/cbor/JacksonCborDecoderTests.java
index f60033da3df..dbb7111de3e 100644
--- a/spring-web/src/test/java/org/springframework/http/codec/cbor/JacksonCborDecoderTests.java
+++ b/spring-web/src/test/java/org/springframework/http/codec/cbor/JacksonCborDecoderTests.java
@@ -57,7 +57,7 @@ class JacksonCborDecoderTests extends AbstractDecoderTests<JacksonCborDecoder> {
 		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo.class), MediaType.APPLICATION_CBOR)).isTrue();
 		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo.class), null)).isTrue();
 
-		assertThat(decoder.canDecode(ResolvableType.forClass(String.class), null)).isFalse();
+		assertThat(decoder.canDecode(ResolvableType.forClass(String.class), null)).isTrue();
 		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo.class), APPLICATION_JSON)).isFalse();
 	}
 
diff --git a/spring-web/src/test/java/org/springframework/http/codec/cbor/JacksonCborEncoderTests.java b/spring-web/src/test/java/org/springframework/http/codec/cbor/JacksonCborEncoderTests.java
index 2e7b0bc3e1f..f9579457cbb 100644
--- a/spring-web/src/test/java/org/springframework/http/codec/cbor/JacksonCborEncoderTests.java
+++ b/spring-web/src/test/java/org/springframework/http/codec/cbor/JacksonCborEncoderTests.java
@@ -59,6 +59,7 @@ class JacksonCborEncoderTests extends AbstractLeakCheckingTests {
 		ResolvableType pojoType = ResolvableType.forClass(Pojo.class);
 		assertThat(this.encoder.canEncode(pojoType, MediaType.APPLICATION_CBOR)).isTrue();
 		assertThat(this.encoder.canEncode(pojoType, null)).isTrue();
+		assertThat(this.encoder.canEncode(ResolvableType.forClass(String.class), null)).isTrue();
 
 		// SPR-15464
 		assertThat(this.encoder.canEncode(ResolvableType.NONE, null)).isTrue();
@@ -66,7 +67,6 @@ class JacksonCborEncoderTests extends AbstractLeakCheckingTests {
 
 	@Test
 	void canNotEncode() {
-		assertThat(this.encoder.canEncode(ResolvableType.forClass(String.class), null)).isFalse();
 		assertThat(this.encoder.canEncode(ResolvableType.forClass(Pojo.class), APPLICATION_XML)).isFalse();
 	}
 
diff --git a/spring-web/src/test/java/org/springframework/http/codec/smile/JacksonSmileDecoderTests.java b/spring-web/src/test/java/org/springframework/http/codec/smile/JacksonSmileDecoderTests.java
index db4ce8d29d7..e0c7aa465a8 100644
--- a/spring-web/src/test/java/org/springframework/http/codec/smile/JacksonSmileDecoderTests.java
+++ b/spring-web/src/test/java/org/springframework/http/codec/smile/JacksonSmileDecoderTests.java
@@ -62,7 +62,7 @@ class JacksonSmileDecoderTests extends AbstractDecoderTests<JacksonSmileDecoder>
 		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo.class), STREAM_SMILE_MIME_TYPE)).isTrue();
 		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo.class), null)).isTrue();
 
-		assertThat(decoder.canDecode(ResolvableType.forClass(String.class), null)).isFalse();
+		assertThat(decoder.canDecode(ResolvableType.forClass(String.class), null)).isTrue();
 		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo.class), APPLICATION_JSON)).isFalse();
 	}
 
diff --git a/spring-web/src/test/java/org/springframework/http/codec/smile/JacksonSmileEncoderTests.java b/spring-web/src/test/java/org/springframework/http/codec/smile/JacksonSmileEncoderTests.java
index b4b97df6f74..c32559c5b8c 100644
--- a/spring-web/src/test/java/org/springframework/http/codec/smile/JacksonSmileEncoderTests.java
+++ b/spring-web/src/test/java/org/springframework/http/codec/smile/JacksonSmileEncoderTests.java
@@ -65,6 +65,7 @@ class JacksonSmileEncoderTests extends AbstractEncoderTests<JacksonSmileEncoder>
 		assertThat(this.encoder.canEncode(pojoType, SMILE_MIME_TYPE)).isTrue();
 		assertThat(this.encoder.canEncode(pojoType, STREAM_SMILE_MIME_TYPE)).isTrue();
 		assertThat(this.encoder.canEncode(pojoType, null)).isTrue();
+		assertThat(this.encoder.canEncode(ResolvableType.forClass(String.class), null)).isTrue();
 
 		// SPR-15464
 		assertThat(this.encoder.canEncode(ResolvableType.NONE, null)).isTrue();
@@ -72,7 +73,7 @@ class JacksonSmileEncoderTests extends AbstractEncoderTests<JacksonSmileEncoder>
 
 	@Test
 	void cannotEncode() {
-		assertThat(this.encoder.canEncode(ResolvableType.forClass(String.class), null)).isFalse();
+
 		assertThat(this.encoder.canEncode(ResolvableType.forClass(Pojo.class), APPLICATION_XML)).isFalse();
 	}
 
diff --git a/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/SseIntegrationTests.java b/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/SseIntegrationTests.java
index 7b4677bc1f8..4d4d6f8cebc 100644
--- a/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/SseIntegrationTests.java
+++ b/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/SseIntegrationTests.java
@@ -146,7 +146,6 @@ class SseIntegrationTests extends AbstractHttpHandlerIntegrationTests {
 
 		Flux<ServerSentEvent<Person>> result = this.webClient.get()
 				.uri("/event")
-				.accept(TEXT_EVENT_STREAM)
 				.retrieve()
 				.bodyToFlux(new ParameterizedTypeReference<>() {});