Upgrade to Jackson 3.0.0-rc8 and 2.20.0-rc1

Closes gh-35295

Author: sdeleuze

framework-platform/framework-platform.gradle

@@ -7,7 +7,7 @@ javaPlatform {
 }
 
 dependencies {
-	api(platform("com.fasterxml.jackson:jackson-bom:2.19.2"))
+	api(platform("com.fasterxml.jackson:jackson-bom:2.20.0-rc1"))
 	api(platform("io.micrometer:micrometer-bom:1.16.0-M2"))
 	api(platform("io.netty:netty-bom:4.2.3.Final"))
 	api(platform("io.projectreactor:reactor-bom:2025.0.0-M6"))
@@ -21,7 +21,7 @@ dependencies {
 	api(platform("org.jetbrains.kotlinx:kotlinx-serialization-bom:1.9.0"))
 	api(platform("org.junit:junit-bom:5.13.4"))
 	api(platform("org.mockito:mockito-bom:5.18.0"))
-	api(platform("tools.jackson:jackson-bom:3.0.0-rc6"))
+	api(platform("tools.jackson:jackson-bom:3.0.0-rc8"))
 
 	constraints {
 		api("com.fasterxml:aalto-xml:1.3.2")

spring-web/src/test/java/org/springframework/http/converter/json/Jackson2ObjectMapperBuilderTests.java

@@ -52,6 +52,7 @@
 import com.fasterxml.jackson.databind.MapperFeature;
 import com.fasterxml.jackson.databind.Module;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.PropertyNamingStrategies;
 import com.fasterxml.jackson.databind.PropertyNamingStrategy;
 import com.fasterxml.jackson.databind.SerializationFeature;
 import com.fasterxml.jackson.databind.SerializerProvider;
@@ -375,7 +376,7 @@ void modulesWithConsumerAfterModulesToInstall() {
 
 	@Test
 	void propertyNamingStrategy() {
-		PropertyNamingStrategy strategy = new PropertyNamingStrategy.SnakeCaseStrategy();
+		PropertyNamingStrategy strategy = new PropertyNamingStrategies.SnakeCaseStrategy();
 		ObjectMapper objectMapper = Jackson2ObjectMapperBuilder.json().propertyNamingStrategy(strategy).build();
 		assertThat(objectMapper.getSerializationConfig().getPropertyNamingStrategy()).isSameAs(strategy);
 		assertThat(objectMapper.getDeserializationConfig().getPropertyNamingStrategy()).isSameAs(strategy);

spring-web/src/test/java/org/springframework/http/converter/json/Jackson2ObjectMapperFactoryBeanTests.java

@@ -39,6 +39,7 @@
 import com.fasterxml.jackson.databind.MapperFeature;
 import com.fasterxml.jackson.databind.Module;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.PropertyNamingStrategies;
 import com.fasterxml.jackson.databind.PropertyNamingStrategy;
 import com.fasterxml.jackson.databind.SerializationFeature;
 import com.fasterxml.jackson.databind.SerializerProvider;
@@ -222,7 +223,7 @@ private static DeserializerFactoryConfig getDeserializerFactoryConfig(ObjectMapp
 
 	@Test
 	void propertyNamingStrategy() {
-		PropertyNamingStrategy strategy = new PropertyNamingStrategy.SnakeCaseStrategy();
+		PropertyNamingStrategy strategy = new PropertyNamingStrategies.SnakeCaseStrategy();
 		this.factory.setPropertyNamingStrategy(strategy);
 		this.factory.afterPropertiesSet();
 

spring-webflux/src/test/java/org/springframework/web/reactive/DispatcherHandlerErrorTests.java

@@ -123,7 +123,7 @@ void noStaticResource() {
 		assertThat(response.getBodyAsString().block()).isEqualTo("""
 				{\
 				"detail":"No static resource non-existing.",\
-				"instance":"\\/resources\\/non-existing",\
+				"instance":"/resources/non-existing",\
 				"status":404,\
 				"title":"Not Found"}\
 				""");

spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/RequestMappingExceptionHandlingIntegrationTests.java

@@ -123,7 +123,7 @@ void globalExceptionHandlerWithHandlerNotFound() throws Exception {
 				.satisfies(ex -> {
 					assertThat(ex.getStatusCode()).isEqualTo(HttpStatus.NOT_FOUND);
 					assertThat(ex.getResponseBodyAsString()).isEqualTo("{" +
-							"\"instance\":\"\\/no-such-handler\"," +
+							"\"instance\":\"/no-such-handler\"," +
 							"\"status\":404," +
 							"\"title\":\"Not Found\"}");
 				});
@@ -139,7 +139,7 @@ void globalExceptionHandlerWithMissingRequestParameter() throws Exception {
 					assertThat(ex.getStatusCode()).isEqualTo(HttpStatus.BAD_REQUEST);
 					assertThat(ex.getResponseBodyAsString()).isEqualTo("{" +
 							"\"detail\":\"Required query parameter 'q' is not present.\"," +
-							"\"instance\":\"\\/missing-request-parameter\"," +
+							"\"instance\":\"/missing-request-parameter\"," +
 							"\"status\":400," +
 							"\"title\":\"Bad Request\"}");
 				});

spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/ResponseBodyResultHandlerTests.java

@@ -151,7 +151,7 @@ private void testProblemDetailMediaType(MockServerWebExchange exchange, MediaTyp
 		assertResponseBody(exchange,"""
 				{\
 				"status":400,\
-				"instance":"\\/path",\
+				"instance":"/path",\
 				"title":"Bad Request"\
 				}""");
 	}

spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/ResponseEntityResultHandlerTests.java

@@ -242,7 +242,7 @@ void handleErrorResponse() {
 		assertThat(exchange.getResponse().getHeaders().getContentType()).isEqualTo(MediaType.APPLICATION_PROBLEM_JSON);
 		assertResponseBody(exchange,"""
 				{\
-				"instance":"\\/path",\
+				"instance":"/path",\
 				"status":400,\
 				"title":"Bad Request"\
 				}""");
@@ -262,7 +262,7 @@ void handleProblemDetail() {
 		assertThat(exchange.getResponse().getHeaders().getContentType()).isEqualTo(MediaType.APPLICATION_PROBLEM_JSON);
 		assertResponseBody(exchange,"""
 				{\
-				"instance":"\\/path",\
+				"instance":"/path",\
 				"status":400,\
 				"title":"Bad Request"\
 				}""");

spring-webmvc/src/test/java/org/springframework/web/servlet/resource/ResourceHttpRequestHandlerIntegrationTests.java

@@ -142,7 +142,7 @@ void testNoResourceFoundException() throws Exception {
 		assertThat(response.getContentAsString()).isEqualTo("""
 				{\
 				"detail":"No static resource non-existing.",\
-				"instance":"\\/cp\\/non-existing",\
+				"instance":"/cp/non-existing",\
 				"status":404,\
 				"title":"Not Found"\
 				}\