Revert "Upgrade to Jackson 2.9.0.pr1"

This reverts commit 10ae5e8f3f. Health
serialization fails with Jackson 2.9.0 (gh-7695).

See gh-8537

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/ConfigurationPropertiesReportEndpoint.java

@@ -22,7 +22,6 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
-import com.fasterxml.jackson.annotation.JsonInclude.Include;
 import com.fasterxml.jackson.databind.BeanDescription;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.SerializationConfig;
@@ -172,7 +171,7 @@ public class ConfigurationPropertiesReportEndpoint
 	 */
 	protected void configureObjectMapper(ObjectMapper mapper) {
 		mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
-		mapper.setSerializationInclusion(Include.NON_NULL);
+		mapper.configure(SerializationFeature.WRITE_NULL_MAP_VALUES, false);
 		applyCglibFilters(mapper);
 		applySerializationModifier(mapper);
 	}

spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/ConfigurationPropertiesReportEndpointTests.java

@@ -61,18 +61,6 @@ public class ConfigurationPropertiesReportEndpointTests
 		assertThat(nestedProperties).isNotNull();
 		assertThat(nestedProperties.get("prefix")).isEqualTo("test");
 		assertThat(nestedProperties.get("properties")).isNotNull();
-
-	}
-
-	@Test
-	@SuppressWarnings("unchecked")
-	public void entriesWithNullValuesAreNotIncluded() {
-		ConfigurationPropertiesReportEndpoint report = getEndpointBean();
-		Map<String, Object> properties = report.invoke();
-		Map<String, Object> nestedProperties = (Map<String, Object>) properties
-				.get("testProperties");
-		assertThat((Map<String, Object>) nestedProperties.get("properties"))
-				.doesNotContainKey("nullValue");
 	}
 
 	@Test
@@ -286,8 +274,6 @@ public class ConfigurationPropertiesReportEndpointTests
 
 		private List<List<ListItem>> listOfListItems = new ArrayList<>();
 
-		private String nullValue = null;
-
 		public TestProperties() {
 			this.secrets.put("mine", "myPrivateThing");
 			this.secrets.put("yours", "yourPrivateThing");
@@ -351,14 +337,6 @@ public class ConfigurationPropertiesReportEndpointTests
 			this.listOfListItems = listOfListItems;
 		}
 
-		public String getNullValue() {
-			return this.nullValue;
-		}
-
-		public void setNullValue(String nullValue) {
-			this.nullValue = nullValue;
-		}
-
 		public static class Hidden {
 
 			private String mine = "mySecret";

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jackson/JacksonAutoConfigurationTests.java

@@ -30,8 +30,6 @@ import com.fasterxml.jackson.core.JsonGenerator;
 import com.fasterxml.jackson.core.JsonParser;
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.core.ObjectCodec;
-import com.fasterxml.jackson.databind.AnnotationIntrospector;
-import com.fasterxml.jackson.databind.DeserializationConfig;
 import com.fasterxml.jackson.databind.DeserializationFeature;
 import com.fasterxml.jackson.databind.JsonSerializer;
 import com.fasterxml.jackson.databind.MapperFeature;
@@ -40,6 +38,7 @@ import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.PropertyNamingStrategy.SnakeCaseStrategy;
 import com.fasterxml.jackson.databind.SerializationFeature;
 import com.fasterxml.jackson.databind.SerializerProvider;
+import com.fasterxml.jackson.databind.introspect.Annotated;
 import com.fasterxml.jackson.databind.module.SimpleModule;
 import com.fasterxml.jackson.databind.util.StdDateFormat;
 import com.fasterxml.jackson.module.paramnames.ParameterNamesModule;
@@ -60,7 +59,6 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Import;
 import org.springframework.context.annotation.Primary;
 import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
-import org.springframework.test.util.ReflectionTestUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.Mockito.mock;
@@ -447,12 +445,10 @@ public class JacksonAutoConfigurationTests {
 			Class<?>... configClasses) {
 		this.context.register(configClasses);
 		this.context.refresh();
-		DeserializationConfig deserializationConfig = this.context
+		Annotated annotated = mock(Annotated.class);
-				.getBean(ObjectMapper.class).getDeserializationConfig();
+		Mode mode = this.context.getBean(ObjectMapper.class).getDeserializationConfig()
-		AnnotationIntrospector annotationIntrospector = deserializationConfig
+				.getAnnotationIntrospector().findCreatorBinding(annotated);
-				.getAnnotationIntrospector().allIntrospectors().iterator().next();
+		assertThat(mode).isEqualTo(expectedMode);
-		assertThat(ReflectionTestUtils.getField(annotationIntrospector, "creatorBinding"))
-				.isEqualTo(expectedMode);
 	}
 
 	public static class MyDateFormat extends SimpleDateFormat {

spring-boot-dependencies/pom.xml

@@ -94,7 +94,7 @@
 		<httpclient.version>4.5.3</httpclient.version>
 		<httpcore.version>4.4.6</httpcore.version>
 		<infinispan.version>8.2.6.Final</infinispan.version>
-		<jackson.version>2.9.0.pr1</jackson.version>
+		<jackson.version>2.8.7</jackson.version>
 		<janino.version>2.7.8</janino.version>
 		<javassist.version>3.21.0-GA</javassist.version> <!-- Same as Hibernate -->
 		<javax-cache.version>1.0.0</javax-cache.version>