Add property to customize Jackson's default leniency

See gh-27659

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jackson/JacksonAutoConfiguration.java

@@ -187,6 +187,7 @@ public class JacksonAutoConfiguration {
 				configurePropertyNamingStrategy(builder);
 				configureModules(builder);
 				configureLocale(builder);
+				configureLeniency(builder);
 			}
 
 			private void configureFeatures(Jackson2ObjectMapperBuilder builder, Map<?, Boolean> features) {
@@ -289,6 +290,11 @@ public class JacksonAutoConfiguration {
 				}
 			}
 
+			private void configureLeniency(Jackson2ObjectMapperBuilder builder) {
+				Boolean lenient = this.jacksonProperties.getLenient();
+				builder.postConfigurer(objectMapper -> objectMapper.setDefaultLeniency(lenient));
+			}
+
 			private static <T> Collection<T> getBeans(ListableBeanFactory beanFactory, Class<T> type) {
 				return BeanFactoryUtils.beansOfTypeIncludingAncestors(beanFactory, type).values();
 			}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jackson/JacksonProperties.java

@@ -103,6 +103,11 @@ public class JacksonProperties {
 	 */
 	private Locale locale;
 
+	/**
+	 * Setting for leniency, in case of absence it will be considered lenient = true;
+	 */
+	private Boolean lenient;
+
 	public String getDateFormat() {
 		return this.dateFormat;
 	}
@@ -167,4 +172,12 @@ public class JacksonProperties {
 		this.locale = locale;
 	}
 
+	public Boolean getLenient() {
+		return lenient;
+	}
+
+	public void setLenient(Boolean lenient) {
+		this.lenient = lenient;
+	}
+
 }

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

@@ -26,6 +26,7 @@ import java.util.Set;
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonCreator.Mode;
+import com.fasterxml.jackson.annotation.JsonFormat;
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.core.JsonGenerator;
 import com.fasterxml.jackson.core.JsonParser;
@@ -40,6 +41,7 @@ import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.PropertyNamingStrategies.SnakeCaseStrategy;
 import com.fasterxml.jackson.databind.SerializationFeature;
 import com.fasterxml.jackson.databind.SerializerProvider;
+import com.fasterxml.jackson.databind.exc.InvalidFormatException;
 import com.fasterxml.jackson.databind.module.SimpleModule;
 import com.fasterxml.jackson.databind.util.StdDateFormat;
 import com.fasterxml.jackson.module.paramnames.ParameterNamesModule;
@@ -301,6 +303,40 @@ class JacksonAutoConfigurationTests {
 				});
 	}
 
+	@Test
+	void disableLeniency() {
+		this.contextRunner.withPropertyValues("spring.jackson.lenient:false").run((context) -> {
+			boolean invalidFormat = false;
+			ObjectMapper mapper = context.getBean(ObjectMapper.class);
+			try {
+				mapper.readValue("{\"birthDate\": \"2010-12-30\"}", Person.class);
+			}
+			catch (InvalidFormatException e) {
+				assertThat(e).isNotNull();
+				invalidFormat = true;
+			}
+			assertThat(invalidFormat).isTrue();
+		});
+	}
+
+	@Test
+	void enableLeniency() {
+		this.contextRunner.withPropertyValues("spring.jackson.lenient:true").run((context) -> {
+			ObjectMapper mapper = context.getBean(ObjectMapper.class);
+			Person person = mapper.readValue("{\"birthDate\": \"2010-12-30\"}", Person.class);
+			assertThat(person.getBirthDate()).isNotNull();
+		});
+	}
+
+	@Test
+	void defaultLeniency() {
+		this.contextRunner.run((context) -> {
+			ObjectMapper mapper = context.getBean(ObjectMapper.class);
+			Person person = mapper.readValue("{\"birthDate\": \"2010-12-30\"}", Person.class);
+			assertThat(person.getBirthDate()).isNotNull();
+		});
+	}
+
 	@Test
 	void additionalJacksonBuilderCustomization() {
 		this.contextRunner.withUserConfiguration(ObjectMapperBuilderCustomConfig.class).run((context) -> {
@@ -537,4 +573,19 @@ class JacksonAutoConfigurationTests {
 
 	}
 
+	static class Person {
+
+		@JsonFormat(pattern = "yyyyMMdd")
+		private Date birthDate;
+
+		public Date getBirthDate() {
+			return birthDate;
+		}
+
+		public void setBirthDate(Date birthDate) {
+			this.birthDate = birthDate;
+		}
+
+	}
+
 }