JacksonUtil Jdk8Module added along with jackson-datatype-jdk8 dependency to address the Optional mapping

common/util/pom.xml

@@ -104,6 +104,10 @@
             <groupId>com.fasterxml.jackson.datatype</groupId>
             <artifactId>jackson-datatype-jsr310</artifactId>
         </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.datatype</groupId>
+            <artifactId>jackson-datatype-jdk8</artifactId>
+        </dependency>
     </dependencies>
 
     <build>

common/util/src/main/java/org/thingsboard/common/util/JacksonUtil.java

@@ -28,6 +28,7 @@ import com.fasterxml.jackson.databind.SerializationFeature;
 import com.fasterxml.jackson.databind.json.JsonMapper;
 import com.fasterxml.jackson.databind.node.ArrayNode;
 import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.fasterxml.jackson.datatype.jdk8.Jdk8Module;
 import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
 import com.google.common.collect.Lists;
 import lombok.extern.slf4j.Slf4j;
@@ -54,22 +55,30 @@ import java.util.regex.Pattern;
 @Slf4j
 public class JacksonUtil {
 
-    public static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
+    public static final ObjectMapper OBJECT_MAPPER = JsonMapper.builder()
+            .addModule(new Jdk8Module())
+            .build();
     public static final ObjectMapper PRETTY_SORTED_JSON_MAPPER = JsonMapper.builder()
+            .addModule(new Jdk8Module())
             .enable(SerializationFeature.INDENT_OUTPUT)
             .configure(SerializationFeature.ORDER_MAP_ENTRIES_BY_KEYS, true)
             .configure(MapperFeature.SORT_PROPERTIES_ALPHABETICALLY, true)
             .build();
     public static ObjectMapper ALLOW_UNQUOTED_FIELD_NAMES_MAPPER = JsonMapper.builder()
+            .addModule(new Jdk8Module())
             .configure(JsonWriteFeature.QUOTE_FIELD_NAMES.mappedFeature(), false)
             .configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true)
             .build();
     public static final ObjectMapper IGNORE_UNKNOWN_PROPERTIES_JSON_MAPPER = JsonMapper.builder()
+            .addModule(new Jdk8Module())
             .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
             .build();
 
     public static ObjectMapper getObjectMapperWithJavaTimeModule() {
-        return new ObjectMapper().registerModule(new JavaTimeModule());
+        return JsonMapper.builder()
+                .addModule(new Jdk8Module())
+                .addModule(new JavaTimeModule())
+                .build();
     }
 
     public static <T> T convertValue(Object fromValue, Class<T> toValueType) {