nrknithin commented on code in PR #6686:
URL: 
https://github.com/apache/incubator-kie-drools/pull/6686#discussion_r3233606006


##########
drools-model/drools-model-codegen/src/main/resources/class-templates/ruleunits/RestObjectMapperSpringTemplate.java:
##########
@@ -18,43 +18,56 @@
  */
 package $Package$;
 
-import java.util.List;
-
 import java.io.IOException;
 import java.util.List;
 
-import com.fasterxml.jackson.databind.JavaType;
 import com.fasterxml.jackson.core.JsonParser;
-import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.BeanProperty;
 import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.JavaType;
 import com.fasterxml.jackson.databind.JsonDeserializer;
 import com.fasterxml.jackson.databind.JsonMappingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.deser.ContextualDeserializer;
+import com.fasterxml.jackson.databind.module.SimpleModule;
 import com.fasterxml.jackson.databind.type.CollectionType;
 
 import org.drools.ruleunits.api.DataSource;
 import org.drools.ruleunits.api.DataStore;
 import org.drools.ruleunits.api.DataStream;
 import org.drools.ruleunits.api.SingletonStore;
 
-import 
org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
 import org.springframework.boot.SpringBootConfiguration;
+import 
org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.context.annotation.Bean;
-import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
+import org.springframework.http.MediaType;
+import 
org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
 
+// TODO Jackson 3 migration: drop this shim when the Spring add-ons move to 
tools.jackson.databind.*.
 @SpringBootConfiguration
 public class RestObjectMapper {
 
+    public RestObjectMapper(ObjectMapper objectMapper) {
+        SimpleModule module = new SimpleModule();
+        module.addDeserializer(DataStream.class, new DataStreamDeserializer());
+        module.addDeserializer(DataStore.class, new DataStoreDeserializer());
+        module.addDeserializer(SingletonStore.class, new 
SingletonStoreDeserializer());
+        objectMapper.registerModule(module);
+    }
+
+    // TODO Jackson 3 migration: SB 4 no longer auto-registers a Jackson 2 
HTTP converter; register one

Review Comment:
   @yesamer Done — opened 
https://github.com/apache/incubator-kie-drools/issues/6702 with the migration 
context and the list of affected sites. Each Jackson 2 helper now links the 
issue directly. Same update is applied in kogito-runtimes 
[#4270](https://github.com/apache/incubator-kie-kogito-runtimes/pull/4270), 
kogito-apps 
[#2331](https://github.com/apache/incubator-kie-kogito-apps/pull/2331), and 
kogito-examples 
[#2210](https://github.com/apache/incubator-kie-kogito-examples/pull/2210) so 
every helper across the stack points at the same tracker.



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