Custom ObjectMapper and NamingStrategy in Spring 3 MVC - json

Question

I'm using Spring MVC 3 and MappingJacksonHttpMessageConverter in order to get the json data with #ResponseBody. With the default config works ok but now i need to transform the camelCase fields to Pascal casing. For this purpose, i've developed a custom naming strategy:
UpperCaseNamingStrategy.java
public class UpperCaseNamingStrategy extends PropertyNamingStrategy {
#Override
public String nameForField(MapperConfig config, AnnotatedField field, String defaultName){
return convert(defaultName);
}
#Override
public String nameForGetterMethod(MapperConfig config, AnnotatedMethod method, String defaultName){
return convert(defaultName);
}
#Override
public String nameForSetterMethod(MapperConfig config, AnnotatedMethod method, String defaultName){
return convert(defaultName);
}
public String convert(String defaultName){
char[] arr= defaultName.toCharArray();
if(arr.length != 0){
if(Character.isLowerCase(arr[0])){
arr[0] = Character.toUpperCase(arr[0]);
}
}
return new StringBuilder().append(arr).toString();
}
}
I set my custom strategy to the objectMapper and i set the objectMapper in the converter. These are the beans:
<bean id="jacksonMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
<property name="objectMapper" ref="jacksonObjectMapper" />
</bean>
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<ref bean="jacksonMessageConverter"/>
</list>
</property>
</bean>
<bean id="jacksonObjectMapper" class="org.codehaus.jackson.map.ObjectMapper">
<property name="propertyNamingStrategy" ref="namingStrategy"/>
</bean>
<bean id="namingStrategy" class="es.unican.meteo.util.UpperCaseNamingStrategy"></bean>
The beans are registered properly because i can see it in the log but when i request the json data the behaviour is the same and the converter method is not called. Do I need more configs?

Answer 1

Following changes are suggested as compared to what I did in my project:
Change mapper bean class to "com.fasterxml.jackson.databind.ObjectMapper". I am using Spring 4.3
add #JsonProperty annotation to the property of class which is being serielized/deseralized
Create default constructors in class which is being serielized/deseralized
Best of Luck!