Adding LocalDate Mapper to message-converters in spring

Question

Can someone help me here please ?

I need to convert Java 8 LocalDate to JSON and vice versa in my REST application to MVC application where I am calling REST API's. SInce default JacksonJAXbJSONProvider does not parse LOcalDate, I wrote custom Mapper as below And dependency is added in pom.xml

public class LocalDateObjectMapperContextResolver implements ContextResolver<ObjectMapper>{
private final ObjectMapper MAPPER;

public LocalDateObjectMapperContextResolver() {
    MAPPER = new ObjectMapper();
    MAPPER.registerModule(new JavaTimeModule());
    //MAPPER.findAndRegisterModules();
    MAPPER.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
}

@Override
public ObjectMapper getContext(Class<?> type) {
    return MAPPER;
}

}

This was suggested in Java 8 LocalDate Jackson format

I need to pass it to message-converters in spring.xml.

<mvc:annotation-driven>
    <mvc:message-converters>
        <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"
              p:objectMapper-ref="objectMapper"/>
    </mvc:message-converters>
</mvc:annotation-driven>

Since one default mapper is already there, I cannot add my mapper to it. So I made below changes, but it still does not work

<mvc:annotation-driven >
    <mvc:message-converters register-defaults="false">
        <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" >
             <!--  p:objectMapper-ref="objectMapper"/> -->
             <property name="objectMapper" ref="localDateMapper" />
        </bean>
    </mvc:message-converters>
</mvc:annotation-driven>

This is obviously not correct since I am passing resolver where mapper is required. How do I call getContext() method of custom class and set that in Message Converter ? Now it started throwing exception whilel starting application Error creating bean with name 'org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter#0': Cannot create inner bean 'org.springframework.http.converter.json.MappingJacksonHttpMessageConverter#0' of type [org.springframework.http.converter.json.MappingJacksonHttpMessageConverter] while setting bean property 'messageConverters' with key [0]; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.http.converter.json.MappingJacksonHttpMessageConverter#0' defined in ServletContext resource [/WEB-INF/spring.xml]: Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type '****package***.LocalDateObjectMapperContextResolver' to required type 'org.codehaus.jackson.map.ObjectMapper' for property 'objectMapper'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [****package***.LocalDateObjectMapperContextResolver] to required type [org.codehaus.jackson.map.ObjectMapper] for property 'objectMapper': no matching editors or conversion strategy found

angcap angcap · Accepted Answer · 2016-06-28T10:44:11

You need only a custom module, not a mapper. Then configure spring accordingly:

<bean id="objectMapper" class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean"
      p:simpleDateFormat="yyyy-MM-dd"
      p:modulesToInstall="your.module.JavaTimeModule"/>

<bean id="xmlMapper" parent="objectMapper" p:createXmlMapper="true"/>

<mvc:annotation-driven>
    <mvc:message-converters>
        <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
            <property name="objectMapper" ref="objectMapper"/>
        </bean>
        <bean class="org.springframework.http.converter.xml.MappingJackson2XmlHttpMessageConverter">
            <property name="objectMapper" ref="xmlMapper"/>
        </bean>
    </mvc:message-converters>
</mvc:annotation-driven>

Adding LocalDate Mapper to message-converters in spring

1 Answers