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copied!<p>You don't say how you're using Jackson in Spring, so I'll assume you're using it through <code><mvc:annotation-driven/></code> and the <code>@RequestBody</code> and/or <code>@ResponseBody</code> annotations.</p> <p>One of the things that <code><mvc:annotation-driven/></code> does is to register a <code>AnnotationMethodHandlerAdapter</code> bean which comes with a number of pre-configured <code>HttpMessageConverter</code> beans, including <code>MappingJacksonHttpMessageConverter</code>, which handles marshalling to and from Jackson-annotated model classes.</p> <p>Now <code>MappingJacksonHttpMessageConverter</code> has a <code>setObjectMapper()</code> method, which allows you to override the default <code>ObjectMapper</code>. But since <code>MappingJacksonHttpMessageConverter</code> is created behind the scenes by <code><mvc:annotation-driven/></code>, you can't get to it.</p> <p>However, <code><mvc:annotation-driven/></code> is just a convenient short-cut. It's just as a valid to declare your own <code>AnnotationMethodHandlerAdapter</code> bean, injecting into it your own <code>MappingJacksonHttpMessageConverter</code> bean (via the <code>messageConverters</code> property), and injecting your own customized <code>ObjectMapper</code> into that.</p> <p>You then have the problem of how to build a custom <code>ObjectMapper</code>, since it's not a very Spring-friendly class. I suggest writing your <a href="http://static.springsource.org/spring/docs/3.0.x/spring-framework-reference/html/beans.html#beans-factory-extension-factorybean" rel="noreferrer">own simple implementation of <code>FactoryBean</code></a>.</p> <p>So you'd end up with something like this:</p> <pre><code><bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"> <property name="messageConverters"> <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"> <property name="objectMapper"> <bean class="com.x.MyObjectMapperFactoryBean"/> </property> </bean> </property> </bean> </code></pre>

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