当classpath上的Jackson 1 JAR时，强制Spring 3.1使用Jackson 2 [英] Force Spring 3.1 to use Jackson 2 when Jackson 1 JARs on the classpath

问题描述

我有一个使用Maven构建的Spring MVC 3.1应用程序，我想使用Jackson 2进行JSON序列化/反序列化.我的pom.xml文件中明确包含Jackson 2.x依赖关系，尽管我的应用程序具有内部使用Jackson 1.9.9的不同依赖关系，而且我无法轻易删除该依赖关系.

I have a Spring MVC 3.1 app built with Maven and I want to use Jackson 2 for JSON serialization/deserialization. I am including Jackson 2.x dependencies explicitly in my pom.xml file, although my app has a different dependency that uses Jackson 1.9.9 internally, and I can't easily remove that dependency.

由于在类路径中同时存在两个Jackson库，因此Spring似乎默认使用1.9.9版的Jackson.

Because of both Jackson libs being present on the classpath, it seems like Spring is defaulting to using Jackson version 1.9.9.

如何强制Spring MVC使用Jackson 2?

How do I force Spring MVC to use Jackson 2?

推荐答案

要实现此目的，我必须调整mvc:annotation驱动的xml配置元素，使其工作如下:

To make this work, I had to adjust my mvc:annotation-driven xml configuration element to work as follows:

<mvc:annotation-driven>
  <mvc:message-converters register-defaults="false">
    <bean id="jacksonMessageConverter" 
      class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/>
  </mvc:message-converters>
</mvc:annotation-driven>

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