升级SpringMVC4.2.5 com/fasterxml/jackson/core/JsonProcessingException

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今天把 SpringMVC + Spring 升级到4.2.5 版本其他都很顺利，然后出现了一个包找不到，一看我的之前依赖 Jackjson 是存在的。但是还是有异常：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter#0' defined in class path resource [spring-mvc.xml]: Initialization of bean failed; nested exception is java.lang.NoClassDefFoundError: com/fasterxml/jackson/core/JsonProcessingException

来自：

<mvc:annotation-driven  />
<!-- 启动Spring MVC的注解功能，完成请求和注解POJO的映射 -->
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<!--json转换器-->
<ref bean="mappingJacksonHttpMessageConverter" />
</list>
</property>
</bean>
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">  
<property name="messageConverters">  
        <list>  
               <ref bean="mappingJacksonHttpMessageConverter" />  
        </list>  
    </property>  
</bean>  
        
<bean id="mappingJacksonHttpMessageConverter"  
    class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">  
     <property name = "supportedMediaTypes">  
  <list>  
    <bean class="org.springframework.http.MediaType">  
     <constructor-arg index="0" value="text"/>  
     <constructor-arg index="1" value="plain"/>  
     <constructor-arg index="2" value="UTF-8"/>  
    </bean>  
    <bean class="org.springframework.http.MediaType">  
     <constructor-arg index="0" value="*"/>  
     <constructor-arg index="1" value="*"/>  
     <constructor-arg index="2" value="UTF-8"/>  
    </bean>  
    <bean class="org.springframework.http.MediaType">  
     <constructor-arg index="0" value="text"/>  
     <constructor-arg index="1" value="*"/>  
     <constructor-arg index="2" value="UTF-8"/>  
    </bean>  
     <bean class="org.springframework.http.MediaType">  
     <constructor-arg index="0" value="application"/>  
     <constructor-arg index="1" value="json"/>  
     <constructor-arg index="2" value="UTF-8"/>  
    </bean>  
  </list>  
</property>  
</bean>

需要增加jar包（文章下方有下载链接）：

jackson-databind-2.7.4.jar
jackson-annotations-2.7.4.jar
jackson-core-2.7.4.jar

Maven 方式增加：

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.7.4</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>2.7.4</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-annotations</artifactId>
    <version>2.7.4</version>
</dependency>

增加后重新编译方可解决！

原文：http://www.sojson.com/blog/133.html

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