org.springframework.http.converter.json.MappingJacksonHttpMessageConverter

使用Maven管理依赖，整合Spring与SpringMVC时一直报以下错误:

Caused by: java.lang.ClassNotFoundException: org.springframework.http.converter.json.MappingJacksonHttpMessageConverter

1.检查是否没有引入包的依赖：

pom.xml需要检查是否引入以下两个包:

		<!-- jackson -->
		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-core</artifactId>
			<version>2.4.4</version>
		</dependency>
		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-databind</artifactId>
			<version>2.4.4</version>
		</dependency>

2.检查spring-mvc中转化json的bean配置:

spring-mvc.xml文件中的配置中注入的一个org.springframework.http.converter.json.MappingJackson2HttpMessageConverter对象是否如下配置：

<bean id="mappingJackson2HttpMessageConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
	<property name="supportedMediaTypes">
		<list>
			<value>text/html;charset=UTF-8</value>
		</list>
	</property>
</bean>

如果配置的对象为

org.springframework.http.converter.json.MappingJacksonHttpMessageConverter

则替换为

org.springframework.http.converter.json.MappingJackson2HttpMessageConverter