Spring3升级到Spring4时， 运行时出现找不到MappingJacksonHttpMessageConverter的情况
Spring3升级到Spring4时， 运行时出现找不到MappingJacksonHttpMessageConverter的情况
出错信息：
Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter#0'
... ...
Caused by: org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class for bean with name 'org.springframework.http.converter.json.MappingJacksonHttpMessageConverter#2aa148c0'
... ...
Caused by: java.lang.ClassNotFoundException: org.springframework.http.converter.json.MappingJacksonHttpMessageConverter
... ...原因是Spring 3.x 和4.X处理JSON的一个类不一样，而这个东西又配置在xml文件中，所以编译时又无法发现
spring3.x是org.springframework.http.converter.json.MappingJacksonHttpMessageConverter
spring4.x是org.springframework.http.converter.json.MappingJackson2HttpMessageConverter
1. 查找替换所有XML中名字
2. 同时加入最新的FastJackson依赖
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.8.5</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.8.5</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.8.5</version>
</dependency>原文：
https://www.cnblogs.com/shihaiming/p/6702572.html
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