关于问题The fully qualified name of the bean's class, except if it serves only as a parent definition fo

1.1、异常描述

Description Resource    Path    Location    Type
Class 'org.springframework.http.converter.json.MappingJacksonHttpMessageConverter' not found [config set: testweba/web-context] spring-mvc.xml
/testweba/src/main/resources    line 13 Spring Beans Problem

1.2、原因分析

Spring3升级到Spring4时， 运行时出现找不到MappingJacksonHttpMessageConverter的情况

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

1.3 解决办法

spring3.x是org.springframework.http.converter.json.MappingJacksonHttpMessageConverter

spring4.x是org.springframework.http.converter.json.MappingJackson2HttpMessageConverter
查找替换所有XML中名字
同时加入最新的FastJackson依赖

2.1 异常描述

Description Resource    Path    Location    Type
Build path is incomplete. Cannot find class file for com/fasterxml/jackson/core/JsonGenerator   spring-mvc.xml  /testweba/src/main/resources    line 13 Spring AOP Problem

2.2 原因分析

Spring 4.x 需要依赖的相关FastJackson jar

2.3 解决办法

<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>'''