Tomcat启动后，进行路由访问，报错如上
网上查了解决方案，说是maven配置中JSON版本问题
于是乎。。。。
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter]: Constructor threw exception; nested exception is java.lang.NoClassDefFoundError:

com/fasterxml/jackson/databind/exc/InvalidDefinitionException

at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:175)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:88)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1223)
… 37 common frames omitted

我的Spring版本

<properties>
	<spring.groupId>org.springframework</spring.groupId>
	***<spring.version>5.0.1.RELEASE</spring.version>***
	<mybatis.version>3.4.2</mybatis.version>
	<mybatis.spring.version>1.3.2</mybatis.spring.version>
	<!-- log4j日志文件管理包版本 -->
	<slf4j.version>1.7.7</slf4j.version>
	<log4j.version>1.2.17</log4j.version>
</properties>

JSON依赖

      <dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-databind</artifactId>
			<version>2.8.5</version>
		<!-- Map工具类 对标准java Collection的扩展Spring-core.jar需要Commons-collecion.jar 
			提供类的支持 -->
	   </dependency>
		<dependency>
			<groupId>commons-collections</groupId>
			<artifactId>commons-collections</artifactId>
			<version>3.2</version>
		</dependency>

我就将JSON的版本改为更高的版本，

   <dependency>
		<groupId>com.fasterxml.jackson.core</groupId>
		<artifactId>jackson-databind</artifactId>
		<version>2.9.5</version>

   </dependency>

然后可以访问了，版本的问题有点坑啊，顺便附上maven依赖下载地址
maven依赖下载地址