运行时：
Error creating bean with name 'org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter#0'
defined in ServletContext resource [/WEB-INF/spring-mvc.xml]:
Cannot create inner bean 'util:list#19a454b' of type [org.springframework.beans.factory.config.ListFactoryBean]
while setting bean property 'messageConverters';
nested exception is org.springframework.beans.factory.BeanCreationException:
Error creating bean with name 'util:list#19a454b':
Initialization of bean failed; nested exception is java.lang.NoClassDefFoundError: com/fasterxml/jackson/core/JsonProcessingException

原因：缺少夹包

解决：在 pom.xml 文件中添加如下：

		<!-- jackson start -->
 
		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-core</artifactId>
			<version>2.1.0</version>
		</dependency>
		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-databind</artifactId>
			<version>2.1.0</version>
		</dependency>
		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-annotations</artifactId>
			<version>2.1.0</version>
		</dependency>
		<!-- jackson end -->