No converter found for return value of type: class java.util.HashMap

在使用spring boot 框架 部署到Tomcat中，访问controller 报

No converter found for return value of type: class java.util.HashMap错，原因是spring boot 使用的 spring相关的jar包与Jackson的jar包不匹配

spring mvc 部分 jar包 
Jackson 则需要引入较高版本的jar包maven pom.xml 配置如下<dependency>
   <groupId>org.codehaus.jackson</groupId>
   <artifactId>jackson-mapper-asl</artifactId>
   <version>1.9.13</version>
</dependency>
<dependency>
   <groupId>com.fasterxml.jackson.core</groupId>
   <artifactId>jackson-annotations</artifactId>
   <version>2.6.1</version>
</dependency>
<dependency>
   <groupId>com.fasterxml.jackson.core</groupId>
   <artifactId>jackson-core</artifactId>
   <version>2.6.1</version>
</dependency>
<dependency>
   <groupId>com.fasterxml.jackson.core</groupId>
   <artifactId>jackson-databind</artifactId>
   <version>2.6.1</version>
</dependency>
<dependency>
   <groupId>org.json</groupId>
   <artifactId>json</artifactId>
   <version>20140107</version>
</dependency>
重新部署项目并重启Tomcat就可以了。