No converter found for return value of type: class java.util.ArrayList 之异常

 

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

 

造成这个异常的原因是，springMVC种没有转为Json的依赖：

 

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

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

导入这两个依赖之后就会解决问题