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

不应该是转换成json输出嘛  这里说没有转化器？？？

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>2.11.0</version>
</dependency>

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-annotations</artifactId>
    <version>2.11.0</version>
</dependency>

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.11.0</version>
</dependency>

<mvc:annotation-driven>
    <mvc:message-converters>
        <bean class="org.springframework.http.converter.StringHttpMessageConverter">
            <property name="supportedMediaTypes">
                <list>
                    <value>text/html;charset=utf-8</value>
                    <!--6.JSON(Jackson)序列化输出配置 -->
                    <value>application/json;charset=utf-8</value>
                </list>
            </property>
        </bean>
    </mvc:message-converters>
</mvc:annotation-driven>


​@GetMapping("/test/t2")
@ResponseBody
public Map test2(){
    Map result = new HashMap();
    result.put("test", "测试文本");
    return result;
}