无法将字符串转换为HashMap Spring Boot应用程序

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

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;

public class StringToHashMapConverter {
    public static void main(String[] args) {
        String jsonString = "{\"key1\":\"value1\",\"key2\":\"value2\"}";

        try {
            ObjectMapper objectMapper = new ObjectMapper();
            HashMap<String, String> hashMap = objectMapper.readValue(jsonString, new TypeReference<HashMap<String, String>>(){});

            System.out.println(hashMap);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}