我使用Jackson来示例化JSON字符串时遇到问题。我得到错误：com.fasterxml.jackson.databind.JsonMappingException：No suitable constructor found for type [simple type，class RatingDMO]：cannot instantiate from JSON object（need to add/enable type information？）
我有Map到JSON文件的字段和参数，它可以作为属性，并具有相同的类型。

注意：-如果我提供了no-arg构造函数（只是为了检查它是否工作），则Test工作。

我不能在我的代码中提供/保留默认构造函数，因为我在模型中只有很少的final字段。
mapper.readValue（new File（“ratingRequest.json”），RatingDMO.class）;

POJO Class：

public class RatingDMO implements Serializable {
    
    private static final long serialVersionUID = -433016040176969496L;
    private String company;
    private String state;
    private String lob;
    private String channel;
    private String username;
    private String password;
    private String policyNumber;
    private long policyKey;
    private String transactionType;
    private String evaluationType;
    private String clientID;
    private String policyTerm;
    private String effectiveDate;
    private String policyXML;
    private String webXML;
    private String firstName;
    private String lastName;
    private String businessName;
    private String city;
    private String zip;
    private String effectiveDtStart;
    private String effectiveDtEnd;
    private String searchType;
    private String uuid;
    private List<String> policyStatusCodes;
    private Map<String,String> eAdvisorCoverages;
    private Map<String,String> customCoverages;
    private Map<String,String> defaultCoverages;
    private String action;
    private String type;
    private String selectedCoverage;
    private boolean motorClubMember;
    private String selectedSubCoveres;
    private boolean customRated;
    private final PolicyDMO policyDMO;
    private final String allInsuredInd;
    private final String medicareMediaidInd;
    private final boolean driversGreaterthan65;
         
    public PolicyRatingRequestDMO(PolicyDMO policyDMO, String allInsuredInd, String medicareMediaidInd, boolean driversGreaterthan65){
        this.policyDMO = policyDMO;
        this.allInsuredInd = allInsuredInd;
        this.medicareMediaidInd = medicareMediaidInd;
        this.driversGreaterthan65 = driversGreaterthan65;
    }
... }

字符串