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
1条答案
按热度按时间z31licg01#
默认情况下，Jackson的数据绑定将尝试使用无参数构造函数构造对象，然后从JSON的相应位填充对象的属性。
字符串
JsonCreatorannotation告诉Jackson要调用哪个构造函数，它的参数用JsonProperty注解，以指示JSON中的哪些属性对应于构造函数中的哪些参数。JSON中与构造函数参数不对应的其他属性将通过setter或直接字段访问正常注入。