我有三门课：

@JsonIgnoreProperties(ignoreUnknown = true)
@JsonTypeInfo(
        use = JsonTypeInfo.Id.NAME,
        include = JsonTypeInfo.As.EXISTING_PROPERTY,
        property = "type"
)
@JsonSubTypes(value = {
        @JsonSubTypes.Type(value = CaseBO.class, name = "case"),
        @JsonSubTypes.Type(value = CallBO.class, name = "call"),
})
abstract class BusinessObject {
     private Map<String, Object> properties = new HashMap<>();
     private String type;
     public String getType() {
         return this.type;
     }
     public void setType(String type) {
         this.type = type;
     }
     public Map<String, Object> getProperties() {
        return properties;
    }
    public void setProperties(Map<String, Object> properties) {
        this.properties = properties;
    }
}
class CallBO extends BusinessObject {
   private String content;
   public String getContent() {
       return this.content;
   }
   public void setContent(String content) {
       this.content = content;
   }
}
class CaseBo extends BusinessObject {
    private String caseId;
    public String getCaseId() {
        return caseId;
    }
    public void setCaseId(String caseId) {
        this.caseId = caseId;
    }
}

我想要的是：
除了默认的继承反序列化（将json字段和它们的值放入POJO的bean属性中）之外，我还想将每个字段都放入属性Map中。那么我如何用最少的代码来完成这一点呢？