Java 用于搜索嵌套jsonb列对象的规范谓词

我已经将jsonb对象存储在postgresql中

{"sample": {"lastName": "Sahani", "firstName": "Sanjay"}, "address": "Address2", "bedrooms": 2, "postcode": "40 BS", "propertyType": "Type 2"}

我的表名是估价报告\u json 而jsonb列名称是params 我可以使用规范获取地址，但无法获取样本的名字 我的规格是

public class ValuationReportJSONSpecification implements Specification<ValuationReportJSON>{

    private String locale;
    private String fieldToSearch;
    private String localeParameter;
public ValuationReportJSONSpecification(String locale, String fieldToSearch,String localeParameter) {
        this.locale = locale;
        this.fieldToSearch = fieldToSearch;
        this.localeParameter=localeParameter;
    }
@Override
    public Predicate toPredicate(Root<ValuationReportJSON> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
        // TODO Auto-generated method stub
        System.err.println("INSIDE");
//      return cb.equal(cb.function("jsonb_extract_path_text", String.class, root.<String>get("params"), cb.literal(this.locale)), this.fieldToSearch);
        return cb.equal(cb.function("jsonb_extract_path_text", String.class,root.<String>get("params"), cb.literal(this.locale),cb.literal(this.localeParameter)),this.fieldToSearch);
    }
}

参数

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Params implements Serializable{

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    public String address;

    private String postcode;

    private SampleObj sample;

    private int bedrooms;
//getter setter
}

样本对象：

@Data
@NoArgsConstructor
@AllArgsConstructor
public class SampleObj implements Serializable{

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    private String firstName;

    private String lastName;
//getter setter
}

我不能使用连接谓词，因为我的对象没有映射或没有实体。 因为我见过同样的问题，但对象是实体：

@Data
@NoArgsConstructor
@AllArgsConstructor
public class SampleObj implements Serializable{

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    private String firstName;

    private String lastName;
//getter setter
}