java.lang.ClassCastException: org.hibernate.hql.internal.ast.tree.SqlNode 无法转换为 org.hibernate.hql.internal.ast.tree.FromReferenceNode

Question

我正在尝试在 JPA 中执行一个 select 语句，它抛出了上述错误。代码是：

TypedQuery<ListPersonsObj> typedQuery = null;
String query = "";
List<ListPersonsObj> list = null;
if (some condition) {
   query = "SELECT NEW in.healthelife.DGS.dao.ListPersonsObj"
                    + "(c.personId, c.givenName, c.middleName, c.address1, "
                    + "c.address2, c.dateOfBirth, "
                    + "c.phoneNumber, c.email) FROM Patients c";
   typedQuery = EntityManagerUtil.getEntityManager()
                   .createQuery(query, ListPersonsObj.class);
   list = typedQuery.getResultList();
}

ListPersonsObj 类：

public class ListPersonsObj {

   private Long personId;
   private String givenName;
   private String middleName;
   private String address1;
   private String address2;
   private String dateOfBirth;
   private String phoneNumber;
   private String email;

   public ListPersonsObj() {
   }

   public ListPersonsObj(Long personId, String givenName, String middleName,
         String address1, String address2,
         String dateOfBirth, String phoneNumber, String email) {
      this.personId = personId;
      this.givenName = givenName;
      this.middleName = middleName;
      this.address1 = address1;
      this.address2 = address2;
      this.dateOfBirth = dateOfBirth;
      this.phoneNumber = phoneNumber;
      this.email = email;
   }

   public ListPersonsObj(ListPersonsObj list) {
      try {
         BeanUtils.copyProperties(this, list);
      } catch (IllegalAccessException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
      } catch (InvocationTargetException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
      }
   }
   // .. getters & setters 
}

捕获异常

java.lang.ClassCastException: org.hibernate.hql.internal.ast.tree.SqlNode 无法转换为 org.hibernate.hql.internal.ast.tree.FromReferenceNode

任何人都可以对此有所了解。

Answer 1

发生这种情况的一个原因是 Hibernate 在 JPQL 中的错误位置找到了一个保留字。

对于这种情况

问题在于包名

...

前缀是“in”而不是“com”。在解析查询时，“in”被视为保留世界

作为参考，请参阅此

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