JPA使用外鍵命名查詢不工作

Question

我的實體類

@Entity 
@Table(catalog = "", schema = "MYIS") 
@XmlRootElement 
@NamedQueries({ 
    @NamedQuery(name = "Answers.findAll", query = "SELECT a FROM Answers a"), 
    @NamedQuery(name = "Answers.findByAid", query = "SELECT a FROM Answers a WHERE a.aid = :aid"), 
    @NamedQuery(name ="Anaswers.findByqid", query ="SELECT a FROM Answers a WHERE a.answerQid.qid = :x"), 
    @NamedQuery(name = "Answers.findByAnsValue", query = "SELECT a FROM Answers a WHERE a.ansValue = :ansValue"), 
    @NamedQuery(name = "Answers.findByAnsDate", query = "SELECT a FROM Answers a WHERE a.ansDate = :ansDate")}) 
public class Answers implements Serializable { 
    private static final long serialVersionUID = 1L; 
    @Id 
    @Basic(optional = false) 
    @NotNull 
    @Column(nullable = false) 
    private Integer aid; 
    @Basic(optional = false) 
    @NotNull 
    @Size(min = 1, max = 4000) 
    @Column(name = "ANS_VALUE", nullable = false, length = 4000) 
    private String ansValue; 
    @Basic(optional = false) 
    @NotNull 
    @Column(name = "ANS_DATE", nullable = false) 
    @Temporal(TemporalType.TIMESTAMP) 
    private Date ansDate; 
    @JoinColumn(name = "A_USERID", referencedColumnName = "USERID", nullable = false) 
    @ManyToOne(optional = false) 
    private Users aUserid; 
    @JoinColumn(name = "ANSWER_QID", referencedColumnName = "QID", nullable = false) 
    @ManyToOne(optional = false) 
    private Questions answerQid; 
    @JoinColumn(name = "A_GROUPID", referencedColumnName = "GID", nullable = false) 
    @ManyToOne(optional = false) 
    private Groups aGroupid; 

    public Answers() { 
    } 

    public Answers(Integer aid) { 
     this.aid = aid; 
    } 

    public Answers(Integer aid, String ansValue, Date ansDate) { 
     this.aid = aid; 
     this.ansValue = ansValue; 
     this.ansDate = ansDate; 
    } 

    public Integer getAid() { 
     return aid; 
    } 

    public void setAid(Integer aid) { 
     this.aid = aid; 
    } 

    public String getAnsValue() { 
     return ansValue; 
    } 

    public void setAnsValue(String ansValue) { 
     this.ansValue = ansValue; 
    } 

    public Date getAnsDate() { 
     return ansDate; 
    } 

    public void setAnsDate(Date ansDate) { 
     this.ansDate = ansDate; 
    } 

    public Users getAUserid() { 
     return aUserid; 
    } 

    public void setAUserid(Users aUserid) { 
     this.aUserid = aUserid; 
    } 

    public Questions getAnswerQid() { 
     return answerQid; 
    } 

    public void setAnswerQid(Questions answerQid) { 
     this.answerQid = answerQid; 
    } 

    public Groups getAGroupid() { 
     return aGroupid; 
    } 

    public void setAGroupid(Groups aGroupid) { 
     this.aGroupid = aGroupid; 
    } 

    @Override 
    public int hashCode() { 
     int hash = 0; 
     hash += (aid != null ? aid.hashCode() : 0); 
     return hash; 
    } 

    @Override 
    public boolean equals(Object object) { 
     // TODO: Warning - this method won't work in the case the id fields are not set 
     if (!(object instanceof Answers)) { 
      return false; 
     } 
     Answers other = (Answers) object; 
     if ((this.aid == null && other.aid != null) || (this.aid != null && !this.aid.equals(other.aid))) { 
      return false; 
     } 
     return true; 
    } 

    @Override 
    public String toString() { 
     return "com.entity.Answers[ aid=" + aid + " ]"; 
    } 

} 

MY會話外觀

import com.entity.Answers; 
import com.entity.Groups; 
import java.util.List; 
import javax.ejb.Stateless; 
import javax.persistence.EntityManager; 
import javax.persistence.PersistenceContext; 
import javax.persistence.Query; 

/** 
* 
* @author krishna teja 
*/ 
@Stateless 
public class AnswersFacade extends AbstractFacade<Answers> implements AnswersFacadeLocal { 
    @PersistenceContext(unitName = "My_communityPU") 
    private EntityManager em; 

    @Override 
    protected EntityManager getEntityManager() { 
     return em; 
    } 

    public AnswersFacade() { 
     super(Answers.class); 
    } 

public List<Answers> getdataByQid(Long qid){ 


    Query query=em.createNamedQuery("Answers.findByqid"); 
    query.setParameter(1, qid); 
    List<Answers> a =query.getResultList(); 
     return a; 

} 


} 

我的託管bean

 @PostConstruct 
     public void init(){ 

      questions = questionsFacade.findAll(); 
      ansList = answersFacade.getdataByQid(g); 

      } 

我得到以下異常

at com.ejb.AnswersFacade.getdataByQid(AnswersFacade.java:36) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:601) 

我已經創建了一個名爲查詢外鍵的屬性answerQid和並在sessionfacade創建方法，並試圖訪問它的託管bean的默認方法完美地工作，但我的查詢方法不能正常工作，請幫我

Answer 1

看起來像一個簡單的錯字。命名查詢定義爲Anaswers.findByqid，但用作Answers.findByqid。