使用同一个表中的两个外键时抛出 bean 创建异常答案

【问题标题】：beancreation exception throws when use two foreign keys from the same table使用同一个表中的两个外键时抛出 bean 创建异常
【发布时间】：2014-10-20 11:52:05
【问题描述】：

我在我的项目中使用 mssql 服务器和 hibernate3。我得到以下异常

org.springframework.beans.factory.BeanCreationException:
Error creating bean with name 'sessionFactory' defined in ServletContext resource [/WEB-INF/dispatcher-servlet.xml]: Invocation of init method failed; 
nested exception is org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: com.uniphore.timesheet.domain.TblBaseLine.tblUserDetails in com.uniphore.timesheet.domain.TblUserDetails.tblBaseLinesForApproverId

我使用同一张表中的两个外键。但我不知道如何为此编写注释。

例如考虑下面的模型

User    
userid(PK)
role 
name

Assignment
AssignmentID(pk)
studentID(Fk_User)
professiorID(Fk_user)

以下是我的课程： Tbl基线

package com.uniphore.timesheet.domain;



import java.math.BigDecimal;
import java.util.Date;
import java.util.HashSet;
import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;

@Entity
@Table(name="tblBaseLine")
public class TblBaseLine  implements java.io.Serializable {


    private static final long serialVersionUID = -1798070786993154671L;
     @Id
     @GeneratedValue
     @Column(name ="ID")
     private int id;
     @ManyToOne
     @JoinColumn(name="ModifierID")
     private TblUserDetails tblUserDetailsByModifierId;
     @ManyToOne
     @JoinColumn(name="ApproverID")
     private TblUserDetails tblUserDetailsByApproverId;

     @OneToMany(fetch = FetchType.LAZY, mappedBy = "tblBaseLine", cascade = CascadeType.ALL)
     private Set<TblPhaseBaseLine> tblPhaseBaseLines = new HashSet<TblPhaseBaseLine>(0);

    public TblBaseLine() {
    }


    public TblBaseLine(int id) {
        this.id = id;
    }


}

TblPhaseBaseLine

package com.uniphore.timesheet.domain;



import java.util.Date;
import java.util.HashSet;
import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;

@Entity
@Table(name="tblPhaseBaseLine")
public class TblPhaseBaseLine  implements java.io.Serializable {

    private static final long serialVersionUID = -1798070786993154674L;
     @Id
     @GeneratedValue
     @Column(name ="ID")
     private int id;
     @ManyToOne
     @JoinColumn(name ="PhaseID")
     private TblProjectPhase tblProjectPhase;
     @ManyToOne
     @JoinColumn(name ="BaseLineID")
     private TblBaseLine tblBaseLine;

     @OneToMany(fetch = FetchType.LAZY, mappedBy = "tblPhaseBaseLine", cascade = CascadeType.ALL)
     private Set<TblProjectPhase> tblProjectPhases = new HashSet<TblProjectPhase>(0);

    public TblPhaseBaseLine() {
    }


    public TblPhaseBaseLine(int id) {
        this.id = id;
    }




}

TblUserDetails:

package com.uniphore.timesheet.domain;



import java.util.Date;
import java.util.HashSet;
import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;

@Entity
@Table(name="tblUserDetails")
public class TblUserDetails  implements java.io.Serializable {
    private static final long serialVersionUID = -1798070786993154686L;
     @Id
     @GeneratedValue
     @Column(name ="ID")
     private int id;
     @ManyToOne
     @JoinColumn(name ="RoleID")
     private TblRoles tblRoles;


     @OneToMany(fetch = FetchType.LAZY, mappedBy = "tblUserDetails", cascade = CascadeType.ALL)
     private Set<TblUserPrevilege> tblUserPrevileges = new HashSet<TblUserPrevilege>(0);
     @OneToMany(fetch = FetchType.LAZY, mappedBy = "tblUserDetails", cascade = CascadeType.ALL)
     private Set<TblProjectApprover> tblProjectApprovers = new HashSet<TblProjectApprover>(0);
     @OneToMany(fetch = FetchType.LAZY, mappedBy = "tblUserDetails", cascade = CascadeType.ALL)
     private Set<TblProjectResource> tblProjectResources = new HashSet<TblProjectResource>(0);
     @OneToMany(fetch = FetchType.LAZY, mappedBy = "tblUserDetails", cascade = CascadeType.ALL)
     private Set<TblTimesheet> tblTimesheetsForApprover = new HashSet<TblTimesheet>(0);
     @OneToMany(fetch = FetchType.LAZY, mappedBy = "tblUserDetails", cascade = CascadeType.ALL)
     private Set<TblBaseLine> tblBaseLinesForModifierId = new HashSet<TblBaseLine>(0);
     @OneToMany(fetch = FetchType.LAZY, mappedBy = "tblUserDetails", cascade = CascadeType.ALL)
     private Set<TblTimesheet> tblTimesheetsForUserId = new HashSet<TblTimesheet>(0);
     @OneToMany(fetch = FetchType.LAZY, mappedBy = "tblUserDetails", cascade = CascadeType.ALL)
     private Set<TblBaseLine> tblBaseLinesForApproverId = new HashSet<TblBaseLine>(0);

    public TblUserDetails() {
    }




}

如何避免这个异常？任何帮助将不胜感激！！！

【问题讨论】：

代码过多！！！
@Rahul，好的，我会减少不必要的代码

标签： java sql-server spring foreign-key-relationship

【解决方案1】：

你没有避免异常——你解决了问题。该错误清楚地告诉您 com.uniphore.timesheet.domain.TblBaseLine 没有实体属性“tblUserDetails”。事实上，它没有。

因此，您在 TblUserDetails 上的“mappedBy”是完全错误的，请使用正确匹配的类属性名称。 tblUserDetailsByModifierId 或 tblUserDetailsByApproverId 是您可以在“mappedBy”中使用的可能的属性名称。

【讨论】：