我使用 Hibernate 逆向工程来创建我的模型及其映射和关系。但是，当我尝试进行简单的选择时，会显示错误。我不知道我的映射出了什么问题。这是两个模型的代码。学生模型是父模型，评估模型是子模型。
评估模型:
import java.util.Date;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.AttributeOverride;
import javax.persistence.AttributeOverrides;
import javax.persistence.Column;
import javax.persistence.EmbeddedId;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
/**
* Assessment generated by hbm2java
*/
@Entity
@Table(name = "Assessment", catalog = "mydb")
public class AssessmentModel implements java.io.Serializable {
private AssessmentIdModel id;
private SpEdTeacherModel spedteacher;
private StudentModel Student;
private Date assessmentDate;
private Set<IepModel> ieps = new HashSet<IepModel>(0);
private Set<SkillassessmentModel> skillassessments = new HashSet<SkillassessmentModel>(0);
public AssessmentModel() {
}
public AssessmentModel(AssessmentIdModel id, SpEdTeacherModel spedteacher, StudentModel Student, Date assessmentDate) {
this.id = id;
this.spedteacher = spedteacher;
this.Student = Student;
this.assessmentDate = assessmentDate;
}
public AssessmentModel(AssessmentIdModel id, SpEdTeacherModel spedteacher, StudentModel Student, Date assessmentDate, Set<IepModel> ieps,
Set<SkillassessmentModel> skillassessments) {
this.id = id;
this.spedteacher = spedteacher;
this.Student = Student;
this.assessmentDate = assessmentDate;
this.ieps = ieps;
this.skillassessments = skillassessments;
}
@EmbeddedId
@AttributeOverrides({
@AttributeOverride(name = "assessmentId", column = @Column(name = "assessment_id", nullable = false) ),
@AttributeOverride(name = "spedId", column = @Column(name = "sped_id", nullable = false) ),
@AttributeOverride(name = "studentId", column = @Column(name = "student_id", nullable = false) ) })
public AssessmentIdModel getId() {
return this.id;
}
public void setId(AssessmentIdModel id) {
this.id = id;
}
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "sped_id", nullable = false, insertable = false, updatable = false)
public SpEdTeacherModel getSpedteacher() {
return this.spedteacher;
}
public void setSpedteacher(SpEdTeacherModel spedteacher) {
this.spedteacher = spedteacher;
}
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "student_id", nullable = false, insertable = false, updatable = false)
public StudentModel getStudent() {
return this.Student;
}
public void setStudent(StudentModel Student) {
this.Student = Student;
}
@Temporal(TemporalType.DATE)
@Column(name = "assessment_date", nullable = false, length = 10)
public Date getAssessmentDate() {
return this.assessmentDate;
}
public void setAssessmentDate(Date assessmentDate) {
this.assessmentDate = assessmentDate;
}
@OneToMany(fetch = FetchType.LAZY, mappedBy = "Assessment")
public Set<IepModel> getIeps() {
return this.ieps;
}
public void setIeps(Set<IepModel> ieps) {
this.ieps = ieps;
}
@OneToMany(fetch = FetchType.LAZY, mappedBy = "Assessment")
public Set<SkillassessmentModel> getSkillassessments() {
return this.skillassessments;
}
public void setSkillassessments(Set<SkillassessmentModel> skillassessments) {
this.skillassessments = skillassessments;
}
}
学生模型:
import java.util.Date;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import static javax.persistence.GenerationType.IDENTITY;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
/**
* Student generated by hbm2java
*/
@Entity
@Table(name = "Student", catalog = "mydb")
public class StudentModel implements java.io.Serializable {
private Integer studentId;
private GuardianModel guardian;
private String studentFname;
private String studentMname;
private String studentLname;
private Date studentBirthdate;
private int studentAge;
private String studentGender;
private String studentNationality;
private String studentProgram;
private Set<AssessmentModel> assessments = new HashSet<AssessmentModel>(0);
private Set<StudenthastherapistModel> studenthastherapists = new HashSet<StudenthastherapistModel>(0);
public StudentModel() {
}
public StudentModel(GuardianModel guardian, String studentFname, String studentMname, String studentLname,
Date studentBirthdate, int studentAge, String studentGender, String studentNationality, String studentProgram) {
this.guardian = guardian;
this.studentFname = studentFname;
this.studentMname = studentMname;
this.studentLname = studentLname;
this.studentBirthdate = studentBirthdate;
this.studentAge = studentAge;
this.studentGender = studentGender;
this.studentNationality = studentNationality;
this.studentProgram = studentProgram;
}
public StudentModel(GuardianModel guardian, String studentFname, String studentMname, String studentLname,
Date studentBirthdate, int studentAge, String studentGender,
String studentNationality, String studentProgram, Set<AssessmentModel> assessments,
Set<StudenthastherapistModel> studenthastherapists) {
this.guardian = guardian;
this.studentFname = studentFname;
this.studentMname = studentMname;
this.studentLname = studentLname;
this.studentBirthdate = studentBirthdate;
this.studentAge = studentAge;
this.studentGender = studentGender;
this.studentNationality = studentNationality;
this.studentProgram = studentProgram;
this.assessments = assessments;
this.studenthastherapists = studenthastherapists;
}
@Id
@GeneratedValue(strategy = IDENTITY)
@Column(name = "student_id", unique = true, nullable = false)
public Integer getStudentId() {
return this.studentId;
}
public void setStudentId(Integer studentId) {
this.studentId = studentId;
}
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "guardian_id", nullable = false)
public GuardianModel getGuardian() {
return this.guardian;
}
public void setGuardian(GuardianModel guardian) {
this.guardian = guardian;
}
@Column(name = "student_fname", nullable = false, length = 45)
public String getStudentFname() {
return this.studentFname;
}
public void setStudentFname(String studentFname) {
this.studentFname = studentFname;
}
@Column(name = "student_mname", nullable = false, length = 45)
public String getStudentMname() {
return this.studentMname;
}
public void setStudentMname(String studentMname) {
this.studentMname = studentMname;
}
@Column(name = "student_lname", nullable = false, length = 45)
public String getStudentLname() {
return this.studentLname;
}
public void setStudentLname(String studentLname) {
this.studentLname = studentLname;
}
@Temporal(TemporalType.DATE)
@Column(name = "student_birthdate", nullable = false, length = 10)
public Date getStudentBirthdate() {
return this.studentBirthdate;
}
public void setStudentBirthdate(Date studentBirthdate) {
this.studentBirthdate = studentBirthdate;
}
@Column(name = "student_age", nullable = false)
public int getStudentAge() {
return this.studentAge;
}
public void setStudentAge(int studentAge) {
this.studentAge = studentAge;
}
@Column(name = "student_gender", nullable = false, length = 6)
public String getStudentGender() {
return this.studentGender;
}
public void setStudentGender(String studentGender) {
this.studentGender = studentGender;
}
@Column(name = "student_nationality", nullable = false, length = 15)
public String getStudentNationality() {
return this.studentNationality;
}
public void setStudentNationality(String studentNationality) {
this.studentNationality = studentNationality;
}
@Column(name = "student_program", nullable = false, length = 45)
public String getStudentProgram() {
return this.studentProgram;
}
public void setStudentProgram(String studentProgram) {
this.studentProgram = studentProgram;
}
@OneToMany(fetch = FetchType.LAZY, mappedBy = "Student")
public Set<AssessmentModel> getAssessments() {
return this.assessments;
}
public void setAssessments(Set<AssessmentModel> assessments) {
this.assessments = assessments;
}
@OneToMany(fetch = FetchType.LAZY, mappedBy = "Student")
public Set<StudenthastherapistModel> getStudenthastherapists() {
return this.studenthastherapists;
}
public void setStudenthastherapists(Set<StudenthastherapistModel> studenthastherapists) {
this.studenthastherapists = studenthastherapists;
}
}
这是错误:
HTTP Status 500 - javax.servlet.ServletException: java.lang.ExceptionInInitializerError
type Exception report
message javax.servlet.ServletException: java.lang.ExceptionInInitializerError
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: javax.servlet.ServletException: java.lang.ExceptionInInitializerError
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:556)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:462)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
javax.servlet.ServletException: java.lang.ExceptionInInitializerError
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:916)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:845)
org.apache.jsp.index_jsp._jspService(index_jsp.java:138)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
java.lang.ExceptionInInitializerError
softdev.asese.utils.HibernateUtil.<clinit>(HibernateUtil.java:17)
softdev.asese.dao.GuardianDao.getGuardian(GuardianDao.java:16)
org.apache.jsp.index_jsp._jspService(index_jsp.java:93)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: softdev.asese.models.AssessmentModel.Student in softdev.asese.models.StudentModel.assessments
org.hibernate.cfg.annotations.CollectionBinder.bindStarToManySecondPass(CollectionBinder.java:769)
org.hibernate.cfg.annotations.CollectionBinder$1.secondPass(CollectionBinder.java:729)
org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:70)
org.hibernate.cfg.Configuration.originalSecondPassCompile(Configuration.java:1697)
org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1426)
org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1846)
org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1930)
softdev.asese.utils.HibernateUtil.<clinit>(HibernateUtil.java:14)
softdev.asese.dao.GuardianDao.getGuardian(GuardianDao.java:16)
org.apache.jsp.index_jsp._jspService(index_jsp.java:93)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
最佳答案
您的类(class)似乎没问题，除了您在AssessmentModel中的属性Student的大写字母。尝试将属性名称和mappedBy引用更改为小写。另外，您可以尝试向注释中添加一些参数，就像我的示例一样。我对 hibernate 比较陌生，并且知道注释中的一个简单单词可能很重要。
在我的家长类，我有......
@OneToMany(fetch=FetchType.LAZY, mappedBy="cobpresGestion")
@Cascade({CascadeType.ALL})
public Set<CobpresOptionDet> getCobpresOptionDets() {
return this.cobpresOptionDets;
}
在我的 child 类，我有......
@ManyToOne(fetch=FetchType.LAZY, optional=false)
@JoinColumn(name="IDCOBPRES", nullable=false, insertable=true, updatable=true)
public CobpresGestion getCobpresGestion() {
return this.cobpresGestion;
}
关于java.lang.ExceptionInInitializerError 和 org.hibernate.AnnotationException : mappedBy reference an unknown target entity property:，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31354606/