Hello Frnds,

I was trying execute simple mappling between Student and College. .
Every time I am getting the same error ~
Caused by: org.hibernate.MappingException: Could not determine type for: java.util.List, at table: College, for columns: [org.hibernate.mapping.Column(students)]

CODE Perspective:
I made two classes STUDENT:
@Entity
public class Student {
private String StudentName;
@Id
@GeneratedValue(strategy=IDENTITY)
private String StudentId;
private College college;

public String getStudentName() {
return StudentName;
}
public void setStudentName(String studentName) {
StudentName = studentName;
}
public String getStudentId() {
return StudentId;
}
public void setStudentId(String studentId) {
StudentId = studentId;
}

@ManyToOne
@JoinColumn(name = "college_id")
public College getCollege() {
return college;
}
public void setCollege(College college) {
this.college = college;
}
}

AND COLLEGE:

@Entity
public class College {
@Id
@GeneratedValue(strategy=IDENTITY)
private String CollegeId;
private String CollegeName;
private List<Student> students;

public String getCollegeId() {
return CollegeId;
}
public void setCollegeId(String collegeId) {
CollegeId = collegeId;
}
public String getCollegeName() {
return CollegeName;
}
public void setCollegeName(String collegeName) {
CollegeName = collegeName;
}

@OneToMany(targetEntity = Student.class, mappedBy = "college", cascade = CascadeType.ALL, fetch = FetchType.EAGER)
public List<Student> getStudents() {
return students;
}
public void setStudents(List<Student> students) {
this.students = students;
}
}

----------
MAIN class :
sessionFactory = new Configuration().configure()
.buildSessionFactory();
transaction = session.beginTransaction();

College college = new College();
college.setCollegeName("NewYork College");
Student s1 = new Student();
s1.setStudentName("Vikram");
s1.setCollege(college);
Student s2 = new Student();
s2.setStudentName("Sita");
s2.setCollege(college);
session.save(college);
session.save(s1);
session.save(s2);
transaction.commit();
session.close();
-----------------------------
I am using Hibernate
hibernate-3.6.2
hibernate-jpa-2.0-api-1.0.0.Final
hibernate-validator-4.1.0.Final
MYSQL
----------------
Please suggest where I could be wrong..!! I need your help urgently.. Plz.. !!

Use @...on column or getter not both of them.

要不在列上使用annotation ,要不就在get方法上使用annotation，不要俩种都混着用。


BWT ，do you speak chinese?

Communication is so difficult,i can't spell some words.

Check this reference may be useful to you

Hibernate One To Many Annotation Example
Hibernate Many To One Annotation Example

Good luck

Thanks strjames !! :-)

You welcome friend :-)

That's also I need.Thank you.

hello all, I have followed the sample in many to one relation, and when I save the elements in the 'many' side, I have this error:
a different object with the same identifier value was already associated with the session

My code is like:
tx = session.beginTransaction();
logclass LogClass = new logclass();

LogClass.setdFecha(dFecha);
LogClass.setsClase(sClase);
LogClass.setsMensaje(sMensaje);
LogClass.setiIdPrioridad(Integer.parseInt(sPrioridad));
LogClass.setsServidor(sServidor);
LogClass.setiIdCodigoError(Integer.parseInt(sCodigoError) );
LogClass.setsDetalle(sDetalle);

int id = (Integer)session.save(LogClass);

for( int i=0; i<vParametros.size() ; i ++ ){
Vector<String> vTemp= (Vector)vParametros.elementAt(i);
logparametrosclass logparam = new logparametrosclass();
logparam.setsParam((String)vTemp.elementAt(0));
logparam.setsValor((String)vTemp.elementAt(1));
logparam.setLog(LogClass);
session.save(logparam);

}

Could anyone give me a help?
thanks ins advance