hibernate annotations with composite primary key

I want to know how to use hibernate annotations in case of composite primary key in one table. I tried like this, I have created a table without primary key. By default mssql has created a composite primary key with all the columns of the table.

table: create table student(sid number(5),sname varchar2(20),age number(3));

And i have created 2 pojo classes like this,

Student.java:

@Entity @Table(name="student_tbl") @IdClass(StudentID.class) public class Student implements Serializable{ /** * */ private static final long serialVersionUID = -7007299156855950071L; private StudentID id;
```
public StudentID getId() {
    return id;
}


public void setId(StudentID id) {
    this.id = id;
}
```
}
- StudentID.java
import javax.persistence.Column; import javax.persistence.Embeddable; import javax.persistence.OneToMany; @Embeddable public class StudentID {
```
long sid;
String name;
double age;
@OneToMany
public long getSid() {
    return sid;
}
public void setSid(long sid) {
    this.sid = sid;
}
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public double getAge() {
    return age;
}
public void setAge(double age) {
    this.age = age;
}
```
}

And i have created a Store.java to store a record inside the mssql database.
- Store.java
import org.hibernate.Session; import org.hibernate.Transaction;

public class Store { public static void main(String[] args) { Session session=HibernateSessionFactory.getSession(); Transaction tx=session.beginTransaction(); Student studentObject=new Student(); StudentID studentIDObject=new StudentID(); studentIDObject.setSid(123456l); studentIDObject.setName("suresh"); studentIDObject.setAge(24d); studentObject.setId(studentIDObject); session.save(studentObject); tx.commit(); session.close(); } }

When i ran the above java file, i got following exception,

%%%% Error Creating SessionFactory %%%% org.hibernate.AnnotationException: No identifier specified for entity: com.tbss.Student at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:672) at org.hibernate.cfg.AnnotationConfiguration.processArtifactsOfType(AnnotationConfiguration.java:546) at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:291) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1333) at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867) at com.tbss.HibernateSessionFactory.(HibernateSessionFactory.java:32) at com.tbss.Store.main(Store.java:8) %%%% Error Creating SessionFactory %%%% org.hibernate.AnnotationException: No identifier specified for entity: com.tbss.Student at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:672) at org.hibernate.cfg.AnnotationConfiguration.processArtifactsOfType(AnnotationConfiguration.java:546) at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:291) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1333) at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867) at com.tbss.HibernateSessionFactory.rebuildSessionFactory(HibernateSessionFactory.java:71) at com.tbss.HibernateSessionFactory.getSession(HibernateSessionFactory.java:54) at com.tbss.Store.main(Store.java:8) Exception in thread "main" java.lang.NullPointerException at com.tbss.Store.main(Store.java:9)

Please help me in resolving this problem. And please send the answer to following mail id

View Answers

June 17, 2011 at 3:17 PM

Please go through the following link:

Hibernate Notations

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