I am doing a web application using annotations to map a class and a table instead of using*.hbm.xml file.
The class is like the following:

@Table(name="userprofile")

public class UserDescriptor {
private String user = new String();
private String password = new String();
private String name = new String();
private String email = new String();

public UserDescriptor() {

}
public void setUser(String string) {
user = string;
}

public void setPassword(String string) {
password = string;
}
public void setName(String string) {
name = string;
}

public void setEmail(String string) {
email = string;
}

@Id
@Column(name="user_id")
public String getUser() {
return user;
}

@Column(name="password")
public String getPassword() {
return password;
}

@Column(name="display_name")
public String getName() {
return name;
}

@Column(name="email")
public String getEmail() {
return email;
}
}

And there is a function like the following:

public void insertUser(String user, String password, String name, String email) {
SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
Session session = sessionFactory.openSession();
session.beginTransaction();
UserDescriptor userDescriptor = new UserDescriptor();
userDescriptor.setUser(user);
userDescriptor.setPassword(password);
userDescriptor.setName(name);
userDescriptor.setEmail(email);
session.save(userDescriptor);
session.getTransaction().commit();
}

But the problem is that there is an error when calling the above function.The error is

nested exception is org.hibernate.MappingException: Unknown entity: org.springframework.samples.imagedb.UserDescriptor

Your entity must also contain the @Entity annotation. @Table alone is not enough.

Hi,
I am sorry .Actually it is a problem with copy paste ( missed @Entity at the time of copy paste ).Actually my code contains @Entity before @Table annotation. With @Entity the same error occurs.

Do you have a persistence.xml file and does that tell Hibernate how to find the entities?

No I dont have persistence.xml file.From this, I guess I have to import some other packages instead of packages that I have imported in my project.

import javax.persistence.Column;
import javax.persistence.Id;
import javax.persistence.Table;

I imported the above classes .In this case of with out using persistence.xml, please tell me what will be the packages / classes I have to import and what will be the modifications I have to made. Or please tell me what can i do with persistence.xml, how it will be created, its details etc.