package com.cnb.autodb;

package com.cnb.autodb;

import java.io.Serializable;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

/**
* @author erpula
*
*/
@Entity
@Table(name = "EMPLOYEE")
public class Employee implements Serializable{

/**
*
*/
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "id")
private int id;

@Column(name = "emp_name")
private String emp_name;

@Column(name = "is_manager")
private boolean is_manager;

@Column(name = "emp_sex")
private String emp_sex;
/**
* @return the id
*/

public int getId() {
return id;
}
/**
* @param id the id to set
*/
public void setId(int id) {
this.id = id;
}
/**
* @return the emp_name
*/
public String getEmp_name() {
return emp_name;
}
/**
* @param empName the emp_name to set
*/
public void setEmp_name(String empName) {
emp_name = empName;
}
/**
* @return the is_manager
*/
public boolean isIs_manager() {
return is_manager;
}
/**
* @param isManager the is_manager to set
*/
public void setIs_manager(boolean isManager) {
is_manager = isManager;
}
/**
* @return the emp_sex
*/
public String getEmp_sex() {
return emp_sex;
}
/**
* @param empSex the emp_sex to set
*/
public void setEmp_sex(String empSex) {
emp_sex = empSex;
}

}


persistence.xml

<persistence-unit name="Employee">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<class>com.cnb.autodb.Employee</class>
<properties>
<property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/sravan" />
<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" />
<property name="hibernate.connection.username" value="root" />
<property name="hibernate.connection.password" value="mysql-cnb" />
<property name="hibernate.archive.autodetection" value="class" />
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.format_sql" value="true" />
<property name="hbm2ddl.auto" value="create" />
</properties>
</persistence-unit>



Main Class


public static void main(String[] args) {
// TODO Auto-generated method stub
EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory("Employee");
EntityManager entityManager = entityManagerFactory.createEntityManager();
entityManager.getTransaction().begin();
Employee employee = new Employee();
employee.setId(1);
employee.setEmp_name("PRASHANTH");
employee.setEmp_sex("M");
employee.setIs_manager(false);
entityManager.persist(employee);
}


returning an error code

[color=#FF0000]log4j:WARN No appenders could be found for logger (org.hibernate.type.BasicTypeRegistry).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "main" javax.persistence.PersistenceException: org.hibernate.PersistentObjectException: detached entity passed to persist: com.cnb.autodb.Employee
at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:614)
at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:226)
at com.cnb.autodb.Test.main(Test.java:22)
Caused by: org.hibernate.PersistentObjectException: detached entity passed to persist: com.cnb.autodb.Employee
at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:127)
at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:61)
at org.hibernate.impl.SessionImpl.firePersist(SessionImpl.java:808)
at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:782)
at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:786)
at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:220)
... 1 more









Could Some One Help Me out :(

In your entity, the "id" attribute is configured as a generated value. Therefore, Hibernate expects the "id" of the object to be null when you call EntityManager#persist. Commenting the line in which you set the "id" should solve the problem.

Thanx my problem is solved i hav already done the same .... :)