Hibernate self-reference annotation

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<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <!-- <session-factory> <property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property> hibernate word is optional <property name="connection.url">jdbc:oracle:thin:@localhost:1521:ORCL</property> <property name="hibernate.connection.username">kcv</property> <property name="hibernate.connection.password">kcv</property> <property name="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</property> <property name="show_sql">true</property> <mapping resource="Employee.hbm.xml"/> </session-factory> --> <session-factory> <property name="hibernate.current_session_context_class">thread</property> <property name="hbm2ddl.auto">create</property> <property name="dialect">org.hibernate.dialect.PostgreSQLDialect</property> <property name="connection.url">jdbc:postgresql://localhost:5432/hibernate</property> <property name="connection.username">postgres</property> <property name="connection.password">password</property> <property name="connection.driver_class">org.postgresql.Driver</property> <property name="show_sql">true</property> <property name="format_sql">true</property> <property name="use_sql_comments">true</property> <mapping class="com.cv.hibernate.selfreference.annotation.model.Employee"/> </session-factory> </hibernate-configuration>

package com.cv.hibernate.selfreference.annotation.model; import java.util.HashSet; import java.util.Set; import javax.persistence.CascadeType; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.JoinColumn; import javax.persistence.ManyToOne; import javax.persistence.OneToMany; import javax.persistence.Table; /**  * @author Chandra Vardhan  */ @Entity @Table(name = "TBL_EMPLOYEE_SELF") public class Employee {   @Id   @Column(name = "EMPLOYEE_ID")   @GeneratedValue   private Long employeeId;   @Column(name = "FIRSTNAME")   private String firstName;;   @Column(name = "LASTNAME")   private String lastName;   @ManyToOne(cascade = { CascadeType.ALL })   @JoinColumn(name = "manager_id")   private Employee manager;   @OneToMany(mappedBy = "manager")   private Set<Employee> subordinates = new HashSet<Employee>();   public Employee() {   }   public Employee(String firstname, String lastname) {     this.firstName = firstname;     this.lastName = lastname;   }   public Set<Employee> getSubordinates() {     return subordinates;   }   public void setSubordinates(Set<Employee> subordinates) {     this.subordinates = subordinates;   }   @Override   public boolean equals(Object emp) {     if (emp instanceof Employee) {       Employee employee = (Employee) emp;       if (this.firstName.equals(employee.getFirstname()) && this.lastName.equals(employee.getLastname()))         return true;     }     return false;   }   @Override   public int hashCode() {     return this.firstName.hashCode() + this.lastName.hashCode();   }   public Long getEmployeeId() {     return employeeId;   }   public void setEmployeeId(Long employeeId) {     this.employeeId = employeeId;   }   public String getFirstname() {     return firstName;   }   public void setFirstName(String firstname) {     this.firstName = firstname;   }   public String getLastname() {     return lastName;   }   public void setLastName(String lastname) {     this.lastName = lastname;   }   public Employee getManager() {     return manager;   }   public void setManager(Employee manager) {     this.manager = manager;   } }

package com.cv.hibernate.selfreference.annotation; import org.apache.log4j.Logger; /** @author Chandra Vardhan */ import org.hibernate.Session; import com.cv.hibernate.selfreference.annotation.model.Employee; import com.cv.hibernate.selfreference.annotation.util.HibernateUtil; public class TestClient {   private final static Logger logger = Logger.getLogger(TestClient.class);   public static void main(String[] args) {     Session session = HibernateUtil.getSession();     session.beginTransaction();     Employee manager1 = new Employee("Venu", "K");     Employee employee1 = new Employee("Venu", "M");     Employee employee2 = new Employee("CV", "K");     employee1.setManager(manager1);     employee2.setManager(manager1);     session.save(employee1);     session.save(employee2);     session.getTransaction().commit();     logger.info("Saved successfully...");     HibernateUtil.closeSession();   } }

package com.cv.hibernate.selfreference.annotation.util; import org.apache.log4j.Logger; import org.hibernate.HibernateException; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.boot.registry.StandardServiceRegistryBuilder; import org.hibernate.cfg.Configuration; /**  * Configures and provides access to Hibernate sessions, tied to the current  * thread of execution. Follows the Thread Local Session pattern, see  * {@link http://hibernate.org/42.html }.  */ public class HibernateUtil {      private final static Logger logger = Logger.getLogger(HibernateUtil.class);   /**    * Location of hibernate.cfg.xml file. Location should be on the classpath    * as Hibernate uses #resourceAsStream style lookup for its configuration    * file. The default classpath location of the hibernate config file is in    * the default package. Use #setConfigFile() to update the location of the    * configuration file for the current session.    */   private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml";   private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();   private static Configuration configuration = new Configuration();   private static SessionFactory sessionFactory;   static {     try {       configuration = configuration.configure(CONFIG_FILE_LOCATION);       StandardServiceRegistryBuilder builder = new StandardServiceRegistryBuilder()           .applySettings(configuration.getProperties());       sessionFactory = configuration.buildSessionFactory(builder.build());       logger.info("%%%% Connection successful %%%%");     } catch (Exception e) {       logger.error("%%%% Error Creating SessionFactory %%%%");       e.printStackTrace();     }   }   private HibernateUtil() {   }   /**    * Returns the ThreadLocal Session instance. Lazy initialize the    * <code>SessionFactory</code> if needed.    *    * @return Session    * @throws HibernateException    */   public static Session getSession() throws HibernateException {     Session session = (Session) threadLocal.get();     if (session == null || !session.isOpen()) {       if (sessionFactory == null) {         rebuildSessionFactory();       }       session = (sessionFactory != null) ? sessionFactory.openSession() : null;       threadLocal.set(session);     }     return session;   }   /**    * Rebuild hibernate session factory    *    */   public static void rebuildSessionFactory() {     try {       configuration = configuration.configure(CONFIG_FILE_LOCATION);       StandardServiceRegistryBuilder builder = new StandardServiceRegistryBuilder()           .applySettings(configuration.getProperties());       sessionFactory = configuration.buildSessionFactory(builder.build());       logger.info("%%%% Connection successful %%%%");     } catch (Exception e) {       logger.error("%%%% Error Creating SessionFactory %%%%");       e.printStackTrace();     }   }   /**    * Close the single hibernate session instance.    *    * @throws HibernateException    */   public static void closeSession() throws HibernateException {     Session session = (Session) threadLocal.get();     threadLocal.set(null);     if (session != null) {       session.close();       System.exit(0);     }   }   /**    * return session factory    *    */   public static SessionFactory getSessionFactory() {     return sessionFactory;   }   /**    * return hibernate configuration    *    */   public static Configuration getConfiguration() {     return configuration;   }    }

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