hi
i want to use hibernate in java+postgresql
but when i run it receive NullPointerException
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.postgresql.Driver;
public class FirstExample {
public static void main(String[] args) {
Session session = null;
try{
SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
session =sessionFactory.openSession();
Transaction tx = session.beginTransaction();
System.out.println("Inserting Record");
Contact contact = new Contact();
contact.setId(10);
contact.setFirstName("kibo");
contact.setLastName("omid");
session.update(contact);
tx.commit();
Book book = new Book();
book.setStrBookName("Test");
session.save(book);
tx.commit();
System.out.println("Done");
}catch(Exception e){
System.out.println(e.getMessage());
e.printStackTrace();
}finally{
session.flush();
session.close();
System.out.println("Done");
}
}
}public class Contact {
private String firstName;
private String lastName;
private String email;
private long id;
/**
* @return Email
*/
public String getEmail() {
return email;
}
/**
* @return First Name
*/
public String getFirstName() {
return firstName;
}
/**
* @return Last name
*/
public String getLastName() {
return lastName;
}
/**
* @param string Sets the Email
*/
public void setEmail(String string) {
email = string;
}
/**
* @param string Sets the First Name
*/
public void setFirstName(String string) {
firstName = string;
}
/**
* @param string sets the Last Name
*/
public void setLastName(String string) {
lastName = string;
}
/**
* @return ID Returns ID
*/
public long getId() {
return id;
}
/**
* @param l Sets the ID
*/
public void setId(long l) {
id = l;
}
}public class Book {
private long lngBookId;
private String strBookName;
/**
* @return Returns the lngBookId.
*/
public long getLngBookId() {
return lngBookId;
}
/**
* @param lngBookId The lngBookId to set.
*/
public void setLngBookId(long lngBookId) {
this.lngBookId = lngBookId;
}
/**
* @return Returns the strBookName.
*/
public String getStrBookName() {
return strBookName;
}
/**
* @param strBookName The strBookName to set.
*/
public void setStrBookName(String strBookName) {
this.strBookName = strBookName;
}
}<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="roseindia.tutorial.hibernate.Contact" table="CONTACT">
<id name="id" type="long" column="ID" >
<generator class="assigned"/>
</id>
<property name="firstName">
<column name="FIRSTNAME" />
</property>
<property name="lastName">
<column name="LASTNAME"/>
</property>
<property name="email">
<column name="EMAIL"/>
</property>
</class>
<class name="roseindia.tutorial.hibernate.Book" table="book">
<id name="lngBookId" type="long" column="id" >
<generator class="increment"/>
</id>
<property name="strBookName">
<column name="bookname" />
</property>
</class>
<class name="roseindia.tutorial.hibernate.Insurance" table="insurance">
<id name="lngInsuranceId" type="long" column="ID" >
<generator class="increment"/>
</id>
<property name="insuranceName">
<column name="insurance_name" />
</property>
<property name="investementAmount">
<column name="invested_amount" />
</property>
<property name="investementDate">
<column name="investement_date" />
</property>
</class>
</hibernate-mapping><?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">
org.postgresql.Driver
</property>
<property name="hibernate.connection.url">
jdbc:postgresql://127.0.0.1:5432/postgres
</property>
<property name="hibernate.connection.username">postgres</property>
<property name="hibernate.connection.password">mypass</property>
<property name="hibernate.connection.pool_size">10</property>
<property name="show_sql">true</property>
<property name="hibernate.hbm2ddl.auto">update</property>
<!-- Mapping files -->
<property name="myeclipse.connection.profile">
org.postgresql.Driver
</property>
<property name="connection.url">
jdbc:postgresql://127.0.0.1:5432/postgres
</property>
<property name="connection.username">postgres</property>
<property name="connection.password">1</property>
<property name="connection.driver_class">
org.postgresql.Driver
</property>
<property name="dialect">
org.hibernate.dialect.PostgreSQLDialect
</property>
<mapping resource="contant.hbm.xml"></mapping>
</session-factory>
</hibernate-configuration>