Hibernate--->Sqlserver

[Ganeshkumar cheekati]

Hi,

I am trying to connect to sql server database from hibernate3 which i am doing it manually but not with eclipse.
As a result i am getting nullpointerexception like

before starting...
Exception in thread main java.lang.NullPointerException
at FirstExample.main(FirstExample.java:33)

while running the below program

jar files:
1)hibernate3.jar
2)hibernate-core.jar
3)jtds-1.2.2.jar

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class FirstExample {
  public static void main(String[] args) {
    Session session = null;

    try{
		System.out.println("before starting...");
      // This step will read hibernate.cfg.xml and prepare hibernate for use
      SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
	  System.out.println("sessionfactory status is"+sessionFactory);
       session =sessionFactory.openSession();
	   System.out.println("session opened");
        //Create new instance of Contact and set values in it by reading them from form object
         System.out.println("Inserting Record");
        Contact contact = new Contact();
        contact.setId(3);
        contact.setFirstName("Deepak");
        contact.setLastName("Kumar");
        contact.setEmail("[e-mail]");
        session.save(contact);
        System.out.println("Done");
    }catch(Exception e){
      System.out.println(e.getMessage());
    }finally{
      // Actual contact insertion will happen at this step
      session.flush();
      session.close();

      }
    
  }
} 

and

hibernate.cfg.xml file contains

<?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">

	net.sourceforge.jtds.jdbc.Driver</property>
      <property name="hibernate.connection.url">
		jdbc:jtds:sqlserver://localhost:1433;DatabaseName=hibernatetutorial;SelectMethod=direct</property>      <property name="hibernate.connection.username">sa</property>
      <property name="hibernate.connection.password">genpact</property>
      <property name="hibernate.connection.pool_size">10</property>
      <property name="show_sql">true</property>
      <property name="dialect">org.hibernate.dialect.SQLServerDialect </property>
      <property name="hibernate.hbm2ddl.auto">update</property>
      <!-- Mapping files -->
      <mapping resource="contact.hbm.xml"/>
</session-factory>
</hibernate-configuration>

and contact.hbm.xml file is

<?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="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>
</hibernate-mapping>

and
contact.java is

/**
 * @author Deepak Kumar
 *
 * Java Class to map to the datbase Contact Table
 */
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;
  }

} 

Can anyone tell me where i did mistake?

thanks in advance.

[Henrique Ordine]

I'm not sure I can help, but I might if you tell me which line is throwing the NPE.

[Ganeshkumar cheekati]

i am getting nullpointerexception like

before starting...
Exception in thread main java.lang.NullPointerException
at FirstExample.main(FirstExample.java:33)

[Henrique Ordine]

Line 33 in FirstExample.java is an empty line. Maybe you should recompile your code?

[Ganeshkumar cheekati]

there are some blank lines so it showed line no.33

Now its showing in line no.27 session.flush();

[Paul Sturrock]

So you have no session? What do the logs say regarding your Hibernate configuration? If you can't get a session, something is misconfigured there.

[Jimmy Clark]

Move these two lines. Place directly after call to save().

 session.flush();   
 session.close(); 

[Paul Sturrock]

Jimmy Clark wrote:Move these two lines. Place directly after call to save().

 session.flush();   
 session.close(); 

Why?

[Jimmy Clark]

Why not?

[Ganeshkumar cheekati]

Its not working even i place these two lines after the session.save()

[Paul Sturrock]

Jimmy Clark wrote:Why not?

Because its neither here nor there with regards to Ganeshkumar's problem; why do you think it would change the issue? If session is null when flush is called, it is also null when save is called. Also, moving it from the finally block will leave Sessions open if exceptions occur; where this code is currently is the best place for it.

[Paul Sturrock]

Ganeshkumar cheekati wrote:Its not working even i place these two lines after the session.save()

What other errors do you have in the log? The session will be null if the configuration was wrong, so something is not right there. The Jar files you list for example look wrong.

[Ganeshkumar cheekati]

Hi paul,
i am using three jars
1)hibernate3.jar
2)hibernate-core.jar
3)jtds-1.2.2.jar

to run this code and configuration file is

<?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">   
  
    net.sourceforge.jtds.jdbc.Driver</property>   
      <property name="hibernate.connection.url">   
        jdbc:jtds:sqlserver://localhost:1433;DatabaseName=hibernatetutorial;SelectMethod=direct</property>      <property name="hibernate.connection.username">sa</property>   
      <property name="hibernate.connection.password">genpact</property>   
      <property name="hibernate.connection.pool_size">10</property>   
      <property name="show_sql">true</property>   
      <property name="dialect">org.hibernate.dialect.SQLServerDialect </property>   
      <property name="hibernate.hbm2ddl.auto">update</property>   
      <!-- Mapping files -->   
      <mapping resource="contact.hbm.xml"/>   
</session-factory>   
</hibernate-configuration>  

i am getting null value for session so Is there any problem in configuration file ?

[Ganesh Shirsat]

Hi

have you tried this url using Connection object.

is it working fine.

jdbc:jtds:sqlserver://localhost:1433;DatabaseName=hibernatetutorial;SelectMethod=direct

according to jtds there is no selectMethod property.

selectMethod property are used in MS Jdbc

http://jtds.sourceforge.net/faq.html

please check that, is it working properly using Connection Object or not?.

[Paul Sturrock]

This is a good suggestion, though the error message that is occurring before your NullPointerException will tell you exactly what the issue is. If you could post that please?

[Ganeshkumar cheekati]

I am able to connect to sqlserver using jtds driver with selectmethod property from my applications so i dont think that it is problem with selectmethod property.

After executing my program i am getting output as

before starting....

NullPointerException

[Paul Sturrock]

Check your logging. Hibernate configuration does not fail silently.