session null

[Samanthi perera]

this is my Contact.java

package roseindia.tutorial.hibernate;

public class Contact {
	private String firstName;
	private String lastName;
	private String email;
	private long id;
	
	public String getEmail() {
		return email;
	}
	
	public String getFirstName() {
		return firstName;
	}

	public String getLastName() {
		return lastName;
	}
	
	public void setEmail(String string) {
		email = string;
	}
	
	public void setFirstName(String string) {
		firstName = string;
	}
	
	public void setLastName(String string) {
		lastName = string;
	}
	
	public long getId() {
		return id;
	}

	
	public void setId(long l) {
		id = l;
	}

}

this is contact.hbm.xml

<?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>
</hibernate-mapping>

this is config.xml

<?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">

			com.mysql.jdbc.Driver</property>
		<property name="hibernate.connection.url">

			jdbc:mysql://localhost/hibernatetutorial</property>
		<property name="hibernate.connection.username">root</property>
		<property name="hibernate.connection.password"></property>
		<property name="hibernate.connection.pool_size">10</property>
		<property name="show_sql">true</property>
		<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
		<property name="hibernate.hbm2ddl.auto">update</property>
		<!-- Mapping files -->
		<mapping resource="contact.hbm.xml" />
	</session-factory>
</hibernate-configuration>

this is main class

package roseindia.tutorial.hibernate;

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 sessionnn");
      
      SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
       session =sessionFactory.openSession();
       
        	System.out.println("After sessionnn");
       
        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){
    	e.printStackTrace();
      System.out.println(e.getMessage());
    }finally{
      // Actual contact insertion will happen at this step
      session.flush();
      session.close();

      }
    
  }
}   
 

this is the output

Before sessionnn
Jan 23, 2010 11:00:45 AM org.hibernate.cfg.Environment <clinit>
INFO: Hibernate 3.0rc1
Jan 23, 2010 11:00:45 AM org.hibernate.cfg.Environment <clinit>
INFO: hibernate.properties not found
Jan 23, 2010 11:00:45 AM org.hibernate.cfg.Environment <clinit>
INFO: using CGLIB reflection optimizer
Jan 23, 2010 11:00:45 AM org.hibernate.cfg.Environment <clinit>
INFO: using JDK 1.4 java.sql.Timestamp handling
Jan 23, 2010 11:00:45 AM org.hibernate.cfg.Configuration configure
INFO: configuring from resource: /hibernate.cfg.xml
Jan 23, 2010 11:00:45 AM org.hibernate.cfg.Configuration getConfigurationInputStream
INFO: Configuration resource: /hibernate.cfg.xml
Exception in thread "main" java.lang.NullPointerException
	at roseindia.tutorial.hibernate.FirstExample.main(FirstExample.java:33)

that means session doesn't create.
Where is the Error?

I have already added hibernate3.jar,mysql-connector-java-3.0.16-ga-bin.jar and commons-logging-1.0.4.jar to Build path

[David Newton]

Turn up logging to debug level so you can see what's wrong.

[Samanthi perera]

I place a Debug pointer at this line
SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
session =sessionFactory.openSession();

and then press F6.
this is i got.
I can't understand what happen?

FirstExample [Java Application]	
	roseindia.tutorial.hibernate.FirstExample at localhost:22730	
		Thread [main] (Suspended)	
			ClassNotFoundException(Throwable).<init>(String, Throwable) line: 217	
			ClassNotFoundException(Exception).<init>(String, Throwable) line: not available	
			ClassNotFoundException.<init>(String) line: not available	
			ClassLoader.findBootstrapClass(String) line: not available [native method]	
			Launcher$ExtClassLoader(ClassLoader).findBootstrapClass0(String) line: not available	
			Launcher$ExtClassLoader(ClassLoader).loadClass(String, boolean) line: not available	
			Launcher$AppClassLoader(ClassLoader).loadClass(String, boolean) line: not available	
			Launcher$AppClassLoader.loadClass(String, boolean) line: not available	
			Launcher$AppClassLoader(ClassLoader).loadClass(String) line: not available	
			Launcher$AppClassLoader(ClassLoader).loadClassInternal(String) line: not available	
			FirstExample.main(String[]) line: 15	
	C:\Program Files\Java\jre1.6.0\bin\javaw.exe (Jan 23, 2010 7:59:26 PM)	

[Samanthi perera]

Still I am unable to fine where is the Error?

[Samanthi perera]

connection.driver_class: a database specific setting, this setting defines the database driver, in the form of a Java class file, used by Hibernate to connect to the database. It should be mentioned that the class file you specify as the driver_class must actually be on the CLASSPATH, or Hibernate will not be able to find it at runtime.

I am using Eclips ,So i think it is not need to add mysql connector to CLASSPATH ?
I already added mysql-connector.jar as a library.

[Jose Ayerdis]

i think that it might not finding the hibernate.cfg the you have it on your root source package??... can you handle over a eclipse proyect so i can see if i get the same error??

[Samanthi perera]

Here is my folder stucture
http://asliyanage.blogspot.com/2010/01/blog-post.html

[Jose Ayerdis]

try forcing the path file with an absolute path let see what happens something like this

File myFile = new File("C:\\Proyect\\src\hibernate.cfg.xml");
sessions = new Configuration().configure(myFile).buildSessionFactory(); 

[Samanthi perera]

here is my file path

D:\PROJECT\Gwt-eclips\hibernateexample\src\roseindia\tutorial\hibernate\hibernate.cfg.xml

when i attempt to use this it says invalid escap sequence

File myFile = new File("D:\PROJECT\Gwt-eclips\hibernateexample\src\roseindia\tutorial\hibernate\hibernate.cfg.xml");  

Here is a Scrennshot
http://asliyanage.blogspot.com/2010/01/blog-post_24.html

[Jose Ayerdis]

try using the double backslash

D:\\PROJECT\\Gwt-eclips\\hibernateexample\\src\\roseindia\\tutorial\\hibernate\\hibernate.cfg.xml

[Mark E Hansen]

Jose Ayerdis wrote:try using the double backslash

D:\\PROJECT\\Gwt-eclips\\hibernateexample\\src\\roseindia\\tutorial\\hibernate\\hibernate.cfg.xml

Or forward slashes. I always use forward slashes for file separators in Java source, regardless of the platform on which the application should run.

[David Newton]

Or File.pathSeparator.

[Christian Dillinger]

Put hibernate.cfg.xml into your src-folder and Hibernate will find it.

[Samanthi perera]

I change my class now

package roseindia.tutorial.hibernate;

import java.io.File;

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 sessionnn");
      
    	File myFile = new File("D:\\PROJECT\\Gwt-eclips\\hibernateexample\\src\\roseindia\\tutorial\\hibernate\\hibernate.cfg.xml");  
    	
      SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
       session =sessionFactory.openSession();
       
        	System.out.println("After sessionnn");
       
        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){
    	e.printStackTrace();
      System.out.println(e.getMessage());
    }finally{
      // Actual contact insertion will happen at this step
      session.flush();
      session.close();

      }
    
  }
}

here still problem

Before sessionnn
Jan 25, 2010 12:55:29 PM org.hibernate.cfg.Environment <clinit>
INFO: Hibernate 3.0rc1
Jan 25, 2010 12:55:29 PM org.hibernate.cfg.Environment <clinit>
INFO: hibernate.properties not found
Jan 25, 2010 12:55:29 PM org.hibernate.cfg.Environment <clinit>
INFO: using CGLIB reflection optimizer
Jan 25, 2010 12:55:29 PM org.hibernate.cfg.Environment <clinit>
INFO: using JDK 1.4 java.sql.Timestamp handling
Jan 25, 2010 12:55:29 PM org.hibernate.cfg.Configuration configure
INFO: configuring from resource: /hibernate.cfg.xml
Jan 25, 2010 12:55:29 PM org.hibernate.cfg.Configuration getConfigurationInputStream
INFO: Configuration resource: /hibernate.cfg.xml
Jan 25, 2010 12:55:29 PM org.hibernate.cfg.Configuration getConfigurationInputStream
WARNING: /hibernate.cfg.xml not found
org.hibernate.HibernateException: /hibernate.cfg.xml not found
	at org.hibernate.cfg.Configuration.getConfigurationInputStream(Configuration.java:1205)
	at org.hibernate.cfg.Configuration.configure(Configuration.java:1229)
	at org.hibernate.cfg.Configuration.configure(Configuration.java:1216)
	at roseindia.tutorial.hibernate.FirstExample.main(FirstExample.java:19)
/hibernate.cfg.xml not found
Exception in thread "main" java.lang.NullPointerException
	at roseindia.tutorial.hibernate.FirstExample.main(FirstExample.java:37)

[Christian Dillinger]

It's useless to get a File-Object if you don't use ist... Take a look into the Hibernate api-doc, where to put the path to the config-file. And again: just put it into the src-Folder and it works. Hibernate looks for a file named hibernate.cfg.xml there. You only have to configure the path if you don't put into the "root"-folder.

[Samanthi perera]

I am using eclips.How to set path in eclips

[Christian Dillinger]

Do you read the answers posted here?!?

If you put hibernate.cfg.xml into the src-folder and not into any package, Hibernate will find it. If you want to put into a special package take a look into the API and find out that that you have to use new Configuration().configure(SET THE RIGHT FILE *HERE*)....

[Samanthi perera]

ok
I put it.
now path of config file is
D:\PROJECT\Gwt-eclips\hibernateexample\src\hibernate.cfg.xml

here is a Screenshot
http://asliyanage.blogspot.com/2010/01/blog-post_25.html



Still i got this error

Before sessionnn
Jan 25, 2010 1:38:02 PM org.hibernate.cfg.Environment <clinit>
INFO: Hibernate 3.0rc1
Jan 25, 2010 1:38:02 PM org.hibernate.cfg.Environment <clinit>
INFO: hibernate.properties not found
Jan 25, 2010 1:38:02 PM org.hibernate.cfg.Environment <clinit>
INFO: using CGLIB reflection optimizer
Jan 25, 2010 1:38:02 PM org.hibernate.cfg.Environment <clinit>
INFO: using JDK 1.4 java.sql.Timestamp handling
Jan 25, 2010 1:38:02 PM org.hibernate.cfg.Configuration configure
INFO: configuring from resource: /hibernate.cfg.xml
Jan 25, 2010 1:38:02 PM org.hibernate.cfg.Configuration getConfigurationInputStream
INFO: Configuration resource: /hibernate.cfg.xml
Exception in thread "main" java.lang.NullPointerException
	at roseindia.tutorial.hibernate.FirstExample.main(FirstExample.java:37)

[Paul Sturrock]

What happens on line 37 of the class FirstExample?

[Samanthi perera]

session.flush();

[Paul Sturrock]

So you have no session, in which case you will have a stack trace explaining why (assuming you are running the code you have posted above).