ERROR as

alert : "fatal exception occured, program will exit"

and error msg :

java.lang.NullPointerException
at hibernate.net.roseindia.tutorial.hibernate.FirstExample.main(FirstExample.java:34)
Exception in thread "main"

my progrm is :

package hibernate.net.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{
// This step will read hibernate.cfg.xml and prepare hibernate for use
SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
session =sessionFactory.openSession();
//Create new instance of Contact and set values in it by reading them from form object
System.out.println("Inserting Record");
Emp emp = new Emp();
emp.setEmpNo(7999);
emp.setENAME("VIswanath");
emp.setJOB("CLERK");
emp.setMGR(7902);
emp.setHIREDATE(null);
emp.setSAL(22000.00);
emp.setCOMM(0.00);
emp.setDEPTNO(20);

session.save(emp);
System.out.println("Done");

}catch(Exception e){
System.out.println(e.getMessage());
}finally{
// Actual contact insertion will happen at this step
session.flush(); //GETTING ERROR HERE
session.close();
}
}
}

Please suggest to resolve

Thanks in advance
-KRVR

Your session object is NULL.

Didnt you have any EXCEPTION message from the line
System.out.println(e.getMessage());

Also print trace with e.printStackTrace(); which will give you more information.

[quote="bkmr_77"]Your session object is NULL.

Didnt you have any EXCEPTION message from the line
[b]System.out.println(e.getMessage()); [/b]

Also print trace with [b]e.printStackTrace();[/b] which will give you more information.[/quote]


Thanks for your reply.

But i am getting the session as

session =sessionFactory.openSession();

do you say that its getting the null instead of valid session
i have the hibernate.cfg.xml as

<?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">oracle.jdbc.driver.OracleDriver</property>
<property name="hibernate.connection.url">jdbc:oracle:thin:@192.168.68.44:1521:EXAMPLE</property>
<property name="hibernate.connection.username">scott</property>
<property name="hibernate.connection.password">tiger</property>
<property name="hibernate.connection.pool_size">10</property>
<property name="show_sql">true</property>
<property name="dialect">org.hibernate.dialect.OracleDialect</property>
<property name="hibernate.hbm2ddl.auto">update</property>
<!-- Mapping files -->
<mapping resource="emp.hbm.xml"/>
</session-factory>
</hibernate-configuration>

is it invalid ?
please suggest.

Thanks

I cant say if your configuration file is invalid, atleast in theory it looks good. If you are using oracle10g as db then better use another dialect as below:

<property name="dialect">org.hibernate.dialect.Oracle9Dialect</property>


I just put extra if condition on session == null below to see if your session is really NULL. Also I moved session.flush() from finally into try block as below.



Also if you can provide stack trace, it will give information as to why you are getting such problem. Its a better idea to push

Hi,
finally i have traced the error as you said, i got the folowing error.

java.lang.NullPointerException
null
at hibernate.net.roseindia.tutorial.hibernate.FirstExample.main(FirstExample.java:45)
java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
at org.hibernate.cfg.Configuration.<clinit>(Configuration.java:111)
at hibernate.net.roseindia.tutorial.hibernate.FirstExample.main(FirstExample.java:17)
Exception in thread "main"

so getting at the following line

SessionFactory sessionFactory =new Configuration().configure().buildSessionFactory();

so do application is finding my configuration file or not?

Thanks for your followup

With these 2 lines of information and above posts information I cant comment on anything unless you provide required information( atleast error stack trace )

[PS: After seeing the error I thought you added required commons-logging.jar file in your classpath. If not, please do it as calin pointed out in the below post. Secondly, never hide any exception with simple println statements instead you can print complete trace as it will give more information and save a lot of time]

Hi,
From your last post:


you can see that the program is looking for LogFactory class from commons-logging.jar library.
So I guess that you don't have the library in your classpath. The library can be found into your hibernate distribution into the lib directory.

You have to put in the program classpath all required libraries from the hibernate/lib directory.

I hope this help.

Calin.

After you get the logging set up, it may still fail because you're not using a transaction. Try surrounding the "talking to the database" bits with a transaction. Before session.save(emp), put session.beginTransaction(). After session.flush(), put session.getTransaction().commit().