Hi,
I developed an application which is successfully inserting name and id(primary key) in a TESTTABLE .Then i developed an application which should insert only name(single column) in NAMETABLE,but it is showing an error


log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Error reading resource: test.hbm.xml
Exception in thread "main" java.lang.NullPointerException
at roseindia.tutorial.hibernate.NameExample.main(NameExample.java:33)


Is it mandatory to have <id> in resource file?

My Files are

1)package roseindia.tutorial.hibernate;

public class NameTable {
private String name;
public String getName() {
return name;
}
public void setName(String string) {
name = string;
}
}


2)
package roseindia.tutorial.hibernate;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
public class NameExample {
public static void main(String[] args) {
Session session = null;
try {
SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
session = sessionFactory.openSession();
System.out.println("Inserting Record");
Transaction tx = session.beginTransaction();
NameTable contact = new NameTable();
contact.setName("Deepak");
session.save(contact);
tx.commit();
System.out.println("Done");
} catch (Exception e) {
System.out.println(e.getMessage());
} finally {
session.flush();
session.close();
}
}
}


3)
<?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.TestTable" table="TEST">
<id name="id" type="int" column="ID" >
<generator class="assigned"/>
</id>
<property name="FirstName">
<column name="NAME" />
</property>
</class>
<class name="roseindia.tutorial.hibernate.NameTable" table="NAMETABLE">

<property name="name">
<column name="NAME" />
</property>
</class>
</hibernate-mapping>


4)
<?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:3309/hibernatetutorial</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">admin</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="test.hbm.xml"/>
</session-factory>
</hibernate-configuration>