problem with hibernate

Hello guys
I'm working a hibernate application to insert student details in the database.But it it giving exception as

Exception:
javax.servlet.ServletException: Error instantiating servlet class InsertStudent

RootCause:
java.lang.NoClassDefFoundError: org/hibernate/Session

can anyone please help me.

Are hibernate jars present in your classpath of the application?

Everything is perfect but still it is giving same problem
Is there any other solution for this.

Originally posted by kishore nerella:
Everything is perfect but still it is giving same problem
Is there any other solution for this.

No. You need to make sure the Hibernate jars are in your application's classpath. A java.lang.NoClassDefFoundError occurs when the class loader tries to load a class it cannot find. Where have you put the Hibernate jar files?

This problem is really killing me.
can you please check out all the programs i have written and find the error.

Student.jsp
<html>
<body>
<center><h2>Student Insertion Form</h2></center>
<form action="StudentInsert">
<table>
<tr>
<td>
Student No:
</td>
<td>
<input type="text" name="sno">
</td>
</tr>
<tr>
<td>
Student Name:
</td>
<td>
<input type="text" name="sname">
</td>
</tr>
<tr>
<td>
Student Email:
</td>
<td>
<input type="text" name="email">
</td>
</tr>
<tr>
<td>
Student Mobile:
</td>
<td>
<input type="text" name="mobile">
</td>
</tr>
<tr>
<td>
<input type="submit" value="Insert">
</td>
</tr>
</table>
</form>
</body>
</html>

web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>
InsertStudent</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>

<servlet>
<servlet-name>InsertServlet</servlet-name>
<servlet-class>InsertStudent</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>InsertServlet</servlet-name>
<url-pattern>/StudentInsert</url-pattern>
</servlet-mapping>
</web-app>

hibernate.cfg.xml
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
<session-factory>

<property name="connection.url">jdbc

dbc:kishdsn</property>
<property name="connection.username">scott</property>
<property name="connection.password">tiger</property>
<property name="connection.driver_class">sun.jdbc.odbc.JdbcOdbcDriver</property>
<property name="dialect">org.hibernate.dialect.OracleDialect</property>

<mapping resource="stud/student.hbm.xml" />
</session-factory>
</hibernate-configuration>

student.hbm.xml
<?xml version="1.0" encoding='UTF-8'?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
<hibernate-mapping package="stud">
<class name="Student" table="student">
<id name="sno" column="sno" type="java.lang.Integer">
<generator class="assigned"/>
</id>
<property name="sname" column="sname" type="java.lang.String" />
<property name="email" column="email" type="java.lang.String" />
<property name="mobile" column="mobile" type="java.lang.Integer"/>
</class>
</hibernate-mapping>

student.java

import java.io.Serializable;

public class Student implements Serializable
{
private int sno,mobile;
private String sname,email;

public Student()
{

}

public void setSno(int sno)
{
this.sno=sno;
}
public void setSname(String sname)
{
this.sname=sname;
}
public void setEmail(String email)
{
this.email=email;
}
public void setMobile(int mobile)
{
this.mobile=mobile;
}

public int getSno()
{
return this.sno;
}
public String getSname()
{
return this.sname;
}
public String getEmail()
{
return this.email;
}
public int getMobile()
{
return this.mobile;
}

}

InsertStudent.java
import org.hibernate.*;
import org.hibernate.cfg.*;
public class InsertStudent
{
public static void main(String args[]) throws Exception
{
Configuration c=new Configuration();
c.configure("hibernate.cfg.xml");
SessionFactory sf=c.buildSessionFactory();
Session s=sf.openSession();
Transaction tx=s.beginTransaction();

Student sb=new Student();

sb.setSno(Integer.parseInt(args[0]));
sb.setSname(args[1]);
sb.setEmail(args[2]);
sb.setMobile(Integer.parseInt(args[3]));

s.save(sb);
s.flush();
tx.commit();
System.out.println("Record inserted");
s.close();
}
}

Check if you have hibernate.jar file in the lib directory!

The error is not related to any code or mapping or xml files that you have, it is just that the jar file is not in the classpath.

Mark