my dispatcher-servlet.xml is
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schem...-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schem...ontext-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
<mvc:annotation-driven />
<context:component-scan base-package="com.controllers" />
<bean id="viewResolver" class="org.springframework.web.servlet.view.Intern alResourceViewResolver" >
<property name="viewClass" value="org.springframework.web.servlet.view.JstlVi ew" />
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>

<bean id="myDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/sravan"/>
<property name="username" value="root"/>
<property name="password" value="root"/>
</bean>
<bean class="org.springframework.web.servlet.mvc.annotat ion.DefaultAnnotationHandlerMapping" >
<property name="order"><value>1</value></property>
<property name="interceptors">
<list>
<ref bean="themeChangeInterceptor" />
<ref bean="localeChangeInterceptor" />
</list>
</property>


</bean>

<bean class="org.springframework.web.servlet.mvc.annotat ion.AnnotationMethodHandlerAdapter" />

<bean id="mySessionFactory" class="org.springframework.orm.hibernate3.annotati on.AnnotationSessionFactoryBean">
<property name="dataSource" ref="myDataSource" />
<property name="annotatedClasses">
<list>
<value>com.beans.Contact</value>
<value>com.beans.Upload</value>
<value>com.beans.ContactPerson</value>
<value>com.beans.Sequence</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect"> org.hibernate.dialect.MySQLDialect</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.hbm2ddl.auto">update</prop>
</props>
</property>
</bean>
<bean id="validator" class="com.validator.ContactFormValidator" >
<property name="sessionFactory" ref="mySessionFactory"></property>
</bean>
<bean id="contactsDAO" class="com.dao.ContactsDAO">
<property name="sessionFactory" ref="mySessionFactory"></property>
</bean>
<bean id="task" class="com.schedule.SyncWorker" />
<bean name="jobDetailBean" class="org.springframework.scheduling.quartz.JobDe tailBean" p:jobClass="com.schedule.CustomJob" >
<property name="jobDataAsMap">
<map>
<entry key="worker" >
<ref bean="task" />
</entry>
</map>
</property>
</bean>
<bean id="cronTrigger" class="org.springframework.scheduling.quartz.CronT riggerBean" p:jobDetail-ref="jobDetailBean" p:startDelay="10000" p:cronExpression="0/10 * * * * ?" />
<bean class="org.springframework.scheduling.quartz.Sched ulerFactoryBean" p:waitForJobsToCompleteOnShutdown="true" >
<property name="triggers">
<list>
<ref bean="cronTrigger" />
</list>
</property>
</bean>
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.C ommonsMultipartResolver">
<property name="maxUploadSize" value="100000"/>
</bean>
<bean id="themeSource"
class="org.springframework.ui.context.support.Reso urceBundleThemeSource">
<property name="basenamePrefix" value="theme-" />
</bean>
<bean id="themeChangeInterceptor"
class="com.themes.ThemeChange">
<property name="paramName" value="theme" />
</bean>
<bean id="themeResolver"
class="com.themes.ThemeResolver">
<property name="defaultThemeName" value="default" />
</bean>
<bean id="localeChangeInterceptor"
class="org.springframework.web.servlet.i18n.Locale ChangeInterceptor">
<property name="paramName" value="lang" />
</bean>
<bean id="localeResolver"
class="org.springframework.web.servlet.i18n.Cookie LocaleResolver">
<property name="defaultLocale" value="en"/>
</bean>
<bean id="messageSource"
class="org.springframework.context.support.Reloada bleResourceBundleMessageSource">
<property name="basename" value="classpath:messages" />
<property name="defaultEncoding" value="UTF-8"/>
</bean>
</beans>




and i created a class for generating sequence number. and the class is

package com.generator;

import java.io.Serializable;

import org.hibernate.HibernateException;
import org.hibernate.SessionFactory;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.id.IdentifierGenerator;
import org.springframework.beans.factory.annotation.Autow ired;

import com.beans.Sequence;

public class CustomerId implements IdentifierGenerator {
@Autowired
private SessionFactory mySessionFactory;
int number=0;
public Serializable generate(SessionImplementor arg0, Object arg1)throws HibernateException {
// TODO Auto-generated method stub
Sequence sequence=null;
System.out.println("sessionFactory "+mySessionFactory);
sequence = (Sequence)mySessionFactory.openSession().get(Seque nce.class,"Contact");
int lastNo=sequence.getLastNo();
System.out.println("lastNo "+lastNo);
sequence.setLastNo(lastNo+1);
mySessionFactory.openSession().update(sequence);
return lastNo;

}

}

and when run this application mySessionFactory is showing as null.

Please help me.
thanx in advance.