spring mvc - NullPointerexception in getting session -

i getting following exception.its due line

session  ss=session.getcurrentsession();  java.lang.nullpointerexception     @ com.mkyong.common.dao.userdao.saveuser(userdao.java:25)     @ com.mkyong.common.controller.jsoncontroller.getshopinjson(jsoncontroller.java:31)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:57)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:601)     @ org.springframework.web.bind.annotation.support.handlermethodinvoker.invokehandlermethod(handlermethodinvoker.java:176)     @ org.springframework.web.servlet.mvc.annotation.annotationmethodhandleradapter.invokehandlermethod(annotationmethodhandleradapter.java:426)     @ org.springframework.web.servlet.mvc.annotation.annotationmethodhandleradapter.handle(annotationmethodhandleradapter.java:414)     @ org.springframework.web.servlet.dispatcherservlet.dodispatch(dispatcherservlet.java:790)     @ org.springframework.web.servlet.dispatcherservlet.doservice(dispatcherservlet.java:719)     @ org.springframework.web.servlet.frameworkservlet.processrequest(frameworkservlet.java:644)     @ org.springframework.web.servlet.frameworkservlet.dopost(frameworkservlet.java:560)     @ javax.servlet.http.httpservlet.service(httpservlet.java:647)     @ javax.servlet.http.httpservlet.service(httpservlet.java:728)     @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:305)     @ org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:210)     @ org.apache.catalina.core.standardwrappervalve.invoke(standardwrappervalve.java:222)     @ org.apache.catalina.core.standardcontextvalve.invoke(standardcontextvalve.java:123)     @ org.apache.catalina.authenticator.authenticatorbase.invoke(authenticatorbase.java:472)     @ org.apache.catalina.core.standardhostvalve.invoke(standardhostvalve.java:171)     @ org.apache.catalina.valves.errorreportvalve.invoke(errorreportvalve.java:99)     @ org.apache.catalina.valves.accesslogvalve.invoke(accesslogvalve.java:936)     @ org.apache.catalina.core.standardenginevalve.invoke(standardenginevalve.java:118)     @ org.apache.catalina.connector.coyoteadapter.service(coyoteadapter.java:407)     @ org.apache.coyote.http11.abstracthttp11processor.process(abstracthttp11processor.java:1004)     @ org.apache.coyote.abstractprotocol$abstractconnectionhandler.process(abstractprotocol.java:589)     @ org.apache.tomcat.util.net.jioendpoint$socketprocessor.run(jioendpoint.java:310)     @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1145)     @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:615)     @ java.lang.thread.run(thread.java:722)

my dao class follows.

 package com.mkyong.common.dao; import org.hibernate.sessionfactory; import org.hibernate.session; import com.mkyong.common.model.user;  import org.springframework.beans.factory.annotation.autowired; import org.springframework.stereotype.repository;  public class userdao {      private sessionfactory session;      public void setsessionfactory(sessionfactory session){         if(session == null){          throw new illegalstateexception();         }         this.session=session;     }       public int saveuser(user user) {          session  ss=session.getcurrentsession();         system.out.println(user.getusername());         system.out.println(user.getpassword());         //session ss=session.getcurrentsession();         ss.save(user);            return 1;     }   } 

my config file follows:

<beans xmlns="http://www.springframework.org/schema/beans"     xmlns:context="http://www.springframework.org/schema/context"     xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"     xmlns:tx="http://www.springframework.org/schema/tx"     xsi:schemalocation="         http://www.springframework.org/schema/beans              http://www.springframework.org/schema/beans/spring-beans-3.0.xsd         http://www.springframework.org/schema/context          http://www.springframework.org/schema/context/spring-context-3.0.xsd         http://www.springframework.org/schema/mvc         http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd         http://www.springframework.org/schema/tx         http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">     <context:property-placeholder location="classpath:jdbc.properties" />     <context:component-scan base-package="com.mkyong.common.controller" />     <context:annotation-config/>          <mvc:annotation-driven />          <bean id="datasource"         class="org.springframework.jdbc.datasource.drivermanagerdatasource">         <property name="driverclassname" value="${database.driver}" />         <property name="url" value="${database.url}" />         <property name="username" value="${database.user}" />         <property name="password" value="${database.password}" />     </bean>       <bean id="sessionfactory"         class="org.springframework.orm.hibernate3.annotation.annotationsessionfactorybean">         <property name="datasource" ref="datasource" />           <property name="annotatedclasses">             <list>                 <value>com.mkyong.common.model.user</value>             </list>         </property>         <property name="hibernateproperties">             <props>                 <prop key="hibernate.dialect">${hibernate.dialect}</prop>                 <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>             </props>         </property>     </bean>     <bean id="hibernatetransactionmanager" class="org.springframework.orm.hibernate3.hibernatetransactionmanager">         <property name="sessionfactory" ref="sessionfactory" />     </bean>    </beans> 

your session null.you using getcurrentsession on null .so getting nullpointeexception here