java - HTTP Status 500 - Servlet.init() for servlet spring threw exception here is my code -

controller,service , dao in different package userser interface , userservice class on package com.service userda interface , userdao class on package com.dao , controller on package com.controller please me , if doing on same package working different package not working

thankyou

@controller public class usercontroller { @autowired public userser userser; @requestmapping(value="/get") public  void dummytest() {            system.out.println(userser.sayhii()); } }  @service("userser") public class userservice  implements userser{ @autowired public  userda userda;   public string sayhii() { return userda.say(); } } @repository("userda") public class userdao implements userda { public string say() { return "hiiiiiiiiiiiii"; } }      web.xml    * <servlet>             <servlet-name>spring</servlet-name>             <servlet-class>                 org.springframework.web.servlet.dispatcherservlet             </servlet-class>             <load-on-startup>1</load-on-startup>         </servlet>         <servlet-mapping>             <servlet-name>spring</servlet-name>             <url-pattern>/</url-pattern>         </servlet-mapping>* spring-servlet.xml *<?xml version="1.0" encoding="utf-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:ctx="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemalocation="http://www.springframework.org/schema/beans  http://www.springframework.org/schema/beans/spring-beans-2.5.xsd  http://www.springframework.org/schema/mvc  http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd  http://www.springframework.org/schema/context  http://www.springframework.org/schema/context/spring-context-2.5.xsd "> <ctx:annotation-config></ctx:annotation-config> <mvc:annotation-driven/> <ctx:component-scan base-package="com.controller"></ctx:component-scan> <bean class="org.springframework.web.servlet.mvc.annotation.defaultannotationhandlermapping" /> <bean class="org.springframework.web.servlet.mvc.annotation.annotationmethodhandleradapter" />   <bean class="org.springframework.web.servlet.view.internalresourceviewresolver">         <property name="prefix" value="/web-inf/views/" />         <property name="suffix" value=".jsp" />     </bean> </bean>*