Unable to access links that are mapped in admin Controller even after successful authentication and it is showing 404 error - spring

Question

I am working on a E commerce project in which I use spring security for authentication of users. Actually the project is working fine but when I login as an admin, it show me that I am successful authentication as admin and when I click on the links whose request mapping is in admin controller it show me 404 error ,page is unable to find.
WEB.XML
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id="WebApp_ID">
<display-name>Archetype Created Web Application</display-name>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
/WEB-INF/dispatcher-servlet.xml
</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- SPRING SECURITY CONFUGRATION -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
/WEB-INF/spring-security.xml
</param-value>
</context-param>
<listener>
<listener-class>org.springframework.security.web.session.HttpSessionEventPublisher</listener-class>
</listener>
<filter>
<filter-name>springSecurityFilterChain</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
<filter-mapping>
<filter-name>springSecurityFilterChain</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
spring-security.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:security="http://www.springframework.org/schema/security"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/security
http://www.springframework.org/schema/security/spring-security.xsd">
<context:component-scan base-package="com.**" />
<security:http auto-config="true" >
<security:intercept-url pattern="/webapp/resources/**" access="permitAll"/>
<security:intercept-url pattern="/login" access="permitAll"/>
<security:intercept-url pattern="/admin/**" access="hasRole('ROLE_ADMIN')"/>
<security:intercept-url pattern="/user/**" access="permitAll"/>
<security:form-login
login-page="/login"
username-parameter="username"
password-parameter="password"
authentication-success-forward-url="/userLogged"/>
<security:access-denied-handler
error-page="/error"/>
<security:csrf disabled="true"/>
<security:logout
logout-url="/logout"
invalidate-session="true"
logout-success-url="/" />
</security:http>
<security:authentication-manager>
<security:authentication-provider>
<security:jdbc-user-service
data-source-ref="dataSource"
users-by-username-query="select email, password, 'TRUE' as enabled from user where email=?"
authorities-by-username-query="select email, role from user where email=?"
/>
</security:authentication-provider>
</security:authentication-manager>
Admin Controller
#RequestMapping("/admin")
#Controller
public class adminController {
#RequestMapping("/insert")
public ModelAndView insertPage(){
ModelAndView mav =new ModelAndView("insert");
return mav;
}
}
Login Page
<form id="form" action="${pageContext.request.contextPath}/login" method="post" class="modal-content animate">
<div class="imgcontainer">
<img src="<c:url value="/resources/img/profile.png"/>"
alt="Avatar" class="avatar">
</div>
<div class="formcontainer">
<label><b>Username</b></label> <input type="text"
placeholder="Enter Username" name="username" required> <label><b>Password</b></label>
<input type="password" placeholder="Enter Password"
name="password" required>
<button type="submit">Login</button>
<input type="checkbox" checked="checked"> Remember me
</div>
<div class="formcontainer" style="background-color: #f1f1f1">
<button type="button"
onclick="document.getElementById('id01').style.display='none'"
class="cancelbtn">Cancel</button>
<span class="psw">Forgot password?</span>
</div>
</form>
Error screenshot