I can not get the session which i had set

i set session in my service,and i can get it in service,when calling in controller,it does not work.. my service

@Transactional
public boolean loginCheck(String userName, String password) {
    boolean rtn = false;
    log.debug(userName);

    if (!StringUtils.isEmpty(userName)) {
        User loginUser = template.lookup(User.class, "login", userName).to(User.class).singleOrNull();

        if (loginUser != null) {

            String userPassword = loginUser.getPassword();

            if (new Md5PasswordEncoder().encodePassword(password, User.SALT).equals(userPassword)) {

                rtn = true;
                setUserInSession(loginUser);
                log.debug( "====== loginCheck getUserFromSession ===="+getUserFromSession());
            }
        }
    } else {
        log.warn("you must input user name");
    }

    return rtn;

}
private void setUserInSession(User user) {
    SecurityContext context = SecurityContextHolder.getContext();
    MovieUserDetails userDetails = new MovieUserDetails(user);
    UsernamePasswordAuthenticationToken authentication = new UsernamePasswordAuthenticationToken(userDetails,
            user.getPassword(), userDetails.getAuthorities());
    context.setAuthentication(authentication);
}
public User getUserFromSession() {
    SecurityContext context = SecurityContextHolder.getContext();
    Authentication authentication = context.getAuthentication();
    Object principal = authentication.getPrincipal();

    if (principal instanceof MovieUserDetails) {
        MovieUserDetails userDetails = (MovieUserDetails) principal;
        return userDetails.getUser();
    }
    return null;
}

MovieUserDetails public class MovieUserDetails implements UserDetails { private final User user;

public MovieUserDetails(User user) {
    this.user = user;
}

@Override
public Collection<GrantedAuthority> getAuthorities() {
    User.Roles[] roles = user.getRole();
    if (roles == null)
        return Collections.emptyList();
    return Arrays.<GrantedAuthority> asList(roles);
}

@Override
public String getPassword() {
    return user.getPassword();
}

@Override
public String getUsername() {
    return user.getLogin();
}

@Override
public boolean isAccountNonExpired() {
    return true;
}

@Override
public boolean isAccountNonLocked() {
    return true;
}

@Override
public boolean isCredentialsNonExpired() {
    return true;
}

@Override
public boolean isEnabled() {
    return true;
}

public User getUser() {
    return user;
}

}

my controller

@RequestMapping(value = "/user", method = RequestMethod.GET)
public String profile(Model model) {

    final User user = populator.getUserFromSession();
    model.addAttribute("user", user);
    if (user != null) {
        model.addAttribute("recommendations", movieRepository.getRecommendations(user));
    }
    return "user/index";
}

error info

java.lang.NullPointerException: null
at com.oberon.fm.neo4j.service.DatabasePopulator.getUserFromSession(DatabasePopulator.java:120) ~[DatabasePopulator.class:na]
at com.oberon.fm.neo4j.service.DatabasePopulator$$FastClassBySpringCGLIB$$c9138765.invoke(<generated>) ~[spring-core-4.1.5.RELEASE.jar:na]
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) ~[spring-core-4.1.5.RELEASE.jar:4.1.5.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:649) ~[spring-aop-4.1.5.RELEASE.jar:4.1.5.RELEASE]
at com.oberon.fm.neo4j.service.DatabasePopulator$$EnhancerBySpringCGLIB$$8a821ccd.getUserFromSession(<generated>) ~[spring-core-4.1.5.RELEASE.jar:na]
at com.oberon.fm.controller.UserController.profile(UserController.java:34) ~[UserController.class:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_05]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_05]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_05]
at java.lang.reflect.Method.invoke(Method.java:483) ~[na:1.8.0_05]
at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:177) ~[spring-web-4.1.5.RELEASE.jar:4.1.5.RELEASE]
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:446) ~[spring-webmvc-4.1.5.RELEASE.jar:4.1.5.RELEASE]
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:434) ~[spring-webmvc-4.1.5.RELEASE.jar:4.1.5.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943) ~[spring-webmvc-4.1.5.RELEASE.jar:4.1.5.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877) ~[spring-webmvc-4.1.5.RELEASE.jar:4.1.5.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966) [spring-webmvc-4.1.5.RELEASE.jar:4.1.5.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857) [spring-webmvc-4.1.5.RELEASE.jar:4.1.5.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:618) [servlet-api.jar:na]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842) [spring-webmvc-4.1.5.RELEASE.jar:4.1.5.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725) [servlet-api.jar:na]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) [catalina.jar:8.0.15]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.15]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat-websocket.jar:8.0.15]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [catalina.jar:8.0.15]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.15]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) [spring-web-4.1.5.RELEASE.jar:4.1.5.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.1.5.RELEASE.jar:4.1.5.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [catalina.jar:8.0.15]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.15]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) [catalina.jar:8.0.15]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) [catalina.jar:8.0.15]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) [catalina.jar:8.0.15]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) [catalina.jar:8.0.15]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [catalina.jar:8.0.15]
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610) [catalina.jar:8.0.15]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) [catalina.jar:8.0.15]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:537) [catalina.jar:8.0.15]
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1085) [tomcat-coyote.jar:8.0.15]
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658) [tomcat-coyote.jar:8.0.15]
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222) [tomcat-coyote.jar:8.0.15]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1556) [tomcat-coyote.jar:8.0.15]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1513) [tomcat-coyote.jar:8.0.15]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_05]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_05]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-util.jar:8.0.15]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_05]
Apr 09, 2015 4:10:34 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [context] in context with path [/Web] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause

i login a user (micha/password),then setSession and gan get in inservice16:10:33.493 [http-nio-8080-exec-3] DEBUG c.o.f.n.service.DatabasePopulator - ====== loginCheck getUserFromSession ====Micha (micha)but i want use it in another webpage,i can not get the session and throw exception,this(DatabasePopulator.java:120isObject principal = authentication.getPrincipal();if you have some ideas,tell me.i am very apperaicated! ^~^..