spring security 重复登陆了

package com.nroad.heartserver.model;

import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;

import javax.persistence.*;
import java.sql.Timestamp;
import java.util.Collection;

/**
 * Operator entity. @author MyEclipse Persistence Tools
 */
@Entity
@Table(name = "operator", schema = "heart_server")
public class Operator implements UserDetails {
    // Property accessors
    @Id
    @Column(unique = true, nullable = false, length = 32)
    private String username;

    @Column(length = 32)
    @Enumerated(EnumType.STRING)
    private ROLE role;

    @Column(length = 32)
    private String password;

    @Column(length = 8)
    private String addPerson;

    @Column( length = 23)
    private Timestamp addDate;

    // Constructors

    /**
     * default constructor
     */
    public Operator() {
    }

    /**
     * minimal constructor
     */
    public Operator(String username) {
        this.username = username;
    }

    /**
     * full constructor
     */
    public Operator(String username, ROLE role, String password, String addPerson, Timestamp addDate) {
        this.username = username;
        this.role = role;
        this.password = password;
        this.addPerson = addPerson;
        this.addDate = addDate;
    }
    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public ROLE getRole() {
        return role;
    }

    public void setRole(ROLE role) {
        this.role = role;
    }

    @Override
    public Collection getAuthorities() {
        return null;
    }

    public String getPassword() {
        return this.password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getAddPerson() {
        return this.addPerson;
    }

    public void setAddPerson(String addPerson) {
        this.addPerson = addPerson;
    }

    public Timestamp getAddDate() {
        return this.addDate;
    }

    public void setAddDate(Timestamp addDate) {
        this.addDate = addDate;
    }

    /**
     * Returns {@code true} if the supplied object is a {@code User} instance with the
     * same {@code username} value.
     * 

     * In other words, the objects are equal if they have the same username, representing the
     * same principal.
     */
    @Override
    public boolean equals(Object rhs) {
        if (rhs instanceof Operator) {
            return username.equals(((Operator) rhs).username);
        }
        return false;
    }

    /**
     * Returns the hashcode of the {@code username}.
     */
    @Override
    public int hashCode() {
        return username.hashCode();
    }

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

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

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

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

}

package com.nroad.heartserver.config;

import com.nroad.heartserver.security.CustomUserDetailsService;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.encoding.Md5PasswordEncoder;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.web.session.HttpSessionEventPublisher;

/**
 * MyWebSecurityConfigurerAdapter
 * Created by jiyy on 2017/1/9.
 */
@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class MyWebSecurityConfigurerAdapter extends WebSecurityConfigurerAdapter {

    @Override
    @Bean
    protected UserDetailsService userDetailsService() {
        return new CustomUserDetailsService();
    }

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(userDetailsService()).passwordEncoder( new Md5PasswordEncoder());
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.headers().frameOptions().sameOrigin();//set X-Frame-Options
        http.csrf().disable();//set csrf
        http
                .authorizeRequests()//验证请求每个macher按照他们的声明顺序执行
                    .antMatchers("/**","/","/heartserver")//resources and  main server url
                    .permitAll()
                .anyRequest().authenticated()
                .and()
                .formLogin()
                    .usernameParameter("username") // default is username
                    .passwordParameter("password") // default is password
                    .loginPage("/heartserver") // default is /login with an HTTP get
                    .loginProcessingUrl("/login") // default is /login ,here use security default
                    .successForwardUrl("/after-login")
                    .permitAll()
                .and()
                .logout()
                    .invalidateHttpSession(true)
                    .deleteCookies("JSESSIONID")
                    .permitAll()
                .and()
                .sessionManagement()
                    .invalidSessionUrl("/heartserver")
                    .maximumSessions(1)//防止用户多次登录
                    .expiredUrl("/heartserver")
                    .and()
                .and()
                .httpBasic();
    }

    @Bean
    public HttpSessionEventPublisher httpSessionEventPublisher() {
        return new HttpSessionEventPublisher();
    }
}

设置了单点登陆，但还是能登陆。求大神指导